W&T Com-Server++, Com-Server 3x Isolated, 58665, 58664, 58662 User Manual

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Manual

Com-Server++ Com-Server 3x Isolated

Release 2.08, November 2015

Typ 58665, 58662 Firmware 1.35 or higher SN 2283238 or higher

W&T

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W&T

Microsoft, MS-DOS, Windows, Winsock and Visual Basic

are registered trademarks of the Microsoft Corporation.

ST is a registered trademark of AT&T Lightguide Cable Connectors.

Subject to error and alteration: Since it is posssible that we make mistakes, you mustn’t use any of our statements without veriﬁcation. Please, inform us of any error or misunderstanding you come about, so we can identify and eliminate it as soon as possible.

Carry out your work on or with W&T products only to the extent that they are described here and after you have completely read and understood the manual or guide. We are not liable for unauthorized repairs or tampering. When in doubt, check ﬁrst with us or with your dealer.

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Introduction

The Com-Server++, 58665 and Com-Server 3x Isolated, 58662 represent a uniform platform for linking serial interfaces such as RS232, RS422/485 to TCP/IP networks. The standard modes for transparent tunneling of serial data (e.g. through virtual COM ports) are implemented. The Com-Server++ includes additional protocols and modes (e.g. UDP, TCP client, FTP client/server, etc.) as well as expanded functions for structuring the data interchange.

In addition to all the standard applications implemented in the ﬁrmware, this reference manual also describes the integration possibilities for your own applications.

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Content

1 Quickstart �� 9

1.1 Flow chart – Network installation using WuTility ............... 10

1.2 Overview of conﬁguration menu ...................................... 11

1.3 Factory defauls settings ................................................... 12

2 Assigning the IP address �� 13

2.1 Conﬁguring network parameters with WuTility ................. 14

2.2 Assigning the IP using DHCP protocol .............................. 17

2.2.1 Manual activation of DHCP ..........................................17

2.2.2 System name ..............................................................18

2.2.3 Lease time ..................................................................18

2.2.4 Reserved IP addresses .................................................19

2.4.5 Dynamic IP addresses .................................................19

2.3 Assigning the IP using the ARP command ........................ 20

2.4 Assigning the IP using the serial port ............................... 23

2.5 IP Address Conﬂict Detect ................................................ 25

3 Supply voltage �� 27

3.1 Supply voltage 58665 ...................................................... 28

3.1.1 Power over Ethernet ....................................................28

3.1.2 External supply ...........................................................28

3.1 Supply voltage 58662 ...................................................... 29

4 Network interface �� 31

4.1 Ethernet interface ............................................................ 32

5 The serial combi-port �� 35

5.1 Overview .......................................................................... 36

5.1.1 Opening the Com-Server .............................................36

5.1.2 Mode selection ...........................................................36

5.2 RS232 mode (factory default) ........................................... 37

5.3 RS422/485 mode ............................................................. 38

6 LED displays �� 41

6.1 LED displays .................................................................... 42

7 Conﬁguration access to the Com-Server �� 45

7.1 Conﬁguration menu structure .......................................... 46

7.2 Conﬁguration via Telnet................................................... 48

7.2.1 Navigation within the Telnet menu ..............................48

7.3 Conﬁguration via Browser - Web Based Management ........ 50

7.3.1 Activating WBM with the WuTility-Tool ........................50

7.3.2 Activating WBM via the serial interface ........................50

7.3.3 Activating WBM from the conﬁguration menu..............51

7.3.4 Starting and navigating the WBM .................................52

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8 The basis conﬁguration of the Com-Server �� 55

8.1 Save your settings ............................................................56

8.2 Menu: INFO System

8.3 Menu: SETUP System ........................................................ 58

.......................................................... 57

8.3.1 Menu: SETUP System r Setup TCP/IP...........................58

8.3.2 Menu: SETUP System r System Password ....................62

8.3.3 Menu: SETUP System r System Name

8.3.4 Menu: SETUP System r Logﬁle

8.3.5 Menu: SETUP System r Flash Update

8.3.6 Menu: SETUP System r Factory Defaults

..........................63

....................................63

...........................65

.....................65

8.3.7 Menu: SETUP System r Reset ......................................65

8.3.8 Menü: SETUP System r Link Speed

8.4 Menu ... r TCP/IP Mode r System Options ......................67

..............................65

9 Conﬁguration of the serial port �� 69

9.1 The serial parameters (Menu: UART Setup) ....................... 70

9.1.1 Baud rate, Data bits, Stop bits, Parity ..........................70

9.1.2 The handshake modes

................................................71

9.1.3 Receive Buﬀer (InQueue) .............................................75

9.1.4 FIFO Send/Rec (only Com-Server 3x Isolated) ..............75

9.2 TCP-/UDP port numbers (Menu: TCP/IP Mode) .................. 77

10 Packetizing serial datagrams �� 79

10.1 Packet Options ...............................................................80

10.1.1 Startsequence/Endsequence .....................................81

10.1.2 Startsequence + Lengthﬁeld

10.1.3 Interpacket Delay

10.1.4 Fixed Packet Length

......................................................86

..................................................87

......................................84

11 Mode TCP-Server �� 89

11.1 The Com-Server as TCP server .......................................90

11.1.1 Conﬁguration of the local port number .....................91

11.1.2 Optional settings

12 Mode TCP Client �� 95

12.1 The Com-Server as TCP client .........................................96

12.1.1 TCP client mode with ﬁxed destination system .........97

12.1.2 TCP client mode with serial addressing

12.1.3 Optional settings ....................................................102

12.1.4 Deactivating TCP client mode

12.1.5 Application: Client/Server mode

13 Data transfer per UDP �� 109

13.1 Der Com-Server als UDP-Peer .......................................110

13.1.1 Setting the local UDP port number ..........................111

13.1.2 UDP clientmode with ﬁxed destination system

13.1.3 UDP client mode serial addressing

13.1.4 Optional settings ....................................................115

......................................................91

...................100

..................................105

..............................105

........112

..........................113

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13.1.5 Deactivating UDP mode ...........................................116

14 UDP Bus Mode �� 117

14.1 Function of UDP Bus Mode ........................................... 118

14.1.3 Optional settings ....................................................120

14.1.4 Deactivating UDP mode ...........................................121

15 The Windows COM port redirector �� 123

15.1 Overview ......................................................................124

15.2 Download & installation of the W&T COM redirector ..... 125

15.2.1 Installation of the W&T COM port redirector ............125

15.2.2 Uninstalling the W&T COM Port Redirector .............126

15.3 Set up virtual COM ports .............................................. 127

15.3.1 Optional settings on the Com-Server .......................127

16 Box-to-Box mode �� 131

16.1 Box-to-Box application ................................................. 132

16.1.1 Conﬁguring Box-to-Box mode .................................133

16.1.2 Optional settings ....................................................134

16.1.3 Deactivating Box to Box Mode .................................136

17 Mode FTP-Server �� 139

17.1 The Com-Server as FTP server ...................................... 140

17.1.1 Activating FTP-Server mode .....................................140

17.1.2 Supported FTP commands and functiuons ..............141

17.1.3 Optional settings ....................................................142

18 Mode FTP-Client �� 143

18.1 The Com-Server as FTP client ....................................... 144

18.1.1 Conﬁguring the destination address port no. ..........145

18.1.3 FTP client with serial protocol .................................148

18.1.4 Closing the FTP connection .....................................150

18.1.5 Deactivating FTP client mode ..................................151

18.1.6 Application examples .............................................152

19 Mode Telnet Server �� 155

19.1 The Com-Server as Telnet server .................................. 156

19.1.1 Activating Telnet-Server mode ................................156

19.1.2 Optional Settings ....................................................157

20 Mode Telnet Client �� 159

20.1 The Com-Server as Telnet client ................................... 160

20.1.1 Destination address and port number .....................160

20.1.2 Optional settings ....................................................162

20.1.3 Deactivating Telnet client mode ..............................163

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21 Mode SLIP-Router �� 165

21.1 SLIP mode .................................................................... 166

21.1.1 Conﬁguring the SLIP mode ......................................167

21.1.2 Optional settings ....................................................169

21.1.3 Deactivating SLIP router mode ................................169

21.1.4 Application example ...............................................170

21.1.5 Conﬁguring the Com-Server via SLIP .......................171

22 OPC data transfer �� 173

22.1 Overview ......................................................................174

22.2 Download and installation of the W&T OPC server ........ 175

22.2.1 Installation of the W&T OPC server ..........................175

22.2.2 Deinstallation of the OPC server ..............................176

22.3 Conﬁguration of the OPC server ...................................177

22.3.1 Optional settings on the Com-Server .......................177

22.3.2 Incorporating Com-Server into the OPC Server ........179

22.3.3 Structuring the serial data .......................................180

22.4 Serial OPC variables .....................................................181

23 Mode InQueueCopy �� 183

23.1 InQueue Copy .............................................................. 184

23.1.2 Conﬁguring InQueueCopy .......................................185

24 Status and error messages �� 187

24.1 Menu Setup Port x r Port State .................................... 188

25 Expanded services of the Com-Server �� 191

25.1 The control port...........................................................192

25.1.1 The control structure ..............................................193

25.2 Reset Com-Server port .................................................199

25.3 Com-Server reset .........................................................200

25.4 Up-/downloading conﬁguration data

25.5 Inventory taking per UDP/8513

25.6 SNMP management ...................................................... 205

............................ 201

.................................... 203

26 Firmware-Update of the Com-Server �� 207

26.1 Where do I get the current ﬁrmware? ...........................208

26.2 Network ﬁrmware update under Windows .................... 209

Appendix �� 213

Used ports and network security .......................................... 214

Serial assignment of the IP address under Windows .............218

WuTility - Inventory and management tool ...........................222

Hardware-Reset to factory defaults.......................................223

Technical data and formfactor 58665 ..................................224

Technical data and formfactor 58662 ..................................225

Index �� 226

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Subject to error and alteration

1 Quickstart

Already experienced users of Com-Servers will ﬁnd on the two following

pages a ﬂow chart with the essential steps for start-up as well as a comple-

te overview of the conﬁguration menu. Detailed information can be found

then in the following sections.

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1�1 Flow chart – Network installation using WuTility

Network

Com-Server

Select site

Connect

supply voltage

Connect

network cable

Obtain IP

address, subnet

mask, gateway

Windows PC with TCP/IP

WuTility

installed?

yes

Start

WuTility

Select

device in

inventory list

Button:

IP address

Enter IP address,

subnet mask,

gateway

Install

WuTility with

product CD

Finish

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Packet Options

Fixed Packet Length

SETUP Port 1

SETUP Port 2

1�2 Overview of conﬁguration menu

INFO System Cable Type

SETUP System Setup TCP/IP

SETUP Port 0

SAVE Setup

Logout

To activate the new settings

always save using SAVE Setup

with Telnet or the LOGOUT

link on the web pages. In WBM

use the link Logout and click

(1)

Factory defaults are printed bold

MAC address SOFTW Date/REV HARDW Rev Run Time

System Password System Name Logfile Flash Update Factory Defaults Reset

Link Speed (Auto, 10|100BT, HD|FD)

Port State

UART Setup

TCP/IP Mode

Save!

IP-Address (0.0.0.0)

Subnet Mask

Gateway

DNS-Server MTU (560-1460)

DHCP Client

System Port List Wake-on-LAN

Keep Alive Time 30s

Retransm. Timeouts IP Address Conflict detect

Connection State Byte counter Error State Clear Port Mode Baud

Parity NONE

Data Bits

Stopbit

Handshake

Receive Buffer (InQueue): 32-4094 Bytes Send/Rec FIFO Port List

TCP Server

TCP Client

UDP Client

Telnet Server Activate yes/no

Telnet Client

FTP Server Activate yes/no FTP Client

Box to Box (TCP)

SLIP Router

InQueue Copy Local Copy Port

System Options

(1)

Standard Gateway (0.0.0.0)

Route 1 Route 2 Route 3 Route 4

Standard Baudrates Special Baud Divisor

EVEN ODD

None

Hardware Software Special

Local Port TCP/UDP Controlport TCP Telnet Port (TCP) FTP Port (TCP) Reset Port (TCP)

Activ. Packet Options Server Port

Server IP/URL Special Options

Server Port Server IP/URL Special Options

Telnet Echo

Server Port Server IP/URL Special Options

Server Port Server IP/URL

Special Options Server Port

Server IP TLS(SSL) Encryption Activ. Packet Options

Net Address SLIP-Net Routing

Accepted Copy-Slave IPs

Network Delay Flush Buffer

SPACE MARK

Destination Netmask Gateway

230,4k 153,6k 115,2k 57600 38400 19200

9600

4800

Pin: RTS Pin: DTR Pin: CTS Pin: DSR XON/XOFF XON/XOFF (Filter)

Activ. Packet Options Inactivity Timeout Connect. Timeout Disconnect Char Client: "C"+Addr Response Mode

Activ. Packet Options Client: "C"+Addr Write: "C"+Addr Disconnect Char

Disconnect Char Inactivity Timeout Serial 0d -> 0d00

Auto FTP FTP Client Login Inactivity Timeout Connect. Timeout Protocol Char

Start-/Endsequ. Startsequ. + Length Filed Interpacket Delay

2400 1200 600 300 150 110 757200 50

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1�3 Factory defauls settings

The list contains an overview of the most important settings. For many applications, such as the W&T COM Port Redirector, no additional conﬁgurations need to be made besides assigning the network base parameters. Detailed information on the respective parameters can be found in later sections of this manual.

Network settings

Hardware connection: Auto negotiating IP address: 0.0.0.0 Gateway address: 0.0.0.0 Subnet mask: 255.0.0.0 DHCP: Active

To prevent unintended address assignments or

changes, we recommend deactivating the DHCP protocol if it is not expressly used in the respective network environment.

Serial settings

Hardware connection: RS232 Baud rate: 9600 Data bits: 8 Parity: NO Stop bits: 1 Handshake: None Fifo: OFF

Conﬁguration access

Per Telnet using TCP port 1111

Network applications / Operating mode

(suitable for use with W&T COM redirector) TCP server ports, port no. A-C: 8000, 8100, 8200 Control port TCP, port no. A-C: 9094, 9194, 9294

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2 Assigning the IP address

The Com-Server is factory set to IP address 0.0.0.0. Before you can make

the entry in the Com-Server, you need to specify an IP address that is valid

for your network. Your system administrator will provide you with this. The

IP address must be unique within the network!

. ... using management tool WuTility

. ... using the ARP command

. ... using DHCP protokoll

. Assigning IP address, subnet mask and gateway address

through the serial port

. IP Address Conﬂict Detect

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2�1 Conﬁguring network parameters with WuTility

WuTility is the central inventorying and management tool for all W&T network devices. In addition to convenient assigning of the IP parameters, WuTility also provides quick access to device conﬁgurations, the ability to perform ﬁrmware updates, managing conﬁguration proﬁles, etc.

WuTility can be directly installed from the included product CD. Current versions are always available on our website at http://www.wut.de. From there you can navigate using the menu tree on the left side.

Products & Downloads r Com-Server r Software-Tools

After extracting the ZIP ﬁle you install WuTility by doubleclicking on the ﬁle wutility_***.msi. Start WuTility using

Start r All Programs r W&T Software Toolkit r WuTility

2�2�1 Applications and prerequisites

IP assignment using WuTility works regardless of the current network parameters of the Com-Server and the computer used. This means that even if the Com-Server does not have IP parameters consistent with the respective network, WuTility can be used to overwrite them. Likewise, WuTility can be used to assign any values not consistent with the network the PC is located in.

• The PC and Com-Server must be located in the same physi-

cal network. This means you cannot assign values through a router.

• Any ﬁrewalls and network security packages installed on

the PC must allow communication between WuTility and the Com-Server based on UDP broadcasts. If necessary these must be correspondingly conﬁgured or temporarily turned oﬀ.

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• If the Com-Server does not have its factory default settings and there is a system password assigned, this must be known in order to make changes using WuTility.

Step 1: Start the assignment dialog

WuTility automatically searches the local network for connected W&T network devices and creates an inventory list. This search process can be repeated manually as often as desired by clicking on the Scan button:

Within the inventory list you can identify the desired ComServer based on its MAC address. For initial installations its IP address is 0.0.0.0.

Select the Com-Server and click on the IP address button:

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Step 2: Assign the IP parameters

The Static option allows you to assign ﬁxed basic parameters while simultaneously disabling DHCP and BOOTP protocols in the Com-Server. Enter the desired values for IP address, subnet mask and gateway address in the corresponding entry ﬁelds. The DHCP option enables DHCP protocol in the ComServer, and operation with a static IP address is no longer possible (see IP Assignment using DHCP Protocol for detailed information)

If the remaining conﬁguration of the Com-Server is done using a Web browser, activate the option Web-Based-Management (WBM). If you are not using the standard HTTP port 80, change the port number to the desired value.

Clicking on the Next button assigns the network parameters to the Com-Server. After acknowledging the resulting message, all the columns in the WuTility device list are ﬁlled in with information.

If necessary, the remaining conﬁguration of the Com-Server is done using Telnet or Web-Based-Management. Click on the Telnet or Browser button.

Telnet:

Browser:

Additional information can be found in the section Conﬁgura- tion Accesses for the Com-Server.

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Subject to error and alteration

2�2 Assigning the IP using DHCP protocol

DHCP protocol is activated by the factory default settings, so that in network environments dynamic IP assignment is suﬃcient for connecting the Com-Server to the network. The following parameters can be assigned using DHCP:

• IP address

• Subnet mask

• Gateway address

2�2�1 Manual activation of DHCP

To prevent unintended address assignments or address changes, DHCP protocol is automatically deactivated when using all other methods for assigning the IP parameters. The following methods are then available for later activation of DHCP.

• Management-Tool WuTility

Select the desired Com-Server from the device list and click on the IP Address button. In the following dialog check the option DHCP and then click on Next.

• Telnet-/WBM conﬁguration

In the menu branch SETUP System r Setup TCP/IP r DHCP Client you can activate DHCP protocol. For detailed information, see the section Menu: SETUP System.

A set static IP address is deleted after DHCP is

activated and the associated automatic reset. The ComServer automatically sets this to 0.0.0.0 and starts sending DHCP requests.

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2�2�2 System name

To support any automatic updating of the DNS system by the DHCP server, the Com-Server identiﬁes itself within the DHCP protocol with its system name. The factory default setting for this is COMSERVER- followed by the last three places of the Ethernet address. For example the factory set system name of a Com-Server with the Ethernet address 00:c0:3d:01:02:03 is COMSERVER-010203. The system name of the Com-Server can be changed in the conﬁguration. For additional information refer to the section Menu: SETUP System r System Name.

2�2�3 Lease time

The lease time determined and transmitted by the DHCP server speciﬁes the Time-To-Live of the assigned IP address. After half the lease time has expired, the Com-Server attempts to extend the time for the assigned DHCP server and up update the address. If this is not possible by the time the lease time expires, for example because the DHCP server can no longer be reached, the Com-Server deletes the IP address and starts a new cyclical search for alternate DHCP servers for the purpose of assigning a new IP address.

Because of the absent clock, the lease time associated with the current IP address is no longer available after a reset. After the restart therefore a corresponding update request is issued with the original DHCP server. If the latter is not resolvable at this point in time, the Com-Server deletes the IP address and starts a new cyclical search for alternate DHCP servers.

If DHCP is activated, the remaining lease time together with the current IP address is displayed in the menu item SE- TUP System r Setup TCP/IP r IP-Address using the format hh:mm:ss.

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2�2�4 Reserved IP addresses

If the Com-Server is used as a TCP server or UDP peer, it provides services which other clients in the network can also make use of as needed. To open a connection, they of course need the current IP address for the Com-Server, so that in such situations it makes sense to reserve a particular IP address for the Com-Server on the DHCP server. This is generally done by linking the IP address to the unique Ethernet address of the Com-Server, which can be found on the sticker attached to the housing.

EN = 00c0:3d01:0203 5xxxx [TB number and/or model name]

OK +0123456789

Ethernet address

2�4�5 Dynamic IP addresses

Fully dynamic address assignment, whereby the Com-Server gets a diﬀerent IP address every time it is restarted or after the lease time has expired, only makes sense in network environments with automatic cross-connection between the DHCP and DNS services. This means when a new IP address is assigned to the Com-Server, the DHCP server then automatically updates the DNS system as well. The new address is associated with the respective domain name. If in doubt, consult your system administrator for detailed information about your network environment.

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2�3 Assigning the IP using the ARP command

Requirements

This method can only be used if the Com-Server does not already have an IP address, i.e. the entry is 0.0.0.0. To change an IP address, use one of the other methods described in this section or use the conﬁguration menu over Telnet. If the Com-Server has any other value, this access is disabled.

When the factory setting is in eﬀect as well as after a manual changeover from static to DHCP, the method for assigning the IP described in this section functions only after a delay of approx. 2 minutes after a reset or after power-up.

This method does not work across networks, e.g. through routers. This means the PC and Com-Server used for assigning must be connected to the same physical network segment. Only IP addresses whose Net-ID is identical to that of the assigning computer can be assigned.

To avoid unintended changes to the IP address, the

DHCP client of the Com-Server is automatically deactiva-

ted when conﬁguring using a static ARP entry.

Step 1

Read oﬀ the

Ethernet address of the Com-Server from the stik-

ker on the side of the housing.

EN = 00c0:3d01:0203 5xxxx [TB number and/or model name]

OK +0123456789

Ethernet address

Insert a static entry into the ARP table of the computer using the following command line:

arp -s [IP address] [Ethernet address]

Older Windows systems only accept a static entry if there is a dynamic one already present. Here you should ﬁrst ping another network station.

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E.g. under Windows:

arp -s 172.16.231.10 00-C0-3D-00-12-FF

E.g under UNIX/Linux:

arp -s 172.16.231.10 00:C0:3D:00:12:FF

The IP addresses must be without leading zeros in

all Windows environments. Otherwise the entry is incorrectly interpreted by the system and an incorrect IP address is assigned to the Com-Server. In Windows Vista and newer the prompt cmd.exe necessary for invoking the ARP command must be started using Administrator rights.

Step 2

Use the following command line to ping the Com-Server with the desired IP address:

ping 10.40.21.12

The Com-Server takes the IP address of the ﬁrst network packet sent to it as its own and saves it in non-volatile memory. The ping requests of the PC are then replied.

It is not possible to conﬁgure the subnet mask and gateway address using a static ARP entry. These need to be set in a

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separate Telnet conﬁguration session (see section Basic Conﬁguration of the Com-Server).

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2�4 Assigning the IP using the serial port

After a Com-Server reset a time window of around 1-2 seconds is available on port A, during which you can assign a new IP address, subnet mask and gateway address by entering at least 3 „x“.

In contrast to other methods described above, this serial method functions regardless of whether the Com-Server already has an IP address or not. The procedure can be repeated as often as desired. The appendix contains the detailed procedure under Windows.

Preparations/requirements

First connect the serial port A of the Com-Server to a computer. For a standard PC or laptop, you will need a crossed RS232 cable (=Null modem cable, see RS232 mode).

Any serial terminal program can be used for assigning. The following transmission parameters must be set regardless of any other settings in the Com-Server:

9600 baud, no parity, 8 data bits, 1 Stop bit, no Handshake

Start the serial conﬁguration mode

Reset the Com-Server by interrupting the power. While the Com-Server is starting up, use the terminal program to send the letter x at least three times. The COM-Server will then return the prompt IPno.+<Enter>:.

Assigning the IP settings

Use the usual format (xxx.xxx.xxx.xxx) to enter the IP address, and end the entry by pressing <Enter>. If the entry was accepted, the acknowledgement is the assigned IP address. Otherwise you will get a FAIL message followed by the last current IP address.

Together with the IP address, the subnet mask and gateway address can also be assigned serially. The entry is separated

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by commas and follows the IP address. Entering as shown in the following example will assign IP address 172.17.231.99, subnet mask 255.255.255.0 and gateway 172.17.231.52 to the Com-Server

Exampel: Assigning the IP address:

IP no.+<ENTER>: <- Com-Server

172.17.231.99 -> Com-Server

Example: Assigning IP address, Subnet mask and gateway

IP no.+<ENTER>: <- Com-Server

172.17.231.99, 255.255.255.0,172.17.231.1 -> Com-Server

Option: Activating Web Based Management (WBM)

To further conﬁgure the Com-Server you can use either Telnet protocol or an Internet browser, although only Telnet is an option in the Com-Server as shipped from the factory. You can activate Web Based Management as part of the serial IP assignment. To do this, enter +w[Portno.] directly after the IP address or address string. Here Portno. is the desired TCP port in decimal format.

Exampel 1: Assigning the IP adress and WBM on Port 80.

xxx... -> Com-Server

IP no.+<ENTER>: <- Com-Server

172.17.231.99+w80 -> Com-Server

172.17.231.99-1 <- Com-Server

Exampel 2: Assigning IP address, subnet mask, gateway and activating WBM on port 8800.

xxx... -> Com-Server

IP no.+<ENTER>: <- Com-Server

172.17.231.99,255.255.0.0,172.17.231.1+w8800 -> Com-Server

172.17.231.99,255.255.0.0,172.17.231.1+w8800 <- Com-Server

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Subject to error and alteration

2�5 IP Address Conﬂict Detect

Firmware version 1.31 and higher enables the Com-Server++ to detect and display an IP address conﬂict. This function is deactivated by default and can be activated in the following menu branch:

SETUP System

When the Com-Server is restarted there is an active check for any address conﬂicts. During normal running the monitoring is passive. Details on this functionality can be found in RFC5227, IPv4 Address Conﬂict Detection.

Indication of an address conﬂict

The Com-Server++ indicates a detected address conﬂict by rapid ﬂashing (approx. 3x/s) of the Error LED. In addition a message including the competing MAC address is generated in the Error State (Setup Port x r Port State r Error State).

When using a static IP address the conﬂict is only indicated. The Com-Server continues to use this IP address. In a DHCP environment the Com-Server informs the responsible DHCP server, resets the IP address and waits for assignment of a corrected IP address.

re inform the responsible administrator in such cases.

... Setup TCP/IP

... IP Address Conflict Detect

IP address conﬂicts generally lead to communication

problems which are diﬃcult to diagnose. Please therefo-

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W&T Assigning the IP address

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Subject to error and alteration

3 Supply voltage

. Com-Server++

. Com-Server3x Isolated

Page 28

W&T Supply voltage

3�1 Supply voltage 58665

The model 58665 can also be operated either using PoE or from an external power supply.

The current draw can be found in the technical appendix.

3�1�1 Power over Ethernet

In PoE environments (Power-over-Ethernet, IEEE802.3af) power is provided by the network infrastructure. The Com-Server supports both phantom power using data pairs 1/2 and 3/6 as well as power feed using the unused wire pairs 4/5 and 7/8.

The model 58665 is a device in PoE Power Class 1 (power consumption 0.44 to 3.84W).

3�1�2 External supply

As an alternative to PoE power supply the Com-Server can also be powered by an external power supply connected to the screw terminals on the underside of the housing. A half-wave rectiﬁer makes the input reverse polarity protected. AC or DC power may be used, whereby the following limit values must be observed:

• AC: 18Vrms (- 10%) - 30Vrms (+10%)

• DC: 12V (-10%) - 48V (+10%)

(before SN 2283238 24V (-10%) - 48V (+10%))

When powering with DC voltage polarity must be observed:

L+M

+12-48V DCGND

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W&T Supply voltage

Subject to error and alteration

3�1 Supply voltage 58662

The model 58662 Com-Server can be powered using the plugin screw terminal located on the lower section of the housing. The input is reverse polarity protected and may be used with AC or DC voltages having the following speciﬁcations:

The current draw can be found in the technical appendix.

• AC: 9Veﬀ (- 10%) - 30Veﬀ (+10%)

• DC: 12V (-10%) - 48V (+10%)

L+M

+12-48V DCGND

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W&T Supply voltage

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4 Network interface

. Ethernet interface

. 10/100BaseT autonegotiating

. Power-over-Ethernet

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W&T Network interface

4�1 Ethernet interface

The Com-Server++ incorporates an IEEE 802.3-compatible network interface.

4�1�1 Link status

The Link status is indicated on the two LEDs built into the RJ45 jack.

• Link/Activity (green)

ON indicates a valid link to a hub or switch port. The LED ﬂashes when there is data traﬃc.

• Speed (yellow)

ON indicates a 100MBit/s-link (100BaseT). OFF indicates 10MBit/s (10BaseT)

4�1�2 10/100BaseT on RJ45

The Com-Server has a network interface on a shielded RJ45 connector. The pin assignments shown below correspond to an Auto-MDI-X interface, so that the connection to the hub or switch is made using a max. 100m long shielded patch cable.

1 2 3 4 5 6 7 8

Speed Link/

Activity

The network connection is galvanically isolated with respect to the supply voltage as well as the serial interface(s) for at least 1,5kV

rms

Auto Negotiation: 10/100BaseT, Full/Half Duplex

The Com-Server is factory set to operate in Auto-Negotiation mode on the network side. The data transmission speed and duplex are automatically negotiated with the connected switch/hub and set accordingly.

In addition to the Auto-Negotiation mode, both the ComServers as well as many switches can be conﬁgured for ﬁxed

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W&T Network interface

Subject to error and alteration

transmission parameters with respect to speed and duplex. To prevent communications problems (duplex mismatch), only the following two combinations are permissible:

• Both parties (switch and Com-Server) are operated in Auto-

Negotiation mode.

• Both parties are conﬁgured for the same (ﬁxed) transmissi-

on speeds and duplex mode.

Use menu sequence Setup System r Link Speed to switch between Auto-Negotiation and ﬁxed transmission speeds/ duplex mode.

Power-over-Ethernet - PoE

The Com-Server++ can obtain power as defined in IEEE802.3af/Power-over-Ethernet. Either the data pairs or the unused wire pairs in 10/100BaseT may be used (see also the section Supply Voltage).

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W&T Network interface

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5 The serial combi-port

. Mode selection

. RS232 mode

. RS422/485 mode

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W&T The serial combi-port

5�1 Overview

Com-Server comes standard with an RS232/422/485 combiport whose modes are described below.

All external signal lines use ESD-immune interface components to provide protection against static discharges of up to 15kV per IEC 801-2, Level 4.

5�1�1 Opening the Com-Server

To open the Com-Server, plug the DB9 connector into the serial port. After tightening the two mounting screws, pull on the DB9 plug to remove the circuit board from the housing..

5�1�2 Mode selection

Switching between the modes is accomplished using the internal DIL switches located on the respective interface module. The following table shows an overview of all modes:

Mode SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW8

RS232 (*) OFF OFF OFF OFF OFF OFF OFF ON

RS422, RS485 4-wire-bus-master

RS485 4-wire automatic control

RS485 2-wire automatic control

(*) Factory default

OFF OFF OFF OFF ON Term. OFF

OFF ON OFF OFF ON Term. OFF

ON ON OFF OFF OFF Term. OFF

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W&T The serial combi-port

Subject to error and alteration

5�2 RS232 mode (factory default)

The pin conﬁguration of the RS232 port is identical to that of a PC, which allows you to use standard cables.

DIP switch setting RS232

Mode SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW8

RS232 OFF OFF OFF OFF OFF OFF OFF ON

The terminating DIL switches SW6 and SW7 must

never be in the ON position when using the module in

RS232 mode. This will result in a signiﬁcant increase in the current draw and may cause the RS232 driver to fail.

Pin assignment and function RS232, D9 male

Pin Direction Signal Description Default Function (*)

1 IN DCD Data Carrier

2 IN RxD Receive Data Data in

3 OUT TxD Transmit Data Data out

4 OUT DTR Data Terminal

5 --- GND Signal Ground ---

6 IN DSR Data Set Ready Ignored

7 OUT RTS Ready To Send Handshake output

8 IN CTS Clear To Send Data output only if +3...12V

9 IN RI Ring Indicator Ignored

(*) Applies only to the hardware handshake setting

Detect

Ready

Ignored

12V for existing TCP connection to a client or server

+12V = ready to receive data

- 12V = not ready to receive data

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W&T The serial combi-port

5�3 RS422/485 mode

As opposed to RS232, an RS422 interface allows transmission distances of up to 1000 meters. The RS485 mode allows you to integrate corresponding 2- or 4-wire bus sytems into a TCP/IP network with the help of the Com-Server.

Especially when using longer cable lengths in

industrial environments, potential diﬀerences need to be taken into consideration. To prevent transmission problems and hardware damage caused by this, we recommend galvanic isolation using an external isolator (e.g. W&T RS422/485Isolator Type 66201).

DIP switch settings

Mode SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW8

RS422, RS485 4-wire bus master

RS485 4-wire automatic control

RS485 2-wire automatic control

OFF OFF OFF OFF ON Term. OFF

OFF ON OFF OFF ON Term. OFF

ON ON OFF OFF OFF Term. OFF

Pin assignment and function RS422/485, DB9 male

Pin Direction Signal Description Default function (*)

1 OUT TxD A/- Transmit Data A Data out

2 IN RxD A/- Receive Data A Data in

3 OUT RTS A/- Ready To Send A Handshake out

4 IN CTS A/- Clear To Send A Handshake in

5 --- GND Signal Ground ---

6 OUT TxD B/+ Transmit Data B Data out

7 IN RxD B/+ Receive Data B Data in

8 OUT RTS B/+ Ready To Send B Handshake out

9 IN CTS B/+ Clear To Send B Handshake in

(*) Applies only to the hardware handshake setting

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W&T The serial combi-port

Subject to error and alteration

Operation modes

The DIL switches are used to set the following modes:

• RS422, RS485 4-wire bus master

Provides one data and handshake channel each in each direction. The RS422/485 drivers and receivers are always active in this mode.

• RS485 4-wire with automatic control

One data channel is available in each direction. The RS485 driver chip is automatically activated each time data is sent out and then disabled when data is ﬁnished sending. The receive channel is always active in this mode.

• RS485 2-wire bus with automatic control

Handshake for RS485 modes

RS485 bus systems do not use ﬂow control in the traditional sense for data integrity, but rather a logical protocol. The handshake procedure for the Com-Server must therefore be set to NO (see The serial parameters (Menu: UART Setup).

Terminating

All RS485 modes require a termination network on the bus sytem which ensures a deﬁned rest state in the high-ohmic phases of bus operation. Connection of the bus system with a termination network can be done in the interface by closing the DIP switches 6 and 7 on the module:

Page 40

W&T The serial combi-port

+5V

SW6

SW7

330O 330O120O

Data In B

Data In A

Wiring examples

RS422 connection with hardware handshake

Data Out A

Data Out B

Handshake Out A

Handshake Out B

Com-Server

RS422/485

Handshake In A Handshake In B

Data In A

Data In B

1 6

2 7

3 8 4

RxD A (-) RxD B (+) TxD A (-) TxD B (+) CTS A (-) CTS B (+) RTS A (-) RTS B (+)

RS485 connection (4-wire bus master)

Data Out A

Data Out B

Handshake Out A

Handshake Out B

Com-Server

RS422/485

Handshake In A Handshake In B

Data In A

Data In B

1 6

2 7

3 8 4

RxD A (-) RxD B (+) TxD A (-) TxD B (+)

device

RS585

device

RS585

device

RS585

RS485 connection 2-wire

1 6

2 7

3 8 4

Bus A (-) Bus B (+)

device

RS585

device

RS585

Com-Server

Data Out A

Data Out B

Data In A

Data In B

Handshake Out A

Handshake Out B

RS422/485

Handshake In A Handshake In B

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Subject to error and alteration

6 LED displays

. Power, Status , Error LED

. Network LEDs

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W&T LED displays

6�1 LED displays

Power Status

Status

Power Status

Status

Power Status

Status

Error

Power

ABC

Error

Power-LED

On indicates that power is present on the external screw terminals or – with model 58665 – via PoE.

Error

Power

ABC

Error

Status-LED

Rapid continuous ﬂashing = bootup, no IP

Rapid continuous ﬂashing (approx. 3x/s) indicates that the Com-Server is in the bootup phase and/or has not yet been assigned an IP address. Please use WuTility for example to assign the Com-Server an IP address. Slow continuous ﬂashing = connection Periodic ﬂashing (1/s) indicates that the port has a valid connection to another network station. The status of the serial port can also be read out using WBM or the ComServer‘s Telnet conﬁguration tool.

Error

Power

ABC

Error

Error-LED

The Error LED uses various ﬂashing patterns to indicate error conditions on the device or serial port. The error texts for the previous ﬁve serial faults and the associated system time (time between the last restart of the ComServer and when the error occured) can also be read out using the Telnet conﬁguration tool.

Rapid continuous ﬂashing = IP address conﬂict The IP Address Conﬂict Detect function is activated and the Com-Server has detected an IP address conﬂict. This means the current IP address of the Com-Server is also used by other stations in the network. To prevent further problems, please contact the responsible network administrator and have the conﬂict resolved.

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W&T LED displays

Subject to error and alteration

2 x ﬂashing = Check serial data format The serial port received at least one character with a parity or framing error (= parity error / framing error), or the data register of the serial receiver ship was written even though the previous character was not read out. Check the correctness of the serial parameters, the handshake procedure and the connection cable. 3 x ﬂashing = Check serial handshake The serial connected device is not responding to the handshake stop signal set by the Com-Server and continues to send data. The result can be that the serial ring memory is overwritten and data are lost. Check the handshake conﬁguration of the device as well as the wiring of the connection cable. All LEDs on = Self-test error The self-test performed after each start or reset of the Com-Server could not be correctly ﬁnished. This error can occur when you have prematurely broken oﬀ a software update and the full operating software could not be transferred. The Com-Server is no longer capable of being operated in this condition. Repeat the software update over the network (see Firmware update of the Com-Server), and address the Com-Server using its assigned IP address.

If the fault cannot be remedied, the problem may lie with the hardware.

Speed

OFF: Simultaneous illumination/ﬂashing of the Link/Activity LED means there is a link to a device at a rate of 10 MBit/s (10BaseT). ON: Simultaneous illumination/ﬂashing of the Link/Activity LED means there is a link to a device at a rate of 100 MBit/s (100BaseT)

Speed

Link/Activity

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W&T LED displays

Link/Activity

Speed

Link/Activity

OFF: The Com-Server is not detecting a Link pulse from a hub or switch. Check the cable or the hub port. ON: The Com-Server has a valid link to a hub or switch. The Speed LED indicates the data rate in this case. Flashing: The Com-Server is receiving or sending network packets

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7 Conﬁguration access to the Com-Server

After completing the hardware installation and assigning the IP address,

the remaining Com-Server conﬁguration takes place over the network.

Here either a Telnet client or, after it has been activated, an Internet brow-

ser can be used.

. Telnet conﬁguration under Windows

. Conﬁguration with the Internet browser

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W&T Conﬁguration access to the Com-Server

7�1 Conﬁguration menu structure

The setup of the Com-Server is treelike regardless of whether the conﬁguration is used for a Telnet client or an Internet browser. An overview of all the levels can be found in the following illustration.

Prior to configuration a valid IP address must have been already assigned to the Com-Server (see “Assigning the IP Address”). Access is then possible from virtually any computer having network access and an installed TCP/IP protocol.

A detailed description of both conﬁguration access types, their conditions as well as the respective navigation within the menu tree can be found in the following section.

HTTP protocol and its standard port 80 are fre

quent targets of Web attacks. In order not to impair data throughput of the applications and of the Com-Server, Web Based Management is therefore factory disabled. Ways of activating this as part of the startup process can be found in the section on Web Based Management.

If you exit the conﬁguration menu by closing the Telnet connection without ﬁrst invoking SAVE Setup, the original conﬁguration is retained.

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W&T Conﬁguration access to the Com-Server

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SETUP Port 1

SETUP Port 2

INFO System Cable Type

SETUP System Setup TCP/IP

SETUP Port 0 Port State Connection State

SAVE Setup

Logout

To activate the new settings

always save using SAVE Setup

with Telnet or the LOGOUT

link on the webpages

(1) Factory defaults are printed bold

MAC address SOFTW Date/REV HARDW Rev Run Time

System Password System Name Logfile Flash Update Factory Defaults Reset Link Speed (Auto, 10|100BT, HD|FD)

UART Setup

TCP/IP Mode

Telnet:

Transfer the selected parameters and save all settings in non-volatile memory on the ComServer

Browser:

Transfer the selected parameters and save all settings in non-volatile memory on the ComServer

IP-Address (0.0.0.0) Subnet Mask

Gateway

DNS-Server MTU (560-1460)

DHCP Client

System Port List Wake on LAN

Keep Alive Time 30s

Retransm. Timeouts IP Address Conflict Detect

Byte Counter Error State Clear Port Mode Baud

Parity NONE

Data Bits

Stopbit

Handshake

Receive Buffer (InQueue): 32-4094 Bytes

Port List

TCP Server Activ. Packet Options

TCP Client

UDP Client

Telnet Server Activate yes/no

Telnet Client

FTP Server Activate yes/no FTP Client

Box to Box (TCP)

SLIP Router

InQueue Copy

System Options

(1)

Standard Gateway (0.0.0.0)

Route 1 Route 2 Route 3 Route 4

Standard Baudrates Special Baud Divisor

EVEN ODD

None

Hardware Software Special

Local Port TCP/UDP Controlport TCP

Telnet Port (TCP)

FTP Port (TCP) Reset Port (TCP)

Server Port Server IP/URL Special Options

Telnet Echo Server Port

Server IP/URL Special Options

Server Port Server IP/URL

Special Options Server Port

Server IP TLS(SSL) Encryption Activ. Packet Options

Net Address SLIP-Net Routing

Local Copy Port Accepted Copy-Slave IPs

Network Delay Flush Buffer Packet Options

SPACE MARK

Destination Netmask Gateway

230,4k 153,6k 115,2k 57600 38400 19200

9600

4800

Pin: RTS Pin: DTR Pin: CTS Pin: DSR XON/XOFF XON/XOFF (Filter)

Activ. Packet Options Inactivity Timeout Connect. Timeout Disconnect Char Client: "C"+Addr Response Mode

Activ. Packet Options Client: "C"+Addr Write: "C"+Addr Disconnect Char

Disconnect Char Inactivity Timeout Serial 0d -> 0d00

Auto FTP FTP Client Login Inactivity Timeout Connect. Timeout Protocol Char

Start-/Endsequ. Startsequ. + Length Filed Interpacket Delay Fixed Packet Length

2400 1200 600 300 150 110 757200 50

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W&T Conﬁguration access to the Com-Server

7�2 Conﬁguration via Telnet

On Unix/Linux systems as well as Windows up to XP the telnet client is included in the standard installation of the operating systems.

The TCP port number for the telnet conﬁguration is conﬁgurable in menu path Setup Port x r TCP/IP Mode r Port List r

Telnet Conﬁguration Port. The factory default port number is 1111, so that you must start the connection from within the

telnet client using the corresponding parameter:

telnet [IP-Adresse] 1111

With Windows Vista the telnet client must be explicitly installed together or after the fact. Here we recommend starting using the WuTility inventorying and management tool. If the telnet client is not installed on the respective system, an alternate telnet client (putty.exe) is automatically used.

If the connection could be opened and no system password is assigned (= factory default setting), you will see the following menu in your Telnet window. If a system password was conﬁgured, this will be asked for in front of the menu.

***************************************

* Com-Server [model name] *

* “COMSERVER-0A1B2C” *

***************************************

1. INFO System

2. SETUP System

3. SETUP Port 0 (Serial)

4. SAVE Setup

7�2�1 Navigation within the Telnet menu

An overview of the entire Com-Server conﬁguration menu is shown on the previous page. On the monitor you will see

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W&T Conﬁguration access to the Com-Server

Subject to error and alteration

always just one level of the selected menu. Simply entering the number of the desired menu and pressing the ENTER key takes you to the next level. Entering a q or pressing the EN- TER key takes you back to the previous menu level.

The last conﬁgured value of a menu item appears in parentheses. If you make changes, the new value will appear at this point the next time the menu is opened. It only becomes eﬀective in the Com-Server itself however if you have saved it using SAVE Setup.

As long as you do not open this menu item, you can move around in the entire menu and change values without actually changing anything.

Positioning functions for the cursor (arrow keys) or

correction actions (backspace, insert) are not available within the telnet conﬁguration and, if used, will result in faulty inputs. If you make a typing mistake, exit the menu item using <Enter> and then repeat the entire entry.

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W&T Conﬁguration access to the Com-Server

7�3 Conﬁguration via Browser - Web Based Management

The Com-Server also allows conﬁguration via HTTP protocol and a standard Internet browser. The menu structure of the WBM (Web Based Management) is compatible with the Telnet conﬁguration.

7�3�1 Activating WBM with the WuTility-Tool

The Web-Based-Management of the Com-Server can be activated at any time using WuTility as part of assigning the network parameters. Select the Com-Server in the device list and then click on the IP address button. In the ﬁrst window of the dialog enter the desired values for IP address, subnet mask and gateway and then click on the Continue button. In the following window activate the WBM option and enter the desired TCP port number. As a rule HTTP standard port 80 should be used. If use of port 80 is not possible or desired, then the deviating port number must be explicitly speciﬁed in the address line of the browser when opening the Com-Server homepage:

http://[IP-Adresse oder Hostname]:[Portnummer]

7�3�2 Activating WBM via the serial interface

When serially assigning the IP number, you can optionally specify the TCP port number under which the WBM should be accessible. To do this, ﬁrst connect the serial port A on the Com-Server and the COM port on your computer using a null modem cable. Start a terminal program and set the transmission parameters to 9600 baud, 8 data bits, no parity and no handshake. During a reset of the Com-Server hold the x key down until after approx. 2 sec. the IPno.+<Enter>: prompt appears. Now directly following the IP address enter the extended address string +w[Portno.]. Portno. represents here the desired TCP port in decimal format. A value of 0 deactivates the WBM.

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W&T Conﬁguration access to the Com-Server

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After ﬁnishing your entry by pressing the Return key, the values are stored in the non-volatile memory and you can immediately access the Com-Server and the set WBM port using your Internet browser.

Additional information about serial configuration

possibilities for the Com-Server can be found in the sections Assigning the IP Address.

Example 1:

Here the IP address 172.17.231.99 is assigned to the ComServer and +w80 is used to activate the WBM on the HTTP standard port.

xxx... -> Com-Server

IP no.+<ENTER>: <- Com-Server

172.17.231.99+w80 -> Com-Server

172.17.231.99 -1 <- Com-Server

Example 2:

In this example the Com-Server gets an IP address, subnet mask and gateway. In addition +w8585 is entered to activate WBM on TCP port 8585.

xxx... -> Com-Server

IP no.+<ENTER>: <- Com-Server

172.17.231.99,255.255.0.0,172.17.231.1+w8585 -> Com-Server

172.17.231.99 ,255.255.0.0,172.17.231.1+w8585 <- Com-Server

7�3�3 Activating WBM from the conﬁguration menu

If you want to activate WBM on an already operational ComServer, you can do this via Telnet conﬁguration. Start a Telnet session on port 1111 of the Com-Server. In the menu branch

SETUP System r Setup TCP/IP r System Port List r WBM Port

enter the decimal number of the desired TCP port under which you want to reach the WBM. Then press the Return key until you are back in the main menu and from there open the

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W&T Conﬁguration access to the Com-Server

SAVE Setup item. After you have quit the Telnet session, you can now access the Com-Server using an Internet browser.

7�3�4 Starting and navigating the WBM

To access the Web pages after activating the WBM, start your Internet browser and enter the IP address of the Com-Server and the conﬁgured port number in the address line:

http://[IP-Adresse]:[Portnummer]

If the HTTP standard port 80 was conﬁgured for WBM, you do not need to explicitly indicate the port number in the address line.

You will now be given the start page of the Com-Server with the system password prompt. The factory default setting is no system password, so that you can get to the conﬁguration menu by simply actuating the login button.

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W&T Conﬁguration access to the Com-Server

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Navigation

Since the WBM of the Com-Server is session-oriented, you must use backlinks and corresponding control buttons to navigate to the individual Web pages. Using the Back function in the browser can lead to problems in accepting the set parameters.

You can make as many settings as desired during a conﬁguration session. Pressing the Send button in the respective pages pastes them to a clipboard. Once all the settings have been made, always exit the conﬁguration session using Link Logout and the Save button there. Only then are the settings you made copied into the non-volatile memory of the Com-Server and activated.

The logout page then oﬀers the following possibilities for ending the conﬁguration session:

Save button causes the Com-Server to save all the changes you made in its non-volatile memory and quits the conﬁguration session.

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W&T Conﬁguration access to the Com-Server

The Abort button causes the Com-Server to reject all the settings you made and quits the conﬁguration session.

The Restore Defaults button resets the Com-Server to its original factory setting. All settings including the network parameters IP address, subnet mask and gateway address are lost.

The Firmware Update button activates the mode in which the Com-Server expects a ﬁrmware update via TFTP protocol (see section Firmware Update of the Com-Server). Update mode can be exited only by complete transmission of a valid ﬁrmware or by interrupting the supply voltage. When using the WuTility tool for the ﬁrmware update, this mode is automatically started. In this case a manual start is not necessary.

Restarts the Com-Server, comparable with interrupting the supply voltage. Data from any other opened connections to the Com-Server are lost in this event.

The functions located on the logout page of the

Com-Server can also be found in the Telnet menu branch

SETUP System r Setup TCP/IP.

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W&T

Subject to error and alteration

8 The basis conﬁguration of the Com-Server

Here follows the explanation of all the conﬁguration possibilities related to

the Com-Server operating system and which are not directly related to the

serial ports.

. Save settings

. Menu: INFO System

. Menu: SETUP System

Page 56

W&T The basis conﬁguration of the Com-Server

8�1 Save your settings

When conﬁguring using either Telnet or Web Based Management, all the changes are ﬁrst saved only temporarily in the Com-Server. To make sure the settings remain intact even after a reset or power failure, each conﬁguration session must be ended with an explicit save procedure.

Telnet

From the main menu select SAVE Setup. Respond with y to the Save Changes ? prompt. If a correct entry was made, the text Saving… will appear on the monitor, and the Com-Server saves all the settings you made in its non-volatile memory. Once the data have been saved, they are activated each time the Com-Server is turned on or reset.

Entering anything other than y or simply pressing the ENTER key returns you to the main menu without saving the values.

Exceptions are the network parameters IP address,

subnet mask and gateway, since these are also relevant for the running conﬁguration session. To save and activate these you must enter q to quit the Telnet conﬁguration after executing SAVE Setup. The Com-Server then autonomously performs a reset and only then begins to work with the new settings.

Browser

Exit the conﬁguration session using the Link Logout and click on the Save button.

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Subject to error and alteration

8�2 Menu: INFO System

This menu allows you to call up device-speciﬁc parameters such as the version njmber and creation date of the ﬁrmware, MAC address of the unit, etc.

Cable type

Indicates whether the connection to the hub/switch is using 10BaseT or 100BaseTX. The duplex procedure is also indicated (Full- or Half-Duplex).

MAC address

Shows the Ethernet address of the Com-Server. This number is factory set and registered. It cannot be changed.

SOFTW Date/Rev�

Shows the creation date and version number of the operating software in ﬂash.

HARDW Rev�

Shows the version status of the Com-Server hardware.

Run Time

Shows the time in hours and minutes since the last ComServer restart.

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W&T The basis conﬁguration of the Com-Server

8�3 Menu: SETUP System

This menu is for conﬁguring all the parameters that pertain to the Com-Server operating system and are independent of the serial interface.

8�3�1 Menu: SETUP System r Setup TCP/IP

IP-Address (Default= 0.0.0.0)

Enter here the IP address if you want to change it. Please note that this number is not freely selectable, but rather needs to be speciﬁed based on the network address of the TCP/IP network. The format corresponds to the normal syntax (e.g. 172.16.231.5).

Subnet Mask (Default = 255.0.0.0)

Enter the subnet mask of the subnet in which the ComServer is located (e.g. 255.255.255.0).

Gateways (Default = 0.0.0.0)

In this menu branch the IP address of the standard gateway or router can be conﬁgured. If you have not conﬁgured ﬁxed routes, the standard gateway is used for all network packets whose destination IP address is not in the local subnet.

Route 1 - 4 (Destination, Netmask, Gateway)

In addition to the standard gateway, up to four ﬁxed routes can be deﬁned. Packets whose destination addresses are in the networks conﬁgured here (=destination) are always sent through the gateway assigned to this route. A ﬁxed route is only accepted and stored by the Com-Server if the following check is true:

Destination AND Netmask == Destination

Changes to the system parameters IP address,

Subnet Mask, Gateway and Route 1-4 cannot be activated right after saving. The Com-Server will use these values

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only after closing the current Telnet connection using q.

DNS Server (Default: 0.0.0.0)

The entry contains the IP address of the DNS server (Domain Name System). The latter is needed in all client modes of the Com-Server (TCP, UDP, Telnet, FTP client) if the destination system is to be stored in the conﬁguration not as a numerical IP address, but rather in the form of a host name or URL. The name is resolved by the Com-Server is done via UDP using standard port 53 reserved for the DNS.

The Time-To-Live of the IP address resolved for a host name is determined by the Time-To-Live parameter contained in the response from the DNS server. After the name has been successfully resolved this time is displayed in the menu item Setup Port x r Port State r Connection State.

MTU – Maximum Transfer Unit (Default: 560)

This value determines the maximum size of a TCP/IP pakket. It refers to the number of bytes (excluding header) that can be sent in a packet. The smaller the MTU, the more network buﬀer overall is available in the Com-Server. The selectable range begins at 560 and ends at 1024 bytes. The values can be set in increments of 128 bytes (automatic correction).

DHCP Client (Default: 1 = ON)

The DHCP protocol is activated with the factory settings (menu entry = 1). The Com-Server attempts to ﬁnd a DHCP server and get an IP address from it. Entering 0 deactivates DHCP and the Com-Server works statically with the IP address assigned to it. More information on how DHCP works can be found in the section IP Assignment via DHCP Protocol.

To prevent unintended address assignments or

changes, we recommend deactivating the DHCP protocol if it is not expressly used in the respective network environment.

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n System Port List

From the respective submenus you can configure and disable the TCP and UDP port numbers under which the following conﬁguration and control accesses for the ComServer are reached. Entries are made in decimal. The value 0 disables the service.

The TCP/UDP ports with access to the serial port on the Com-Server can be conﬁgured from the submenu Setup Port x r TCP/IP Mode r Port List konﬁguriert werden.

• WBM Port (Default = TCP/0) Chapter Conﬁguration via Browser

• Telnet Conﬁguration Port (Default = TCP/1111) Chapter Conﬁguration via Telnet

• SNMP (Default = UDP/161) Chapter SNMP management

• Device Reset Port (Default = TCP/8888) Chapter Reset of the Com-Server

• Init Flash Update Port (Default = TCP/8002) Chapter Firmware update of the Com-Server

• Read Conﬁg Port (Default = TCP/8003) Chapter Up-/Download conﬁguration data

• Write Conﬁg Port (Default = TCP/8004) Chapter Up-/Download conﬁguration data

• Info Port (Default = UDP/8513)

Chapter Inventory via UDP

Changes to the factory default port numbers as

well as disabling services should be done with caution, since they can result in malfunction of conﬁguration and management tools such as WuTility. If for example the telnet conﬁguration and WBM are disabled, you can no longer conﬁgure the Com-Server. Restore the factory default values by performing a hardware reset of the Com-Server.

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n Wake on LAN (Default: deactive)

Up to three Ethernet addresses for network components can be conﬁgured, which are enabled when there is a restart of the Com-Server via Wake-on-LAN.

For proper function of Wake-on-LAN it must be

supported and activated by the BIOS and the net-

work card in the destination computer.

Keep Alive Time (sec) (Default: 30s)

If the keep-alive check is activated by entering and saving a value in second ticks, all TCP connections are monitored for network-side data traﬃc. If there is no network traﬃc within the set time, the Com-Server generates a keep-alive packet. If the partner does not answer this packet, the connection is reset in the Com-Server. This deletes any data still contained in the serial in- and output buﬀers.

Example: A TCP client has opened a connection to TCP server port 8000 of the Com-Server and the network connection is interrupted. After the set keep-alive time plus 2s for two repetitions has elapsed, the Com-Server closes the connection and is again ready for any other clients.

Retransmission Timeouts (ms) (Default: 240)

This timeout determines what time must elapse before network packets are repeated if necessary. In most networks the default setting of 240ms can be used. Only when there are very long latency times between the Com-Server and its respective communications partner would you need to increase this value.

IP Address Conﬂict Detect (Default: deactive)

Firmware version 1.31 and higher enables the Com-Server to detect and display an IP address conﬂict. An active check is performed each time the Com-Server is restarted. Only passive monitoring is performed during normal

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running. Details on this functionality can be found in RFC5227, IPv4 Address Conﬂict Detection.

If the Com-Server detects that its current IP address is also being used by another station in the local network, it indicates this conﬂict by rapid ﬂashing of the Error LED. In addition a corresponding message including the competing MAC address is generated in the Error State (Setup Port x r Port State r Error State).

IP address conﬂicts generally lead to communication

problems which are diﬃcult to diagnose. Please therefore inform the responsible administrator in such cases.

8�3�2 Menu: SETUP System r System Password

The system password, which consists of any 31 (max.) characters, protects against any subsequent conﬁguration and control access to the Com-Server.

· Telnet conﬁguration menu (Default = 1111/TCP)

· WBM (if enabled)

· Init Flash Update Port (Default = 8002/TCP)

· Read the conﬁguration ﬁle (Default = 8003/TCP)

· Write the conﬁguration ﬁle (Default = 8004/TCP)

· Reset Com-Server (Default = 8888/TCP)

· Reset Port Status (Default = 9084/TCP)

· Controlport (Default = 9094/TCP)

· SNMP (Default = 161/UDP)

On Telnet port 1111 and on WBM port the system password is prompted as soon as the connection is opened. For all other

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associated TCP ports the password must be null-terminated (=[password] + 0x00) and sent to the Com-Server no later than 2s after the TCP connection has been established. Queries from SNMP managers are only responded to by the ComServer if the community corresponds to the system password.

For additional information on using system passwords in conjunction with the conﬁguration and control ports, see the section Expanded Services of the Com-Server.

8�3�3 Menu: SETUP System r System Name

The freely conﬁgurable system name consisting of max. 31 characters is used to identify the Com-Server. This name is displayed as an opening message in the client for all Telnet sessions.

If the tag <wutl> is used inside the system name, the ComServer replaces it each time there is an output or communication with the last three places of its Ethernet address.

8�3�4 Menu: SETUP System r Logﬁle

The Logﬁle contains the last (max. 3000) connections and connection attempts for conﬁguration accesses by the ComServer with the associated time stamp and address parameters.

Accesses to the following services are registered:

· Telnet conﬁguration menu (Default = 1111/TCP)

· WBM (if enabled)

· Init Flash Update Port (Default = 8002/TCP)

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· Read the conﬁguration ﬁle (Default = 8003/TCP)

· Write the conﬁguration ﬁle (Default = 8004/TCP)

· Reset Com-Server (Default = 8888/TCP)

· Reset Port Status (Default = 9084/TCP)

Activate Logﬁle (Default= 0 = OFF)

A 1 activates recording. In addition the Save Interval must be conﬁgured to a valid value.

Save Interval (min) (Default= 0)

Conﬁguration of the time interval in minutes at which the Logﬁle is written to the non-volatile memory of the ComServer.

Saving the Logfile has an influence on the

latencies of the serial data transmission. We recommending conﬁguring the Save Interval only as low as absolutely necessary. When timeouts occur in serial data exchange, logging should be disabled on a test basis.

Delete Logﬁle

Deletes the entire Logﬁle including the non-volatile stored entries.

Reading/Viewing the Logﬁle

The Logﬁle can be viewed using the Web Based Management of the Com-Server under Setup System r Logﬁle r Load. The Logﬁle can be downloaded via TFTP. The name to be speciﬁed in the TFTP client must be wut_cs_logﬁle. (Note period at the end!)

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8�3�5 Menu: SETUP System r Flash Update

Before you activate the update mode, make sure that you have quit any active network connections. Then conﬁrm with „y“. The update mode is indicated by lighting of the Status LED on the Com-Server.

WuTility automatically enables update mode through TCP port

8002. Manual enabling is therefore only necessary if this port is blocked, such as by a ﬁrewall.

You may quit the update mode only by either

completely performing the update or by means of a reset, i.e. turning oﬀ the power!.

8�3�6 Menu: SETUP System r Factory Defaults

Enter a y to restore the factory default settings.

Resetting the non-volatile memory causes loss of all

the settings which deviate from the default values, including the IP address.

8�3�7 Menu: SETUP System r Reset

Select this menu item to perform a software reset on the Com-Server. First your Telnet connection is properly closed.

All data from any still open network connections are

lost.

8�3�8 Menü: SETUP System r Link Speed

The Com-Server is factory set for autonegotiation. Data transmission speed and duplex procedure are automatically negotiated with the connected switch/hub and set correspondingly.

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In addition to autonegotiation, the Com-Servers as well as many manageable switches can be configured for fixed transmission parameters with respect to speed and duplex procedure. To prevent communications problems (duplex mismatch), only the following two combinations are permitted:

• Both parties (switch and Com-Server) are operated in Auto-

Negotiation mode (recommended).

• Both parties are conﬁgured for the same (ﬁxed) transmissi-

on speeds and duplex mode.

Changing the link speed is activated only after

saving and exiting the telnet or WBM session by means of an automatic Com-Server reset. Data from any open network connections is lost. If the newly selected setting is not supported by the port used on the switch ort hub, the ComServer may then not be accessible.

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8�4 Menu �� r TCP/IP Mode r System Options

n Network Delay [10ms-Ticks]

Default: 0000)

This value speciﬁes the minimum delay time of the ComServer after serial data have arrived. After this time has expired, it packs the data into a network packet and sends them to the respective communications partner. The default setting 0 means the attempt is made to send the data as quickly as possible. The resulting high time transparency does however bring with it the drawback of a higher number of network packets.

If the serial transmission takes place in predictable block sizes, this value can be adjusted to optimize the network load. There is also the advantage that the serial blocks are transmitted within a network packets, so that they arrive at the receiver bundled.

Example:

You are using serial data blocks of 25 bytes each and transmission parameters of 9600 baud, 8 data bits, no parity and 1 stop bit. Each block thus has a length of approx. 26ms (1/9600 * 10 bits * 25 bytes). If the network delay is set here to a value of 3 (=30ms), each block is sent to the receiver with a network packet.

The situation described here applies only to a non

overloaded and error-free network. If there are interruptions in the data ﬂow on the network side, any serially accumulated data are also sent in larger network packets. For secure closed transmission of serial datagrams in a network packet we recommend the use of Packet Options. For details, see the section on Packetizing serial data- grams.

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n Flush Buﬀer

Default: active

If this switch is active, the serial buﬀer is cleared each time a new connection is opened; any residual data which cannot be transmitted (e.g. handshake stop of the serial terminal device) are thus lost. But if you connect a terminal device to the Com-Server which for example requires a longer handshake stop for program reasons, you can prevent clearing of the buﬀer by deactivating the switch. In this way multiple connections can be opened one after the other on the network side and the data are accumulated in the buﬀer until they are sent.

Packet Options

Default: deactive

The Packet Options in this menu branch are criteria which allow the Com-Server to detect the start and end of contiguous datagrams in serial receiving. They allow a serial datagram to be sent to the communication partner closed in a network packet. In addition to start/end sequences and ﬁxed packet lengths, pauses can also be triggered in the data stream.

For details, see the section on Packetizing serial data- grams.

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9 Conﬁguration of the serial port

. Conﬁguring the serial transmission parameters

In addition to the usual settings for baud rate, data bits, parity and stop

bits, the various handshake procedures and available special functions of

the individual control signals are explained here.

. Setting the TCP/UDP services with access to the serial port

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9�1 The serial parameters (Menu: UART Setup)

All RS232 parameters relevant to operation are conﬁgured in the submenu Setup Port x r UART Setup. An overview of the entire conﬁguration tree can be found in the section Structure of the Conﬁguration Menu.

If you are using the device in conjunction with the W&T COM Port Redirector, it is not necessary to conﬁgure the serial parameters in the Com-Server. The COM Port Redirector automatically sets the parameters needed by the serial application in the Com-Server.

The settings only become active after saving with

SAVE Setup or pressing Save on the Logout page.

9�1�1 Baud rate, Data bits, Stop bits, Parity

The desired transmission parameters can be selected by entering the corresponding designation in the respective branch of the menu tree. Invoking Save Setup in the master menu or Save on the WBM logout page saves the changes you made in the non-volatile memory of the Com-Server and simultaneously activates them.

Freely selectable baud rate (Special Baud Divisor)

In the submenu Special Baud Divisor you can enter any desired divisor for generating the baud rate. This makes it possible to work even with non-standard baud rates. The baud rate and divisor are calculated using the following formulas.

Com-Server++, 58665

Divisor=

The maximum baud rate of the Com-Server++ is 230,4kBd, which corresponds to a divisor of 11.

32*Baudrate

83*10

Baudrate=

32*Divisor

83*10

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n Com-Server 3x Isolated

Divisor=

7,3728*10 7,3728*10

64*Baudrate

The maximum baud rate of the Com-Server 3x Isolated is 115,2kBd, which corresponds to a divisor of 1. 230,4kBd is only available as standard baudrate.

The currently conﬁgured baud rate is displayed when selecting the submenu SETUP Port x (serial) r UART Setup.

9�1�2 The handshake modes

(SETUP Port x r UART Setup r Handshake)

This menu provides three standard modes for ﬂow control of the serial port. As opposed to these predeﬁned handshake proﬁles, you can use the Special submenu to specify the function of each control signal individually. Details on the control line functions are contained in the description of the submenu Handshakle r Special.

Hardware handshake

Flow control is handled using the RTS and CTS signals. The Com-Server only sends data to the serial device if the CTS input is High. In the opposite direction the ComServer indicates readiness using the RTS line.

Baudrate=

64*Divisor

Function control signal: RTS: Flow Control DTR: Show Connection CTS: Flow Control DSR: NO

n Software handshake

The software handshake is implemented using the two ASCII characters (11H)=XON and (13H)=XOFF. In the standard setting Software Handshake these two codes are considered by the Com-Server as control characters and are

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ﬁltered out from the actual data ﬂow in both directions. This ﬁltering can be turned oﬀ individually for each data direction in the Special submenu.

Function control signal: RTS: NO (Default HIGH) DTR: NO (Default HIGH) CTS: NO DSR: NO

n NO handshake

Turns oﬀ any hardware or software ﬂow control for the serial interface. All the data are output to the connected terminal device regardless of the status of the inputs CTS and DSR. Any impending overﬂow of the serial input buﬀer is not signalled by the Com-Server. The setting NO Handshake makes sense for any data transmission that uses a serial protocol for data integrity or ﬂow control.

Function control signal: RTS: NO (Default HIGH) DTR: NO (Default HIGH) CTS: NO DSR: NO

n Special

Here it is possible to conﬁgure the function of the control lines diﬀerently from the three predeﬁned protocols. Toggle between on and oﬀ by entering the menu number of the desired function. Settings made here are correspondingly overwritten by selecting one of the three predeﬁned handshake modes.

Pin: RTS & Pin: DTR

The following functions can be assigned to the outputs RTS and DTR: 1� Flow Control – If this function is turned on, the Com-Server handles the RS232 ﬂow control through the corresponding output. The ready state for serial data is signaled by a HIGH signal (+3...12V). If the memory limit of the input buﬀer is reached, the line is set to LOW (-3...-12V).

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2� Show Connection – The output is switched to the serial port depending on an existing TCP connection. HIGH (+3...12V) indicates an existing connection. 3� NO (Default=HIGH) – The outputs are not used by the Com-Server and carry a constant HIGH level (+3...12V). 4� NO (Default=LOW) – The outputs are not used by the Com-Server and carry a constant LOW level (-3...12V).

PIN: CTS und PIN: DSR

The inputs CTS and DSR can be assigned the following functions: 1� Flow Control – The serial ﬂow control is performed using the corresponding pin. Serial data are output only if the input was set to HIGH (+3...12V) by the connected terminal device. 2� OPEN/CLOSE – Connection This option for TCP connection building and ending can be used to control connection building and ending in all Com-Server client operating modes. If the IP address and the TCP port are stored in the Com-Server, a HIGH level (+3...12V) on the corresponding input establishes a connection. The connection is closed with a LOW level (-3...-12V). 3� Accept only by HIGH – Connection establishment of a TCP client is only accepted if a HIGH level (+3...12V) is present on the corresponding input. Likewise the connection is rejected when there is a LOW level. 4� NO (Manual IN) – The selected input is ignored by the Com-Server.

XON/XOFF

Here the handshake can be conﬁgured for XON/XOFF separately for each data direction. XON/XOFF Receive switches processing of this control character for serial receiving on: After receipt of an XOFF sent by the

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RS232 terminal device, the Com-Server stops serial data output until it receives an XON. If XON/XOFF Send is turned on, the Com-Server generates an XOFF when it is no longer able to receive serial data.

XON/XOFF (Filter)

If XON/XOFF is turned oﬀ for ﬂow control, this option can be used to separately determine for both data directions whether the Com-Server ﬁlters these control characters out of the actual data. 1� Send-Filter (Data direction network r serial) If this option is turned on and XON or XOFF characters occur in the actuqal data, the Com-Server ﬁlters them out and does not pass them along to the terminal device. Select this mode generally for bi-directional RS232 connections, since otherwise you will have problems with data traﬃc. If the Send-Filter option is turnd oﬀ, all the data including the XON and XOFF characters are sent unﬁltered on the RS232 interface. This mode only makes sense if the connected terminal device is a graphics printer whose data stream can be expected to contain handshake characters. 2� Receive-Filter (Data direction serial r network) If this option is turned on, the Com-Server interprets the XON and XOFF characters sent by the serial terminal device as control bytes and does not insert them into the network data stream. This ensures that the recipient in the network only gets actual user data. If Receive-Filter is turned oﬀ, the XON and XOFF characters sent by the serial terminal device are transmitted to the network together with the actual user data. This mode requires of the respective recipient in the network that it be able to separate actual data from control data.

The currently selected parameters are shown in the top line of the UART Setup menu:

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[Baud], [Parität], [Datenbits], [Stopbits], [Handshake]

Possible values for the handshake variables are:

Send ﬁlter Receive ﬁlter

[N] No handshake --- ---

[H] Hardware handshake --- ---

[S] Software handshake

Xon/Xoﬀ

[Special] Special >setting

conﬁguration menu „Handshake Special“

ON ON

--- ---

9�1�3 Receive Buﬀer (InQueue)

The Com-Server is factory conﬁgured with a serial input buﬀer capacity of 4094 bytes. The sub-menu Receive Buﬀer allows you to reduce this to 32 bytes, with only even values permitted.

In most applications the emphasis is on maximum data throughput, so we recommend not changing the maximum value of 4094. It does however make sense to reduce the value when working with serial protocols together with unreliable or noisy network connections. This prevents datagram repetitions from being accumulated on the part of the serial master when there are connection errors and keeps them from being sent in bundled form after the connection is resumed.

Please ensure that when communicating without

serial ﬂow control the Receive Buﬀer is at least as large

as required for the longest expected serial data packet.

9�1�4 FIFO Send/Rec (only Com-Server 3x Isolated)

The submenu allows the FIFO memory of the serial receiver component to be turned on and oﬀ. It is recommended that

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the FIFOs be turned on to reduce the system load especially when sending large data quantities at high baud rates above

57600. If for example you need a short delay in sending data as possible when working with serial protocols, the FIFOs should on the other hand be turned oﬀ.

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9�2 TCP-/UDP port numbers (Menu: TCP/IP Mode)

In the menu branch Setup Port x r TCP/IP Mode r Port List you can conﬁgure the TCP server ports for all services with access to the serial ports on the Com-Server. Changes to the port numbers must be set the same in the client-side communication partner. A value of 0 disables the service.

Changes to the factory-set port numbers as well as

disabling services should be done with caution, since these can result in a connection break to any connected communication partners such as the COM Port Redirector. If the Local Port is disabled, no data exchange with the serial connected device is possible. The default values can be restored by resetting the Com-Server to its factory default settings.

Local Port TCP

(Default = 8000/Port A, 8100/Port B, 8200/Port C) Under this port number a data-transparent TCP connection to the serial port on the Com-Server is made available. The port is required for use in the operating modes TCP Server, COM Port Redirector and Box-to-Box.

For detailed information see chapter:

Data transfer per TCP/IP-Sockets The Windows COM port redirector Box-to-Box mode

Controlport

(Default = 9094/Port A, 9194/Port B, 9294/Port C) The control port allows conﬁguration of the serial port on the Com-Server over the network. Use of the control port is required for operation together with the COM Port Redirector.

For detailed information see chapter:

The Windows COM port redirector The Controlport

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Telnet Port/TCP

(Default = 6000/Port A, 6100/Port B, 6200/Port C) The telnet port allows access to the serially connected device with a standard telnet client. The port is always required for Telnet Server mode.

For detailed information see chapter:

Telnet Server

FTP Port/TCP

(Default = 7000/Port A, 7100/Port B, 7200/Port C) The FTP port enables access to the serially connected device with a standard FTP client. The port is always required for FTP Server mode.

For detailed information see chapter:

FTP Server

Reset Port Status

(Default = 9084/Port A, 9184/Port B, 9284/Port C) For special applications this port oﬀers the ability to carry out a forced reset of the Com-Server port: the parameters for the current connection are deleted.

For detailed information see chapter:

Reset Com-Server Port

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10 Packetizing serial datagrams

Some serial protocols monitor the synchronous reception of datagrams

with character delay time. When this timeout between two characters is ex-

ceeded the associated datagram is rejected or evaluated as a transmission

error. In such environments it may be necessary to send serial datagrams

closed in a packet on the network side as well.

. Packet Options

. Start-/Endsequence, Length Field

. Interpacket Delay

. Fixed Packet Length

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10�1 Packet Options

Packet Options in the menu path Setup Port x r TCP/IP Mode r SystemOptions are criteria which allow the Com-Server to

detect the start and end of contiguous datagrams in serial receiving. They allow a serial datagram to be sent to the communication partner closed in a network packet. Such datagram-optimized transmission is often necessary in tunneling and transmission of serial protocols which require synchronous reception of the data packets with a deﬁned character delay time.

For serial protocols which emphasize the greatest possible latency-free transmission and shortest possible acknowledgement delay time, Packet Options should not be used. By factory default the Com-Server operates latency-optimized and sends received data as soon as possible to the respective communication partner.

Regardless of how Packet Options is configured, the

Com-Server sends all received data to the network-side communication partner as soon as the set MTU is reached. The factory default setting for this is 560 bytes. In the menu path Setup System r Setup TCP/IP r MTU this can be increased to max. 1024 bytes.

The set Packet Options apply to the following Com-Server modes.

• TCP client

• TCP server

• UDP peer

• COM redirector

• Box-to-Box

• OPC server

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10�1�1 Startsequence/Endsequence

The Com-Server sends the datagram when one of the two conﬁgured Start AND End sequences has been received. If the network send will be triggered only by an End Sequence, Start Sequence Size 1 and Start Sequence Size 2 must be conﬁgured to 0.

Activate this Packet Option (Telnet)

Activates the selected option for serial data reception.

Start Sequence Size 1/2

Enter the length of the respective Start Sequence in bytes. The max. length is 3. A value of 0 deactivates monitoring of the Start Sequence.

Start Sequence 1/2

Hexadecimal, space-delimited byte sequence of the respective Start Sequence. The input ﬁeld is only activated if the sequence size was previously speciﬁed and sent to the Com-Server.

End Sequence Size 1/2

Enter the length of the End Sequence in bytes. The max. Length is 3.

End Sequence 1/2

Hexadecimal, space-delimited byte sequence of the respective End Sequence. The input ﬁeld is only activated if the sequence size was previously speciﬁed and sent to the Com-Server.

Additional Bytes

Number of bytes which follow after the End Sequence 1 or 2 and belonging to the serial datagram (e.g. checksum)

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Example 1:

Modbus/ASCII begins each datagram with the character : (0x3a). The end of the datagram is indicated by the character string CRLF (0x0d, 0x0a).

As soon as the Com-Server has received the character 0x3a, it collects more data until the End Sequence 0x0d 0x0a is received and then passes the datagram to the network.

Example 2:

The block end of a serial protocol is indicated by the character strings CRLF or LFCR.

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The Com-Server collects incoming serial data until receipt of the End Sequence CRLF or LFCR and then passes the datagram to the network.

Example 3:

The block end of a serial protocol is followed by the character ETX (0x03) followed by a 16-bit checksum.

The Com-Server collects incoming serial data until receipt of the character ETX (0x03) plus the next two following bytes and then passes the datagram to the network.

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10�1�2 Startsequence + Lengthﬁeld

The Com-Server sends the datagram after reception of a Start Sequence and evaluation of a length speciﬁcation contained in the datagram.

Activate this Packet Option (Telnet)

Activates the selected option for serial data reception.

Start Sequence Size

Enter the length of the Start Sequence in bytes. The max. Length is 3.

Start Sequence

Hexadecimal, space-delimited byte sequence of the respective Start Sequence. The input ﬁeld is only activated if the sequence size was previously speciﬁed and sent to the Com-Server.

Length Field Oﬀset

Start position of the length ﬁeld within the serial datagram in bytes. Counting method beginning with 0.

Size

Length of the length ﬁeld in bytes. In the protocol ﬁeld deﬁned by Length Field Oﬀset, Size and Byte Order, the ComServer expects speciﬁcation of the total length of the serial datagram, including any Start Sequence and appended checksum. If the length speciﬁcation is deﬁned diﬀerently within the serial protocol, a corresponding correction may be needed using the Additional Bytes option.

Clean network-side packetizing is only assured if

the serial datagrams do not exceed the MTU of the Com-Server. The factory default setting for this is 560 bytes. In the menu path Setup System r Setup TCP/IP r MTU this can be extended to 1024 bytes.

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n Byte Order

Organization of the length ﬁeld (net order = high-byteﬁrst; byte order = low-byte-ﬁrst)

Additional Bytes

Any number of bytes which may not be accounted for in the length speciﬁcation of the serial protocol (e.g. Start Sequence, appended checksum, etc.). This means the contents of the ﬁeld deﬁned by Size may have to be corrected to the total length of the serial datagram using the Addi- tional Bytes option.

Example

The serial protocol shown in the following always starts with the character STX (0x02). In the Length ﬁeld the length of the following data ﬁeld (serial data) is speciﬁed without the checksum and without the previous ﬁelds. The Block End is indicated by a variable 16-bit checksum.

Description

Size [byte]

Value

Start

Sequence

STX (02) any High/Low

Serial

Address

Len-Field

(Netorder)

1 2 x 2

Serial

Data

CRC16

any

The following settings must be made on the Comt-Server for correct packeting of this protocol structure:

As soon as the Com-Server has received the character 0x02 it collects additional data. If the total number of incoming cha-

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racters is equal to the sum from the Length ﬁeld and Additional Bytes, the datagram is passed to the network.

10�1�3 Interpacket Delay

The Com-Server structures the serial data stream based on a conﬁgurable rest pause in ms for serial reception. This means after receipt of any character the following data are collected until no more characters have been received within the time set as Interpacket Delay. Only now is the datagram passed into the network.

Activate this Packet Option (Telnet)

Activates the selected option for serial data reception.

Interpacket Delay

Enter the desired Interpacket Delay in ms. The permissible minimum value is 3ms. The tolerance is approx. 1 character length, as results from the serial parameters which are set.

Regardless of the configured Interpacket Delay the

Com-Server sends incoming data to the network-side communication partner only once the set MTU is reached. The factory default setting for this is 560 bytes. In the menu path Setup System r Setup TCP/IP r MTU this can be extended to 1024 bytes.

Example

Modbus/RTU separates datagrams using a rest pause of at least 3.5 character lengths. A baud rate of 9600 with data format 1 start bit + 8 data bits + 1 stop bit results in a character length of approx. 1ms. For 3.5 character lengths this results a rounded-oﬀ Interpacket Delay of 4ms:

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10�1�4 Fixed Packet Length

The Com-Server structures datagrams based on a ﬁx number of characters. This means datagrams are not passed to the network until the set number of characters has been received.

Activate this Packet Option (Telnet)

Activates the selected option for serial data reception.

Fixed Packet Length

Enter the desired number of characters.

The value set under Fixed Packet Length is limited to

the size of the MTU. The factory default setting for this is 560 bytes. In the menu path Setup System r Setup TCP/IP r MTU this can be extended to 1024 bytes.

Example

A serial device always replies to the polling from a master with a ﬁxed datagram length of 30 bytes.

For correct packeting of this protocol the following settings must be made on the Com-Server:

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11 Mode TCP-Server

The most direct way to exchange data with a serial device connected to

the Com-Server is via TCP sockets. This is especially useful in cases where

communication needs to be integrated into your own programs. Compa-

rable to traditional telephony, TCP connections always consist of an active,

calling side (=Client) and a passive, call-answering side (=Server). The Com-

Server LC works like a TCP server and enables network clients to access the

serial connected device.

. The Com-Server as TCP-Server

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11�1 The Com-Server as TCP server

TCP is a connection-based protocol, i.e. during data transmission there is a ﬁxed connection between client and server. TCP possesses all the mechanisms for opening and closing a connection and ensuring errorless data transfer over the network.

The connection is controlled by the user program (client process), which opens (connect()) and closes (close()) the connection. Once a connection is established, data can be exchanged bidirectionally between the two processes. The Com-Server output all the data from the LAN to the serial prot and in return reads in all the data from the serial port in order to convey it to your client process.

It must be noted that only one TCP client at a time can be connected to the serial port of the Com-Server. If there is already a connection, any attempt from another client is rejected until this ﬁrst connection has been properly closed or ended by means of a reset.

When there is no connection, the entry FREE must

be visible in the Com-Server port menu SETUP Port x r Port State r Connection State. If a connection is active, the entry In Use Port number <IP address> appears there.

Application examples TCP-Server mode

• A separate client program should be created for polling

the device serially connected to the Com-Server. TCP sokket communication is supported by all modern programming and script languages.

• The communication program associated with the serial

device oﬀers as a standard feature the ability to specify an IP address/port number as the destination interface.

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11�1�1 Conﬁguration of the local port number

SETUP Port x

... TCP/IP Mode

... Port List

Local Port TCP/UDP

To open a connection to the Com-Server, a client needs an IP address and the TCP port number. Direct access via TCP to the serial port of the Com-Server is done using the port number stored in the menu branch Setup Port x r TCP/IP Mode r Port List r Local port (TCP). Port number 8000 is preconﬁgured at the factory

11�1�2 Optional settings

Serial transmission parameters

SETUP Port x

... UART Setup

Baud, Parity, Data Bits, Stopbits, Handshake

Baud rate, data bits, parity and handshake procedure must conform to the connected serial device. For details see section Conﬁguration of the Serial Port.

Serial receive buﬀer

SETUP Port x

... UART Setup

The Com-Server has a variable serial receive buﬀer of approx. 4kB. The menu item allows this value to be reduced. Whether the serial receive buﬀer is automatically cleared when a connection is opened or any existing older data are sent to the

... Receive Buffer

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application is determined by the Flush Buﬀer option. Details can be found in the section Basic conﬁguration of the Com- Server.

Flush Buﬀer

SETUP Port x

This option determines whether when a network-side connection is opened to the Com-Server the serial receive buﬀer is cleared (Flush Buﬀer = 1) or any existing data are sent to the client application (Flush Buﬀer = 0). Details can be found in the section Basic conﬁguration of the Com-Server.

Packeting options for serial receive data

SETUP Port x

When sending serial protocols such as Modbus/RTU, it is often necessary to send serial received datagrams also closed on the network side in a TCP packet. The menu paths shown above oﬀer various ways to parameterize serial packet limits (pause times, start-/end sequences, datagram lengths) and to activate their processing for the respective mode. Details can be found in the section Packeting of serial datagrams.

... TCP/IP Mode

... System Options

Flush Buffer

... TCP/IP Mode

... TCP Server

Activ. Packet Options

System Options

Packet Options

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Network Delay

SETUP Port x

... TCP/IP Mode

... System Options

Network Delay

In its default setting the Com-Server attempts to sent the serially arriving data to the network-side application with as little delay as possible. Particularly when working with host serial protocols it may be necessary to send the protocol blocks enclosed in a network packet if possible. The option Network Delay in Setup Setup Port x r Setup TCP/IP r System Options allows an artiﬁcial delay in transmission for this purpose. Details can be found in section Menu ... Setup TCP/IP r System Options.

Keep Alive Time

SETUP System

Setup TCP/IP

... Keep Alive Time

The factory default setting for the keep-alive check is 30 seconds. I.e. if there is no data traﬃc the Com-Server checks during the set time interval to see whether the connected network application can be reached. If there is no reply, for example due to a break in the network infrastructure, the Com-Server resets the connection internally and thus enables a new connection to be opened. Details can be found in section Menu SETUP System r Setup TCP/IP.

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12 Mode TCP Client

Triggered by serial data reception or a serial control line the Com-Server

opens the connection to a TCP server in TCP-Client mode as needed.

. TCP-Client mode with static addressing

. TCP-Client mode with serial addressing

. Connection opening and closing control

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12�1 The Com-Server as TCP client

In contrast to the passive TCP server mode, in TCP client mode the Com-Server independently opens connections to a TCP server located in the network. The destination IP address and destination port number needed for this can either be stored in the conﬁguration or sent serially to the Com-Server before the actual user data. A trigger for opening the connection could be serially received characters or status change of a handshake procedure. The connection is closed on a time basis or when a particular serial character is received.

If there is no connection to the TCP server currently active, the portitself can also be a TCP server and accept connections from clients on its default TCP port or on the port conﬁgured in the menu branch Setup Port x r TCP/IP Mode r Port Num- ber.

After basic startup of the Com-Server and setting the serial transmission parameters in accordance with the connected device, the TCP client mode is conﬁgured in the Submenu Se- tup Port x r TCP Mode r TCP-Client.

Application examples TCP-Client mode

• The message generated irregularly from a serial device

connected to the Com-Server should be received with a program speciﬁcally designed as a TCP server.

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12�1�1 TCP client mode with ﬁxed destination system

SETUP Port x

n Server Port

Port number that the application (TCP server process) addresses on the computer.

Format: decimal

Server IP/URL

IP address or URL of the computer on which your application (TCP server process) is active.

Format: Dot notation or URL

contain space characters (0x20), nor can the ﬁrst character be a decimal (0x2E). A server IP or URL is deleted by entering 0.0.0.0. For additional information refer to the section Menu: Setup SYSTEM r Setup TCP/IP r DNS- Server.

... TCP/IP Mode

... TCP Client

Server Port Server IP/URL

A URL can only be assigned in conjunction with a valid DNS server. The name used is not allowed to

Opening the TCP connection

After saving the connection data the Com-Server waits to receive any serial character. This is the trigger for opening the connection and is sent to the TCP server together with the following data.

Alternately the connection can also be triggered via hardware depending on the status of a handshake input on the serial port (CTS or DSR). Details can be found in section Handshake modes r Special r Pin: CTS and Pin: DSR.

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Closing the TCP connection

SETUP Port x

To close the connection the following methods from the Submenu ...TCP Client r Special Options are available. If connec- tion control is conﬁgured using the handshake inputs CTS or DSR, the connection is also closed when this line drops.

Inactivity Timeout

Default: 30

Here you can specify the value for a timer. When the speciﬁed time expires, the Com-Server port closes the connection. The timer is reset if there is an active network connection when data are being exchanged. If no data are set within the speciﬁed time, the Com-Server port closes the connection to the TCP server. InactivityTimeout = 0 deactivates the connection closing after a timeout.

1 tick: 1 second Format: decimal

... TCP/IP Mode

... TCP Client

Special Options

Inactivity Timeout Disconnect Char Connection Timeout

Disconnect Char

Default: 0

If the Com-Server receives the character deﬁned here at the serial port, the connection to the TCP server is closed. The character itself is not sent to the TCP server. Default value is 0 (=deactivated).

Format: decimal

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n Connection Timeout

Default: 300

This value is a connection timeout that is only eﬀective together with an activated Inactivity Timeout . After the Inactivity Timeout expires, the Com-Server tries to send any still existing, unsent user data for the duration of the Connection Timeout. If it receives no reply from the TCP server within this time, you may assume the connection is „hanging“; the data are then rejected and the connection reset. To prevent unintended loss of data, make this value suﬃciently large. Connection Timeout = 0 deactivates resetting of the connection after a timeout.

1 tick: 1 Second Format: decimal

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12�1�2 TCP client mode with serial addressing

SETUP Port x

In this mode the address data for the server are not permanently conﬁgured, but rather transmitted serially to the Com-Server as an ASCII string in front of the actual data. This makes it possible to open connections to changing TCP servers.

Client: „C“+Addr

Default: deactive

Activating this switch activates the TCP client mode to alternating TCP servers. The address of the TCP server need not be permanently conﬁgured, rather it is send as an ASCII string in front on the user data on the serial port. The string for addressing is not included in the send. There are two possibilities for string format:

1. The parameters Server Port and Server IP/URL are zero.

... TCP/IP Mode

... TCP Client

Special Options

Client: "C"+Addr

C[IP address or URL],[port number]<CR>

Example:

C172.16.231.101,4800<CR>

Cwww.comserver.com,9100<CR>

2. The parameter Server Port contains the Default Port (e.g. 4800), Server IP/URL contains the ﬁrst three bytes of the IP address (e.g.172.16.231.0).

C 4.Byte IP address <CR>

(z.B. „C101<CR>“)

A URL can only be assigned in conjunction with a

valid DNS server. The name used is not allowed to

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