Microscan DN120 DeviceNet User Manual

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DN120 DeviceNet

Gateway

User’s Manual

DN120

PN 84-210010 Rev A

DN120 DeviceNet Gateway User’s Manual

Table of Contents

CHAPTER 1 – OVERVIEW ..................................................................................................................................... 4

CHAPTER 2 – INSTALLATION ............................................................................................................................. 5

OUNTING

IRING

DeviceNet Interface............................................................................................................................................. 6

Serial Channel Interface ..................................................................................................................................... 6

Wiring Examples................................................................................................................................................. 7

CHAPTER 3 – THEORY OF OPERATION........................................................................................................... 8

ATEWAY OPERATION

DeviceNet Object Model ..................................................................................................................................... 8

DeviceNet Interface............................................................................................................................................. 9

Serial Channel Interface ................................................................................................................................... 10

............................................................................................................................................................... 5

..................................................................................................................................................................... 6

............................................................................................................................................. 8

Asynchronous Serial Communication .............................................................................................................................11

Status Information ...........................................................................................................................................................11

Receiving Messages ........................................................................................................................................................12

Stream Mode ..............................................................................................................................................................12

Block Mode................................................................................................................................................................12

Returning Received Data............................................................................................................................................13

Padding Message Data ...............................................................................................................................................13

Re-sending Received Data .........................................................................................................................................14

Transmitting Messages....................................................................................................................................................15

Synchronization...............................................................................................................................................................15

Receive Sequence Number.........................................................................................................................................15

Transmit Sequence Number .......................................................................................................................................15

Synchronous Handshake Protocol..............................................................................................................................16

CHAPTER 4 – GATEWAY CONFIGURATION.................................................................................................18

ONFIGURE DEVICENET INTERFACE

....................................................................................................................... 18

DeviceNet Baud Rate Switch............................................................................................................................. 18

MAC ID Switches.............................................................................................................................................. 18

Serial Channel Baud Rate / Option Switch ....................................................................................................... 19

OWER UP GATEWAY

............................................................................................................................................. 19

DeviceNet Status LEDs ..................................................................................................................................... 19

Serial Channel Status LEDs.............................................................................................................................. 20

Register EDS File.............................................................................................................................................. 20

ONFIGURE SERIAL CHANNEL

ONFIGURE DEVICENET MASTER SCAN LIST

................................................................................................................................21

......................................................................................................... 26

Poll Consume Size............................................................................................................................................. 26

Poll Produce Size..............................................................................................................................................26

CHAPTER 5 – DEVICENET SPECIFICATIONS................................................................................................27

EVICENET MESSAGE TYPES

EVICENET CLASS SERVICES

EVICENET OBJECT CLASSES

................................................................................................................................. 27

IDENTITY OBJECT ............................................................................................................................................. 28

ROUTER OBJECT................................................................................................................................................ 29

DEVICENET OBJECT.......................................................................................................................................... 30

ASSEMBLY OBJECT........................................................................................................................................... 31

CONNECTION OBJECT ...................................................................................................................................... 32

SERIAL STREAM OBJECT................................................................................................................................. 34

CHAPTER 6 – RSNETWORX CONFIGURATION EXAMPLE....................................................................36

ONFIGURE DEVICENET INTERFACE

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....................................................................................................................... 37

DN120 DeviceNet Gateway User’s Manual

ONNECT

ONFIGURE SERIAL CHANNEL

ONFIGURE DEVICENET MASTER SCAN LIST

CHAPTER 7 – CONFIGURATION EXAMPLES................................................................................................ 59

XAMPLE

CHAPTER 8 – TROUBLESHOOTING ................................................................................................................. 68

& R

EGISTER

EDS F

ILE

........................................................................................................................... 37

................................................................................................................................45

......................................................................................................... 52

1 – R

ECEIVING FIXED-LENGTH DATA

.................................................................................................... 59

Barcode Scanner...............................................................................................................................................59

DN120 Gateway................................................................................................................................................ 59

2 – R

ECEIVING PRE-DELIMITED DATA

................................................................................................... 61

Barcode Scanner...............................................................................................................................................61

DN120 Gateway................................................................................................................................................ 61

3 – R

ECEIVING POST-DELIMITED DATA

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

Barcode Scanner...............................................................................................................................................63

DN120 Gateway................................................................................................................................................ 63

4 – T

RANSMITTING FIXED-LENGTH DATA

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

Bar Code Scanner ............................................................................................................................................. 65

DN120 Gateway................................................................................................................................................ 65

5 – T

RANSMITTING VARIABLE-LENGTH DATA

....................................................................................... 67

Bar Code Scanner ............................................................................................................................................. 67

DN120 Gateway................................................................................................................................................ 67

APPENDIX A – PRODUCT SPECIFICATIONS..................................................................................................69

EVICENET INTERFACE

ERIAL CHANNEL

NVIRONMENTAL

.......................................................................................................................................... 69

................................................................................................................................................... 69

APPENDIX B – DEVICENET TEMPLATE.........................................................................................................70

APPENDIX C – ASCII CHARACTER CODES.................................................................................................... 71

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DN120 DeviceNet Gateway User’s Manual

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)

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)

Chapter 1 – Overview

This document describes how to install, configure, and operate the DN120 series of serial to DeviceNet gateways. The following products are covered in this user manual:

Part Number Serial Channel DN120 RS232 full duplex

The DN120 gateways allow you to easily interface a wide variety of serial devices to any DeviceNet industrial control network. Each gateway contains the feature-packed D.I.P. DeviceNet core. Standard DN120 products are tightly packaged and sealed in a rugged industrial case. Board-level and customized gateways are also available upon request.

Serial Status LEDs

Serial Baud Rate

Switch

Rotar

DeviceNet MAC ID

Switches

Rotar

DeviceNet Status LEDs

(NET, MOD)

(RX, TX)

DeviceNet Baud Rate

Switch

Rotar

DN120

Isolated Serial Channel

male DB9 connector

Product Features

• 500V isolated serial channel

• RS232 with RTS/CTS flow control

• XON/XOFF software flow control

• 300, 600, 1200, 2400, 4800, 9600, 19200 bps serial data rates

• Configurable parity

• 64 byte transmit and receive FIFO buffers

• Powered from DeviceNet 24VDC

• Loss-of-ground protection circuitry

• DeviceNet slave mode supports POLL and EXPLICIT messages

• Rotary switches set DeviceNet baud rate and MAC ID

• Rotary switch sets serial data rate

• 4 bi-color status LEDs

• Encapsulated circuit board in compact industrial case

ounting Holes

DeviceNet Channel

male 5-pin micro connector

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DN120 DeviceNet Gateway User’s Manual

Chapter 2 – Installation

This chapter describes how to install and connect the DN120 gateway to a DeviceNet network and your serial device.

Mounting

Mount on a horizontal or vertical surface. While the RTV encapsulation protects its circuitry, the DN120 serial channel connector is not rated for NEMA4 / IP65 environments. Mount the gateway in a suitable location or enclosure for your application. The gateway will generate up to

1.4W of heat, so provide sufficient clearance and airflow to maintain 0°C to 70°C operating temperature range. Use two screws (not provided) in the 0.19 inch mounting holes shown below to fasten the DN120 to the mounting surface.

1.25

ll dimensions

are inches

0.65 0.45

3.80

4.30

3.30

0.50

0.12 Mtg. Ho les 1.225 (2) 0.19 DIA.

0.725

0.625 DIA. On Case Wall

1.225

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0.70

0.542

1.10

DN120 DeviceNet Gateway User’s Manual

Wiring

The DN120 requires two connections – one to the DeviceNet network (male 5-pin micro connector) and one to the target serial device (male DB9 connector). Follow all applicable electrical codes in your area when mounting and wiring any electrical device.

All power is received from the DeviceNet network. The DN120 draws up to 50mA from the 24VDC power supply. Select your DeviceNet cables and power supply so that it can provide sufficient current for all networked devices at their peak operating power.

DeviceNet Interface

Male 5-Pin Micro Connector

V+

V-

PIN SIGNAL COLOR DESCRIPTION 1 DRAIN NONE Cable shield or drain wire. 2 V+ RED DeviceNet 24VDC(+) power. 3 V- BLACK DeviceNet 24VDC(-) power. 4 CAN_H WHITE Communication signal. 5 CAN_L BLUE Communication signal.

Serial Channel Interface

Male DB9 Serial Connector

DN120 (RS232)

PIN SIGNAL DESCRIPTION 1 NC No Connect. Do not connect any wires to NC pins. 2 RXD Receive Data. RS232 input signal. 3 TXD Transmit Data. RS232 output signal. 4 NC No Connect. 5 GND Ground. Common for RS232 signals. 6 NC No Connect. 7 RTS Request To Send. RS232 output signal. 8 CTS Clear To Send. RS232 input signal. 9 NC No Connect.

DRAIN CAN_L CAN

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DN120 DeviceNet Gateway User’s Manual

Wiring Examples

The following are typical DN120 gateway wiring configurations. Your RS232 or RS422/485 interface may vary. Refer to your device’s documentation for the required data and control signals.

Simple RS232 Interface

RS232

Serial

Device

RXD

TXD

GND

RXD

TXD

GND

DN120

DRAIN

VDC+

VDC-

CAN H

CAN L

RS232 Interface, HW Flow Control

RS232

Serial

Device

RXD

TXD

GND

RTS

CTS

RXD

TXD

GND

RTS

CTS

DN120

DRAIN

VDC+

VDC-

CAN H

CAN L

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DN120 DeviceNet Gateway User’s Manual

Chapter 3 – Theory of Operation

This chapter describes how the DN120 gateway operates. You should have a working knowledge of DeviceNet and asynchronous serial communications before continuing. The Open DeviceNet Vendors Association (www.odva.com) is a good source for general DeviceNet information. Refer to your serial device documentation for its protocol information.

Gateway Operation

The DN120 gateway receives asynchronous serial messages over its serial channel and returns the received bytes as input data to the DeviceNet master. The gateway transmits bytes sent as output data from the DeviceNet master out its serial channel. The following diagram shows the major gateway components.

DC:DC Power Conversion

• 24VDC DeviceNet power input

DeviceNet Poll Command

output data

• VDC for Core & DeviceNet channel

• isolated VDC for serial channel

5-pin male

micro connector

DeviceNet Poll Response

input data

DeviceNet Channel

• 24VDC power

• communications

DeviceNet Object

or Rotary Switches

Configures the DeviceNet interface baud rate and

AC ID address.

Gateway Core

• microcontroller

• RAM

• Flash ROM

Serial Channel

• communications

• flow control

Serial Stream Object

Configures the serial channel.

eceives and transmits seria messages. Controls optional synchronization.

Male DB9 connector

serial

messages

DeviceNet Object Model

The DeviceNet Specification defines an Object Model that consists of Objects and Attributes. An Object is a predefined software process, and an Object Attribute is a data value used or generated by that process. An Object Instance is one occurrence of an Object, operating on its unique set of Attribute values. The DN120 gateway has six different Object Classes, or types.

Five are standard objects defined by the DeviceNet Specification (Identity, Router, DeviceNet,

Assembly, Connection). One is a device-specific object defined for the DN120 gateway (Serial Stream). The Serial Stream Object configures and controls the serial channel. It receives and

packages serial data into DeviceNet input bytes, and transmits DeviceNet output bytes as serial data. Chapter 5 contains detailed information on each DeviceNet object class, instance, and their associated attributes.

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DN120 DeviceNet Gateway User’s Manual

DeviceNet Interface

The DN120 gateway operates as a DeviceNet slave. It supports Explicit Messages and Polled I/O Messages of the predefined master/slave connection set. The Explicit Unconnected Message Manager (UCMM) is not supported.

There are four independent processes operating in a DN120 gateway application. The first process is the exchange of input and output data between the user application program and the DeviceNet master. The second process is the exchange of input and output data between the gateway and DeviceNet master, using Polled I/O messaging. The third process is receiving serial messages and converting it to input data. The fourth process is converting output data and transmitting it as serial messages.

The DeviceNet Polled I/O Message process consists of the DeviceNet master sending output data to the DN120 in the form of a Poll Command message, and the DN120 returning input data to the DeviceNet master in a Poll Response message. The output and input data bytes are typically mapped into data files inside the DeviceNet master. These data files are exchanged with the user application program. The application processes the received input data from the gateway and writes new output data to the DeviceNet master, which sends them to the gateway.

The Polled I/O data exchange typically occurs at a faster rate than the serial transmit and receive operation, because the DeviceNet baud rate is much greater than the serial channel baud rate. The DN120 has transmit and receive buffers to handle the slower serial processes. The gateway also provides synchronization features to ensure delivery of received messages to the application program, and transmission of application messages out the serial channel.

DeviceNet Poll Response

input data

DeviceNet Poll Command

output data

DeviceNet

Master

Application

Program

DN120

Gateway

Receive

Message Packet

Transmit

Message Packet

Serial

Device

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DN120 DeviceNet Gateway User’s Manual

The DN120 configuration defines the number of output bytes in a Poll Command message, and the number of input bytes in a Poll Response message. Each Poll Command and Poll Response message can contain up to 2 overhead bytes for DN120 status and data synchronization information. The remaining bytes contain output data to be transmitted out the serial channel, or input data received by the serial channel.

The following diagram shows how the input and output bytes map into the Poll Response and Poll Command messages. The gateway supports a maximum of 67 output bytes in a Poll Command message, and a maximum of 67 input bytes in a Poll Response message.

DeviceNet Master Mapping of DeviceNet Poll Command and Poll Response Data

DeviceNet Master Outputs DeviceNet Poll Command Message Data

Status Clear

output bytes

output byte output byte output byte output byte output byte output byte output byte output byte output byte output byte output byte

output bytes

DeviceNet Master Inputs DeviceNet Poll Response Message Data

input bytes

input byte input byte input byte input byte input byte input byte input byte input byte input byte input byte input byte

input bytes

(if enabled)

Status

(if enabled)

TX Sequence Number (if

enabled)

RX Sequence Nu mber (if

enabled)

Other Output Bytes

(1-65 bytes)

Other Input Bytes

(1-65 bytes)

Serial Channel Interface

The DN120 serial channel consists of an asynchronous serial transmitter and receiver. The serial

interface is configured and controlled by the Serial Stream Object. The Serial Stream Object

attributes configure the serial channel baud rate, parity, and flow control. This configuration applies to both the serial transmitter and receiver. The DN120 gateway has separate 64-byte serial transmit and receive FIFO buffers, allowing full duplex operation when supported by the physical layer media.

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DN120 DeviceNet Gateway User’s Manual

Asynchronous Serial Communication

Devices communicating on an asynchronous serial link exchange information one bit at a time. Each bit is transmitted for a specific period of time, defined by the baud rate. Devices use internal timing circuitry to generate the baud rate. There is no clocking signal between devices

to synchronize the serial data flow, hence the term asynchronous serial communications.

Serial data bits are organized into bytes. When a data byte is asynchronously transmitted, it is preceded by a start bit, followed by the data bits, an optional parity bit, and one or more stop bits. There can be a variable transmission delay between successive data bytes, since each byte is framed by its own start and stop bits. The receiver starts saving bits after is receives a valid start bit (0), and stops when it receives the expected number of stop bits (1). The data byte’s leastsignificant bit is transmitted first (data bit 0), and the most-significant bit is last (data bit N).

[ start bit ] [ data bit 0 ] [ data bit 1 ] … [ data bit N ] [ optional parity bit ] [ stop bit(s) ]

The parity bit detects single-bit errors in the transmission. The parity bit is calculated and inserted by the transmitter. The receiver calculates the parity of an incoming byte, and compares it to the parity bit sent by the transmitter. If the two bit values do not match, then at least one serial bit value was corrupted during transmission.

Flow control enables the receiving device to regulate the rate of incoming data. Hardware flow control uses RTS/CTS signals between the devices to control the rate of transmission. Software flow control uses serial characters XON/OFF to control the rate. CTS Detect Mode uses the CTS signal to enable serial communications. Flow control helps prevent data loss, if the receiving device cannot store incoming data fast enough, or if its Receive Buffer is full and cannot accept more data until existing data is processed.

The DN120 supports baud rates from 300 to 19200 bits per second. It supports 8 data bits with no parity, 7 data bits with parity, and 1 stop bit. The DN120 model supports RTS/CTS, XON/XOFF, and CTS Detect Mode flow control options.

Status Information

The gateway can be configured to return serial channel status information in the Poll Response message, and receive error-clearing commands in the Poll Command message. When enabled,

the Status byte is returned as an input byte, and the Status Clear byte is received as an output

byte. These bytes contain 8 status bits, defined below. Each bit represents either an error or state condition for the serial transmitter and receiver. Clearing the associated error bit in the

Status Clear output byte will reset Receive Parity Error, Receive Buffer Overflow, Framing

Error, and Transmit Buffer Overflow error conditions.

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Status / Status Clear Bytes

DN120 DeviceNet Gateway User’s Manual

Bit Status (1st input byte) Status Clear (1st output byte) 0 Transmit Channel Blocked not used 1 Transmit Buffer Empty not used 2 Receive Parity Error Set = 0 to clear Receive Parity Error condition 3 Receive Buffer Empty not used 4 Receive Buffer Overflow Set = 0 to clear Receive Buffer Overflow condition 5 Framing Error Set = 0 to clear Framing Error condition 6 Transmit Buffer Overflow Set = 0 to clear Transmit Buffer Overflow condition 7 CTS Signal State (1 = asserted) not used

A user application can use the Transmit Buffer Empty and Receive Buffer Empty status bits to monitor the transmitter and receiver states. However, the DN120 gateway also has three data

synchronization features (Receive Sequence Number, Transmit Sequence Number, Handshake

Protocol) that an application can use to better monitor the serial operations. Receiving Messages

The DN120 gateway has two modes for receiving serial data: Stream Mode and Block Mode. Stream Mode is best suited for applications with fixed-length serial messages, but it can also be

used to capture any stream of serial data. Block Mode is intended for both fixed and variable- length message applications, where a Delimiter byte denotes the beginning or end of a message.

Stream Mode

Stream Mode saves all received message bytes in the Receive Buffer. There is no defined beginning or end to the message stream. The only limitation is the gateway must send bytes

from the Receive Buffer to the DeviceNet master (Poll Response message) faster than it saves new message bytes in the Receive Buffer, or the 64-byte buffer may eventually overflow.

Incoming data stream

Stream Mode

0x45 0x62 0x02 0x31 0x32 0x32 0x42 0x45 0x02 0x42 0x43 0x44 …

essage Bytes

Block Mode

Block Mode uses a configurable Delimiter byte to signal the start or end of a new message packet. The Delimiter cannot be used in any other part of the message, or it would be incorrectly interpreted as the start or end of a message. The gateway can be configured to save the Delimiter byte in the Receive Buffer, or discard it. In Block Mode, the gateway does not return any new

message data to the DeviceNet master until the entire serial message has been received.

The Pre-Delimiter Block Mode configuration expects the Delimiter at the start of a message. When a Delimiter byte is received, the gateway saves all subsequent bytes in the Receive Buffer until another Delimiter is received (signaling the start of another message), or until the Maximum

Receive Size number of bytes has been saved. All bytes received after the Maximum Receive Size and before the next Delimiter are discarded. In this mode, the maximum number of bytes in a single message is defined by the Maximum Receive Size attribute.

Incoming data stream

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0x45 0x62 0x02 0x31 0x32 0x32 0x42 0x45 0x02 0x42 0x43 0x44 …

DN120 DeviceNet Gateway User’s Manual

Pre-Delimiter Mode

0x02 0x31 0x32 0x32 0x42 0x45

0x02 0x42 0x43 0x44 …

elimiter = 0x02

elimite

essage Bytes

elimite

essage Bytes

The Post-Delimiter Block Mode configuration expects the Delimiter at the end of a message. The gateway saves all received bytes in the Receive Buffer until a Delimiter is received. In this

mode, the maximum number of bytes in a single message is limited by the Receive Buffer size

(64 bytes), not the Maximum Receive Size attribute.

Incoming data stream

Post-Delimiter Mode

elimiter = 0x02

0x45 0x62 0x02 0x31 0x32 0x32 0x42 0x45 0x02 0x42 0x43 0x44 …

0x45 0x62

essage Bytes

0x02

elimite

0x31 0x32 0x32f 0x42 0x45

essage Bytes

0x02

elimite

0x42 0x43 0x44 …

essage Bytes

Returning Received Data

When the gateway receives a Poll Command message, it removes some or all of the bytes currently in the Receive Buffer and returns them as input bytes in a Poll Response message.

The Maximum Receive Size attribute defines the maximum number of bytes that can be returned

in a single Poll Response message. If the Receive Buffer contains more bytes than can fit into one Poll Response message, the remaining bytes are returned in subsequent Poll Response

messages. RX Message is the string of valid message bytes returned in a single Poll Response message. The RX Message byte string can be formatted as either a Short_String (byte array with

byte = length) or a Byte Array (no length byte). The number of bytes in an RX Message string

can be less than or equal to the Maximum Receive Size, but never larger. When the number is

less, the remaining Poll Response input bytes are either padded or undefined.

In Stream Mode, the gateway will always try to fill Poll Response message with bytes from the Receive Buffer. The only time the RX Message size is less than the Maximum Receive Size is

when there are no more bytes in the Receive Buffer.

In Block Mode, the gateway will not return any data in a Poll Response message unless it has a

complete serial message saved in the Receive Buffer. If the message sizes are small, the gateway may have several messages saved in the Receive Buffer, depending upon how fast the DeviceNet master polls the gateway for data. The messages are returned one at a time in a Poll Response message, regardless of their size. If the message is large, then it is returned in multiple Poll Response messages.

Padding Message Data

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DN120 DeviceNet Gateway User’s Manual

If the number of RX Message bytes currently in the Receive Buffer is less than the Maximum Receive Size number, then the remaining input bytes are undefined. The gateway can optionally

fill the unused input bytes with a Pad character. The Pad characters can be added at the

beginning or end of the message.

oll Response Message Data

Status

1. The are enough message bytes in Receive uffer to fill Poll Response.

2. The are not enough message bytes in eceive Buffer to fill Poll Response. Unused

input bytes are undefined.

3. The are not enough message bytes in eceive Buffer to fill Poll Response. Pad bytes

are added after message bytes.

4. The are not enough message bytes in eceive Buffer to fill Poll Response. Pad bytes

are added before message bytes.

eceive Sequence Numbe

other input bytes

RX Message bytes

RX Message bytes undefined

RX Message bytes

Pad Bytes

RX Message Bytes

Pad Bytes

If configured for Pre-Delimiter Block Mode and the Delimiter byte is saved, the Pad characters are added either after the last valid message byte (right justification) or before the Delimiter byte

(left justification).

If configured for Post-Delimiter Block Mode and the Delimiter byte is saved, the Pad characters

are added either before the first valid message byte (left justification), or after the last valid

message byte but before the Delimiter byte (right justification).

Re-sending Received Data

The DN120 gateway can be configured to return received message bytes only once in a Poll Response message, and return no data (null value) in subsequent Poll Response messages until new message bytes are received. For the Short_String data type, a null value consists of the length byte = 0. For the Byte Array data type, a null value consists of no data.

The gateway can also be configured to always return received message bytes in a Poll Response message. If no new bytes in the Receive Buffer, then the last received bytes are returned. If new

bytes are in the Receive Buffer, then they are returned. The gateway provides Receive Sequence Number or Handshake Protocol synchronization options to indicate whether the returned bytes

represent old or new data.

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DN120 DeviceNet Gateway User’s Manual

Transmitting Messages

The Serial Stream Object receives output bytes (TX Message) from the DeviceNet master in a

Poll Command message. It saves the output bytes in the Transmit Buffer, to be transmitted when the serial channel is available. The maximum number of bytes that can be sent in one Poll

Command message is defined by the Maximum Transmit Size attribute. The Transmit Buffer can

hold up to 64 bytes. Because the DeviceNet Polled I/O data exchange may occur many times faster than the transmission of serial data, the application may need to synchronize the transmit data exchange with the gateway.

The number of output bytes in the Poll Command message is fixed. The Status Clear and Transmit Sequence Number bytes are always sent, if enabled. The remaining number of bytes in the Poll Command is defined by the Maximum Transmit Size attribute. If the number of TX Message bytes sent is less than the Maximum Transmit Size number, then the remaining output

bytes are undefined. The gateway uses the Short_String length to determine the valid number of bytes to transmit. If Byte Array format is used, all the bytes are transmitted.

oll Command Message Data

Status Clear Transmit Sequence Number other output bytes

1. TX Message bytes fill Poll Command

message.

2. TX Message is smaller than Poll Command

message. Unused output bytes are undefined.

TX Message bytes

TX Message bytes undefined

Synchronization

To ensure that no information is lost between the gateway’s serial channel and the user

application program, the DN120 has three synchronization options: Receive Sequence Number, Transmit Sequence Number, and Handshake Protocol.

Receive Sequence Number

When enabled, the gateway returns a Receive Sequence Number input byte in the DeviceNet Poll Response message. The 8-bit Receive Sequence Number is incremented by the gateway whenever it returns new data in the input bytes. The user application uses the Receive Sequence Number to signal the receipt of new message data. Valid numbers are 0-255.

Transmit Sequence Number

When enabled, the gateway receives a Transmit Sequence Number output byte in the DeviceNet Poll Command message. The gateway will not send the TX Message bytes out the serial channel unless the 8-bit Transmit Sequence Number is different than the last received value. Valid

numbers are 0-255.

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DN120 DeviceNet Gateway User’s Manual

Synchronous Handshake Protocol

The gateway can be configured with a more robust transmit and receive synchronization process.

The Handshake protocol requires the user application to acknowledge the receipt of new RX Message input bytes. The protocol also requires the gateway to acknowledge the transmission of the last TX Message output bytes. When enabled, both the Receive Sequence Number input byte and Transmit Sequence Number output byte are used. They are segmented into four 4-bit

numbers, shown below. Valid numbers are 1 to 15, with 0 reserved to reset the gateway’s numbers.

Transmit Sequence Number byte

Receive Acknowledge Number Transmit Request Number

Bits 4-7 (upper nibble) Bits 0-3 (lower nibble)

eceive Sequence Number byte

Receive Request Number Transmit Acknowledge Number

Bits 4-7 (upper nibble) Bits 0-3 (lower nibble)

The Receive Request Number is incremented by the gateway when it returns new RX Message

input bytes in the Poll Response Message. The gateway will increment from 15 to 1, skipping 0.

The user application acknowledges receipt of this RX Message by setting the Receive

Acknowledge Number equal to the Receive Request Number. The updated Receive Acknowledge Number is sent back to the gateway in the next Poll Command Message. When the Receive Acknowledge Number equals the Receive Request Number, the gateway can return the next set of RX Message. If the user application sends 0 as the Receive Acknowledge Number, the gateway

resets its Receive Request Number to 0.

The following ladder-logic rung shows how the user application program can monitor the

gateway’s Receive Request Number (RX Rqst Num), save the new RX Message bytes, and set Receive Acknowledge Number (RX Ack Num) equal to Receive Request Number (RX Rqst

Num).

id gateway increment the RX Rqs um, indicating new data?

Compare Function: RX Rqst Num <> RX Ack Num

Copy Function: <byte array> = RX Message

Copy Function: RX Ack Num = RX Rqst Num

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DN120 DeviceNet Gateway User’s Manual

The Transmit Request Number is incremented by the user application when it sends new TX Message output bytes in the Poll Command Message. After the gateway transmits these TX Message bytes, it sets the Transmit Acknowledge Number equal to the Transmit Request Number,

acknowledging the transmission. The updated Transmit Acknowledge Number is returned in the next Poll Response Message. If the user application sends 0 as the Transmit Request Number, the gateway ignores the TX Message output bytes and resets its Transmit Acknowledge Number

to 0.

The following ladder-logic rungs show how the user application program writes a new TX

Message value, increments the Transmit Request Number (TX Rqst Num), and waits for the Transmit Acknowledge Number (TX Ack Num) to equal the Transmit Request Number (TX Rqst Num). Note the application must wrap the Transmit Request Number from 15 to 1.

id gateway finish (acknowledge)

transmitting the last message?

Compare Function: TX Ack Num == TX Rqst Num

Write next output bytes to transmit.

Copy Function: TX Message = <byte array>

f TX Rqst Number greater than 15,

then reset number to 1 (1-15 range)

Compare Function: TX Rqst Num == 16

ncrement TX Rqst Num (new data)

Addition Function: TX Rqst Num = TX Rqst Num + 1

Write Function: TX Rqst Num = 1

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DN120 DeviceNet Gateway User’s Manual

Chapter 4 – Gateway Configuration

This chapter describes how to configure and operate the DN120 gateway. You configure the gateway by reading and writing attribute values over its DeviceNet interface. There are a variety of DeviceNet configuration tools available. Simple configuration tools use GET_ATTRIBUTE and SET_ATTRIBUTE explicit message commands to read and write attribute values, addressing each attribute by its Object, Instance, and Attribute numbers. This information is contained in Chapter 5. More sophisticated configuration tools use EDS files to simplify attribute configuration. You can configure the gateway using pull-down menus, buttons, and data entry fields from the gateway’s Electronic Data sheet (EDS) file. Chapter 6 contains a configuration example using the Rockwell Software RSNetworx program.

Configure DeviceNet Interface

Set the DeviceNet Baud Rate and MAC ID Address using the rotary switches. Configure switches before connecting to the DeviceNet network. There is either a small triangular indicator or white indicator on the switch. Use a small screwdriver to align that indicator with the desired setting. Remove the DN120 cover if necessary to access the rotary switches.

DeviceNet Baud Rate Switch

Valid settings are 125K, 250K, 500K, or PGM. When PGM is selected, the DN120 uses the baud rate saved in its retentive memory. A valid baud rate must be stored before the PGM selection can be used. The baud rate is stored from the previous DN120 power cycle. It can also be set over the network (DeviceNet Object Baud Rate attribute).

POSITION SETTING POSITION SETTING 0 125 Kbps 5 invalid 1 250 Kbps 6 invalid 2 500 Kbps 7 invalid 3 invalid 8 invalid 4invalid 9PGM

MAC ID Switches

The two MAC ID switches represent decimal numbers from 00 to 99. The LSB switch selects

the Ones digit and the MSB switch selects the Tens digit. Valid MAC IDs are 00 to 63. Setting

a MAC ID address greater than 63 forces the gateway to use the MAC ID saved in retentive memory. A valid MAC ID must first be stored before this feature can be used. The MAC ID is stored from the previous DN120 power cycle. It can also be set over the network (DeviceNet Object MAC ID attribute).

MSB LSB Address MSB LSB Address 0 0 to 9 00 to 09 6 4 to 9 stored address 1 0 to 9 10 to 19 7 0 to 3 stored address 2 0 to 9 20 to 29 8 0 to 9 stored address 3 0 to 9 30 to 39 9 0 to 9 stored address 4 0 to 9 40 to 49 5 0 to 9 50 to 59 6 0 to 3 60 to 63

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Serial Channel Baud Rate / Option Switch

The DN120 gateway has a rotary switch for the serial channel. This switch has different functions for the DN120 models.

The DN120 model uses the rotary switch to select the RS232 channel baud rate. Valid settings are 300, 600, 1200, 2400, 4800, 9600, 19200 bits per second, and PRG (table below). When

PRG is selected, the DN120 uses the Baud Rate attribute in the Serial Stream Object. A valid

baud rate must be written over DeviceNet to this attribute.

POSITION SETTING POSITION SETTING 0 9600 bps 5 300 bps 1 4800 bps 6 19200 bps 2 2400 bps 7 invalid 3 1200 bps 8 invalid 4 600 bps 9 PRG

Power Up Gateway

Connect the gateway to a DeviceNet network to power up the gateway.

DeviceNet Status LEDs

The DN120 gateway has two bi-color status LEDs (NET and MOD) that indicate operational

status. During power-up, the LEDs cycle through a sequence of alternating red and green. After

power-up, the NET LED should be flashing green (or solid green if allocated to a DeviceNet master) and the MOD LED should be solid green. If this does not occur, disconnect from

DeviceNet and verify all the switch settings. See Chapter 8 for additional troubleshooting topics.

State DeviceNet Status LED (NET)

Off No power.

Flashing Red Configuration error. Check DeviceNet switch settings.

Solid Red Unrecoverable error.

Flashing Green Device not allocated to a DeviceNet master.

Solid Green Normal runtime, device allocated as a slave.

State Module Status LED (MOD)

Off No power.

Flashing Red Configuration error. Check object attribute settings.

Solid Red Unrecoverable error.

Flashing Green Not defined.

Solid Green Normal Operation.

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Serial Channel Status LEDs

The gateway has two bi-color LEDs to indicate serial channel activity. The TX LED flashes green when a packet is being transmitted. The RX LED flashes green when a packet is being

received. A fault is indicated by solid red. After power-up, both LEDs should be off.

State Transmit Status LED (TX)

Off No data being transmitted

Flashing Red Not defined

Solid Red Transmit error (parity or overrun error)

Flashing Green Data being transmitted

Solid Green Not defined

State Receive Status LED (RX)

Off No data being received

Flashing Red Not defined

Solid Red Receive error (parity or overrun error)

Flashing Green Data being received

Solid Green Not defined

If using a DeviceNet configuration tool that supports Electronic Data Sheet (EDS) files, you should now register the gateway’s EDS file with the software. The latest EDS file versions can be downloaded from www.mksinst.com. Select the EDS file that matches your gateway’s part number and firmware version. Follow your configuration tool instructions to register EDS file.

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Configure Serial Channel

The Serial Stream Object attributes control the DN120 serial channel. These settings apply to all

serial transmit and receive operations. Before you can set or change any gateway configuration settings, make sure the gateway is not in the DeviceNet master scanlist.

Serial Stream Object Instance Attributes (Class Code 64)

Number Name Data Type Value

3 Receive Data Short_String

Byte Array

4 Transmit Data Short_String

Byte Array

5 Status USINT Bit 0 – Transmit Channel Blocked

6 Baud Rate USINT 0 = 9600 bps 4 = 600 bps

7 Parity USINT 0 = no parity 5 = mark (force to 1)

8 Data Size USINT Read-only. 7 bits if parity enabled, 8 bits if no parity. 9 Stop Bits USINT Read-only. Fixed at 1 bit.

10 Flow Control USINT 0 = none 2 = CTS / RTS

11 Receive Count USINT Number of bytes in Receive Buffer. Any write clears buffer. 12 Transmit Count USINT Number of bytes in Transmit Buffer. Any write clears buffer. 13 Maximum Receive Size USINT Defines the maximum #bytes returned by RX Message read. 14 Data Format USINT Bit 0 – String Format (0 = Short_String, 1 = Byte Array)

15 Block Mode USINT Bit 0 – Pre/Post Delimiter (0 = pre-delimiter, 1 = post-delimiter)

16 Delimiter USINT Delimiter byte value 17 Pad Character CHAR Pad byte value 18 Maximum Transmit Size USINT Defines the maximum # bytes that can be transmitted. 19 Idle String Short_String 1-16 byte string transmitted when gateway receives a null Poll

Received message data. Returned in Poll Response Message.

Message data to transmit. Received in Poll Command Message.

Bit 1 – Transmit Buffer Empty Bit 2 – Receive Parity Error (set = 0 to clear) Bit 3 – Receive Buffer Empty Bit 4 – Receive Buffer Overflow Error (set = 0 to clear) Bit 5 – Framing Error (set = 0 to clear) Bit 6 – Transmit Buffer Overflow Error (set = 0 to clear) Bit 7 – CTS Signal State (1 = asserted)

1 = 4800 bps 5 = 300 bps 2 = 2400 bps 6 = 19200 bps 3 = 1200 bps

1 = even parity 6 = space (force to 0) 2 = odd parity

1 = XON / XOFF 4 = CTS Detect Mode

Bit 1 – Strip Parity Bits (0 = retain, 1 = strip) Bit 2 – Pad Justification (0 = left justify, 1 = right justify) Bit 3 – Pad Received Message (0 = no, 1 = yes)

Bit 1 – Strip Delimiter (0 = keep delimiter, 1 = strip delimiter) Bit 2 – Delimiter Enable (0 = no, 1 = yes) Bit 3 – Enable Receive Sequence Number (0 = no, 1 = yes) Bit 4 – Enable Transmit Sequence Number (0 = no, 1 = yes) Bit 5 – Re-send (0 = no, 1 = yes) Bit 6 – Synchronization (0 = no, 1 = handshake protocol)

(no input bytes). Short_String length = 0 for no Idle String.

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20 Fault String Short_String 1-16 byte string transmitted when gateway’s Polled I/O

connection times out. Short_String length = 0 for no Fault String.

21 Status Enable USINT Set to any nonzero value to enable Status input byte. 22 Status Clear Enable USINT Set to any nonzero value to enable Status Clear output byte. 23 Four Wire USINT NA 24 Option Switch USINT NA

Receive Data – Data from the last valid message packet. Receive Data includes the Status and Receive Sequence Number bytes if enabled, and the RX Message bytes. The RX Message format

is either Short_String or Byte Array, defined by Data Format attribute. If no message data is available, the RX Message will be a null packet or Short_String with length = 0. Receive Data is

returned in the DeviceNet Poll Response Message.

eceive Data

Status

eceive Sequence Numbe

ata Format =

xxxxxxx0

Short_String data bytes Byte Array data bytesLength

RX Message

ata Format =

xxxxxxx1

Transmit Data – Data to transmit out the serial channel by the gateway. Transmit Data includes the Status Clear and Transmit Sequence Number bytes if enabled, and the TX Message bytes. Format is either Short_String or Byte Array, defined by Data Format attribute. Transmit Data is typically received in the DeviceNet Poll Command Message. Reading Transmit Data returns the

last byte in the Transmit Buffer.

Transmit Data

Status Clear Transmit Sequence Number TX Message

ata Format =

xxxxxxx0

Short_String data bytes Byte Array data bytesLength

ata Format =

xxxxxxx1

Status – Contains bit-mapped serial channel status and error bits for transmit and receive

operations. Clearing the bits indicated will clear the error condition.

Baud Rate – Sets the serial channel’s data or baud rate. Enter number from 1-6 to select

corresponding baud rate value. For DN120, the RS232 Baud Rate switch must be set to PRG before this attribute can be used to set the baud rate.

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Parity – Selects the parity type used in the serial byte.

Data Size – Read-only attribute indicates number of data bits in one serial byte. This number

does not include start, parity, or stop bits. If parity is enabled, 7 data bits are used. If no parity, 8 data bits are used.

Stop Bits – Read-only attribute indicates number of stop bits in one serial byte. Fixed at 1.

Flow Control – Selects the method of flow control used across the serial interface.

NONE means there is no flow control over the serial data exchange. The transmitting device can

overflow the receiving device’s buffer.

XON/XOFF is a software flow control option. Receiving device sends an XOFF character to the

transmitting device when its buffer is full, stopping further transmission. It sends an XON character when it can again receive data. The XOFF and XON characters are not saved as message data.

CTS/RTS is an RS232 hardware flow control option, available only on the DN120 gateway. The

RTS is an output and CTS is an input signal. The gateway keeps RTS active (low) when it can receive data. It only transmits data when CTS is active (low).

CTS Detect Mode is an RS232 hardware flow control option, available only on the DN120 gateway. When CTS is asserted, the DN120 serial channel can transmit and receive. When CTS is not asserted, the DN120 serial channel is disabled and Receive Buffer cleared.

Receive Count – Number of bytes currently available in the Receive Buffer. Writing any value

to this attribute will clear the Receive Buffer.

Transmit Count – Number of bytes currently in the Transmit Buffer. Writing any value to this

attribute will clear the Transmit Buffer.

Maximum Receive Size – Defines the maximum number of data bytes to be returned when the

Receive Buffer is read using either an Explicit Message or a Poll Response Message.

Data Format – Control byte that defines the format of the TX Message and RX Message bytes

transferred across DeviceNet.

Bit 3 selects whether the RX Message bytes are padded with the Pad bytes. Set this bit = 1 to enable. If there are not enough message bytes in the Receive Buffer to fill up the RX Message

input bytes, then Pad characters are added at either the beginning or end of the message bytes.

Bit 2 selects whether Pad bytes are added at the beginning of the message (0 = left justify) or at the end of the message (1 = right justify). This bit is used only if the Pad option is enabled.

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Bit 1 defines whether the gateway saves the parity bit in received message bytes (set = 0), or if the gateway forces the parity bit to 0 in received message bytes (set = 1). This is typically used when receiving 7-bit ASCII data.

Bit 0 defines String Format for TX Message and RX Message byte strings. Set to 0 for

Short_String format, and 1 for Byte Array format. Short_String defines the first byte as an explicit length byte, containing the number of bytes that follow. Byte Array has an implied

length, derived from the Maximum Receive Size attribute.

Block Mode – Control byte that defines the serial receive mode, synchronization mode, and re-

send message option.

Bit 6 enables the Handshake Protocol synchronization option. When enabled, the Receive Sequence Number byte is added to Receive Data input bytes, and the Transmit Sequence Number byte is added to the Transmit Data output bytes.

Bit 5 enables the re-send message option. When enabled, the gateway continuously returns RX Message data in the Poll Response message. If no new data has been received, then the last data

bytes are returned.

Bit 4 enables the Transmit Sequence Number synchronization option. When enabled, the Transmit Sequence Number byte is added to the Transmit Data output bytes.

Bit 3 enables the Receive Sequence Number synchronization option. When enabled, the Receive Sequence Number byte is added to the Receive Data output bytes.

Bit 2 selects the serial receive mode. Set = 0 for Stream Mode, and set = 1 for Block Mode.

Bit 1 selects whether the Delimiter is saved in the Receive Buffer (set = 0), or it is discarded (set

= 1). This bit is only used when Block Mode is enabled.

Bit 0 selects Pre-Delimiter Mode (set = 0) or Post-Delimiter Mode (set = 1). This bit is only used when Block Mode is enabled.

Delimiter – Byte value used to indicate the start of a new message (Pre-Delimiter Mode), or the end of a received message (Post-Delimiter Mode). This attribute is only used in Block Mode.

Pad Character – Byte value used to pad the RX Message bytes.

Maximum Transmit Size – Defines the maximum size of TX Message output bytes, or the

maximum number of data bytes to be transmitted across the RS232 channel from one Poll Command message.

Idle String – Defines the byte string that is transmitted when the gateway receives a null Poll (no

input bytes, or a Short_String value with length = 0). Enter the byte string in Short_String data

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format, with 1st byte = string length. Set the length byte to 0 if you don’t want to transmit an Idle String. The Idle String can be from 0 to 16 bytes long, not counting Short_String length byte.

Example Idle String is [ 0x01 0x41 ], where string length is 1 and data byte is 0x41 (‘A’). You must use the RSNetworx Class Instance Editor (Set Attribute Single command) to write a

Short_String attribute value.

Fault String – Defines the byte string that is transmitted when the gateway’s connection to the

DeviceNet master times out. Enter the byte string in Short_String data format, with 1

byte = string length. Set the length byte to 0 if you don’t want to transmit a Fault String. The Fault String can be from 0 to 16 bytes long, not counting Short_String length byte.

Example Fault String is [ 0x02 0x42 0x43 ], where string length is 2 and data bytes are 0x42 (‘B’) and 0x43 (‘C’). You must use the RSNetworx Class Instance Editor (Set Attribute

Single command) to write a Short_String attribute value.

Status Enable – Write any nonzero value to include the Status byte in Receive Data input bytes.

Status Clear Enable – Write any nonzero value to include the Status Clear byte in Transmit

Data output bytes.

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DN120 DeviceNet Gateway User’s Manual

Configure DeviceNet Master Scan List

You must calculate the number of input and output bytes required by your DN120 configuration before you can add the gateway to the DeviceNet master scanlist. You need to configure the DeviceNet master to send the specific number of output bytes in its Poll Command Message, and receive the specific number of input bytes in the gateway’s Poll Response Message. Once the input and output bytes are mapped in the DeviceNet master, the user application program will be able to read and write data values to the input and output bytes.

Poll Consume Size

The Poll Consume Size is the size (in bytes) of the Poll Command Message data field that is sent

by the DeviceNet master to the DN120.

Poll Command data: [Status Clear byte][Transmit Sequence Number byte][Short_String length byte][TX data bytes (0-64)]

The first 3 bytes are present if enabled. The following equation is used to calculate the DN120

Poll Consume Size. Only include the overhead bytes that are enabled.

Status Clear byte 1 Transmit Sequence Number byte 1 Short_String length byte 1

+ Maximum Transmit Size ____

Poll Consume Size ____

Poll Produce Size

The Poll Produce Size is the size (in bytes) of the Poll Response Message data field that is sent

from the DN120 to the DeviceNet master.

Poll Response data: [Status byte][Receive Sequence Number byte][Short_String length byte][RX data bytes (0-64)]

The first 3 bytes are present if enabled. The following equation is used to calculate the DN120

Poll Produce Size. Only include the overhead bytes that are enabled.

Status byte 1 Receive Sequence Number byte 1 Short_String length byte 1

+ Maximum Receive Size ____

Poll Produce Size ____

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DN120 DeviceNet Gateway User’s Manual

Chapter 5 – DeviceNet Specifications

This chapter describes the DN120 gateway DeviceNet specifications.

DeviceNet Message Types

The DN120 is a Group 2 Slave Device that supports the following message types.

CAN IDENTIFIER GROUP 2 MESSAGE TYPE

10xxxxxx111 Duplicate MAC ID Check Message 10xxxxxx110 Unconnected Explicit Request Message 10xxxxxx101 Master I/O Poll Command Message 10xxxxxx100 Master Explicit Request Message xxxxxx = DN120 MAC ID

DeviceNet Class Services

The DN120 is a Group 2 Slave Device that supports the following class services and instance services.

SERVICE CODE SERVICE NAME

05 (0x05) Reset 14 (0x0E) Get Attribute Single 16 (0x10) Set Attribute Single 75 (0x4B) Allocate Group 2 Identifier Set 76 (0x4C) Release Group 2 Identifier Set

DeviceNet Object Classes

The DN120 device supports the following DeviceNet object classes.

CLASS CODE OBJECT TYPE

01 (0x01) Identity 02 (0x02) Router 03 (0x03) DeviceNet 04 (0x04) Assembly 05 (0x05) Connection 64 (0x40) Serial Stream Object

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IDENTITY OBJECT

The Identity Object is required on all DeviceNet devices. It provides product identification and general information.

Identity Object Class Code 01 (0x01)

Class

Attribute

1 Get Revision UINT 1 2 Get Max Object Instance UINT 1 6 Get Max Class Identifier UINT 7 7 Get Max Instance Attribute UINT 7

Instance

Attribute

1 Get Vendor UINT 59 = D.I.P. Products 2 Get Product Type UINT 12 = Communications 3 Get Product Code UINT 1 4 Get Revision STRUCT of

5 Get Device Status WORD Bit 0 = owned (0 available, 1 allocated)

6 Get Serial Number UDINT Unique serial number for every device 7 Get Product Name STRUCT of

Access Name Type Value

Major Revision USINT 4 Minor Revision USINT 0

Bit 2 = configured (0 no, 1 yes) Bit 4-7 = vendor specific (0) Bit 8 = minor configuration fault Bit 9 = minor device fault Bit 10 = major configuration fault Bit 11 = major device fault Bit 1, 3, 12-15 = reserved (0)

Length USINT 6 Name STRING [6]

Common Services

Service Code Class Instance Service Name

05 (0x05) No Yes Reset 14 (0x0E) Yes Yes Get_Attribute_Single

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ROUTER OBJECT

The Message Router Object provides a messaging connection point through which a Client may address a service to any object class or instance residing in the DN120 device.

Router Object Class Code 02 (0x02)

Class

Attribute

1 Get Revision UINT 1 6 Get Max Class Identifier UINT 7 7 Get Max Instance Attribute UINT 2

Instance

Attribute

2 Get Number of Connections UINT 2

Access Name Type Value

Common Services

Service Code Class Instance Service Name

14 (0x0E) Yes Yes Get_Attribute_Single

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DEVICENET OBJECT

The DeviceNet Object contains information about the DN120 DeviceNet interface configuration.

DeviceNet Object Class Code 03 (0x03)

Class

Attribute

1 Get Revision UINT 2

Instance

Attribute

1 Get/Set MAC ID USINT Settable only if MAC ID switches > 63.

2 Get/Set Baud Rate USINT Settable only if Baud switch > 2. Valid

3 Get/Set Bus Off Interrupt BOOL 0 = hold CAN in OFF state (default)

4 Get/Set Bus Off Counter USINT Writing this attribute forces counter value

5 Get Allocation Information STRUCT of

Access Name Type Value

Valid numbers are 0 to 63. Returns last value set or switch value.

settings are 0 = 125K, 1 = 250K, 2 = 500K. Returns last value set or switch value.

1 = reset CAN

to zero.

Choice Byte BYTE bit 0 = explicit msg, set to 1 to allocate

bit 1 = polled IO, set to 1 to allocate bit 2 = strobed IO, not supported bits 3-7 = reserved, set to 0

Master Node Address USINT Allocated to this DeviceNet master

Common Services

Service Code Class Instance Service Name

14 (0x0E) Yes Yes Get_Attribute_Single 16 (0x10) No Yes Set_Attribute_Single 75 (0x4B) No Yes Allocate Master/Slave 76 (0x4C) No Yes Release Master/Slave

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ASSEMBLY OBJECT

The Assembly Object instances bind attributes of multiple objects to allow data to or from each object to be sent or received over a single connection.

Assembly Object Class Code 04 (0x04)

Class

Attribute

1 Get Revision UINT 2 2 Get Max Class ID UINT 2

Instance

Attribute

3 Get Data Stream note 1 Instance 1 for input data stream.

Access Name Type Value

Instance 2 for output data stream.

Common Services

Service Code Class Instance Service Name

14 (0x0E) Yes Yes Get_Attribute_Single 16 (0x10) No Yes Set_Attribute_Single

Instance 1 Input Data Stream and Instance 2 Output Data Stream are structured as either an array of bytes or as a Short_String consisting of a single byte length field and N data bytes. The Input Data Stream is the data returned in the Poll Response Message. The Output Data Stream is the data returned in the Poll Command Message. See Chapter 3 for a complete description of the Poll Format.

Poll Response: [Status byte][Receive Sequence Number byte][Short_String Length byte][RX data bytes]

Poll Command: [Status Clear byte][Transmit Sequence Number byte][Short_String Length byte][TX data bytes]

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CONNECTION OBJECT

The Connection Object instances manage the characteristics of each communication connection. The DN120 is a Group 2 Only Slave device that supports 1 Explicit Message Connection (Instance

1) and 1 Poll Message Connection (Instance 2).

Connection Object Class Code 05 (0x05)

Class

Attribute

1 Get Revision UINT 1

Instance

Attribute

1 Get State USINT 0 = non-existent

2 Get Instance Type USINT 0 = Explicit Message

3 Get Transport Class Trigger USINT 0x83 for Explicit Message

4 Get Production Connection UINT Explicit Message:

5 Get Consumed Connection UINT Explicit Message:

6 Get Initial Communication

7 Get Production Size UINT 67 for Explicit Message

8 Get Consumed Size UINT 71 for Explicit Message

9 Get/Set Expected Packet Rate UINT Default 2500 msec

12 Get/Set Timeout Action USINT 0 = Timeout (Explicit Message default)

13 Get Production Path Length USINT 0 for Explicit Message

14 Get Production Path STRUCT of Null for Explicit Message

15 Get Consumed Path Length USINT 0 for Explicit Message

Access Name Type Value

1 = configuring 2 = established 3 = timed out

1 = I/O Message

0x82 for I/O Message

10xxxxxx011 = produced connection id I/O Message: 01111xxxxxx = produced connection id

10xxxxxx100 = consumed connection id I/O Message: 10xxxxxx101 = consumed connection id

USINT 0x21 for Explicit Message

Characteristics

Log. Seg., Class USINT 0x20 Class Number USINT 0x04 Log. Seg., Instance USINT 0x24 Instance Number USINT 0x01 Log. Seg., Attribute USINT 0x30 Attribute Number USINT 0x03

0x01 for I/O Message

See Stream Object for I/O Message

1 = Auto Delete 2 = Auto Reset (I/O Message default)

6 for I/O Message

STRUCT for I/O Message

6 for I/O Message

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16 Get Consumed Path STRUCT of Null for Explicit Message

STRUCT for I/O Message

Log. Seg., Class USINT 0x20 Class Number USINT 0x04 Log. Seg., Instance USINT 0x24 Instance Number USINT 0x02 Log. Seg., Attribute USINT 0x30 Attribute Number USINT 0x03

17 Get Production Inhibit UINT 0

Common Services

Service Code Class Instance Service Name

05 (0x05) Yes Yes Reset 14 (0x0E) Yes Yes Get_Attribute_Single 16 (0x10) No Yes Set_Attribute_Single

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SERIAL STREAM OBJECT

The Serial Stream Object configures the DN120 serial channel.

Serial Stream Object Class Code 64 (0x40)

Class

Attribute

1 Get Revision UINT 1 2 Get Max Object Instance UINT 1 6 Get Max Class Identifier UINT 7 7 Get Max Instance Attribute UINT 22

Instance

Attribute

3 Get Receive Data Data Format Received message data. Returned in Poll Response 4 Get/Set Transmit Data Data Format Message data to transmit. Received in Poll

5 Get/Set Status USINT Bit 0 – Transmit Channel Blocked

6 Get/Set Baud Rate USINT 0 = 9600 bps 4 = 600 bps

7 Get/Set Parity USINT 0 = no parity 5 = mark (force to 1)

8 Get Data Size USINT 7 (parity enabled) or 8 (no parity) 9GetStop Bits USINT1

10 Get/Set Flow Control USINT 0 = none 2 = CTS / RTS

11 Get/Set Receive Count USINT Number of bytes in Receive Buffer. Write to clear. 12 Get/Set Transmit Count USINT Number of bytes in Transmit Buffer. Write to clear 13 Get/Set Maximum Receive Size USINT Maximum # bytes returned by Receive Buffer read.

14 Get/Set Data Format USINT Bit 0 – String Format (0 = Short_String, 1 = Array)

15 Get/Set Block Mode USINT Bit 0 – Pre/Post Delimiter (0 = Pre-, 1 = Post-)

16 Get/Set Delimiter USINT Delimiter byte value 17 Get/Set Pad Character CHAR Pad byte value 18 Get/Set Maximum Transmit Size USINT Defines maximum # bytes that can be transmitted.

Access Name Type Value

Command.

Bit 1 – Transmit Buffer Empty Bit 2 – Receive Parity Error (0 to clear) Bit 3 – Receive Buffer Empty Bit 4 – Receive Buffer Overflow Error (0 to clear) Bit 5 – Framing Error (0 to clear) Bit 6 – Transmit Buffer Overflow Error (0 to clear) Bit 7 – CTS Signal State (1 = asserted)

1 = 4800 bps 5 = 300 bps 2 = 2400 bps 6 = 19200 bps 3 = 1200 bps

1 = even parity 6 = space (force to 0) 2 = odd parity

1 = XON / XOFF 4 = CTS Detect Mode

Bit 1 – Strip Parity Bits (0 = retain, 1 = strip) Bit 2 – Pad Justification (0 = left, 1 = right) Bit 3 – Pad Received Message (0 = no, 1 = yes)

Bit 1 – Strip Delimiter (0 = keep, 1 = strip) Bit 2 – Delimiter Enable (0 = no, 1 = yes) Bit 3 – Enable Receive Sequence Number Bit 4 – Enable Transmit Sequence Number Bit 5 – Re-send (0 = no, 1 = yes) Bit 6 – Synchronization (0 = no, 1 = yes)

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19 Get/Set Idle String Short_String Byte string transmitted when gateway receives null

Poll (no input bytes). Length = 0 for no Idle String.

20 Get/Set Fault String Short_String Byte string transmitted when gateway’s Polled I/O

connection times out. Length=0 for no Fault String

21 Get/Set Status Enable USINT Nonzero value enables Status input byte. 22 Get/Set Status Clear Enable USINT Nonzero value enables Status Clear output byte.

Common Services

Service Code Class Instance Service Name

05 (0x05) No Yes Reset 14 (0x0E) Yes Yes Get_Attribute_Single 16 (0x10) No Yes Set_Attribute_Single

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DN120 DeviceNet Gateway User’s Manual

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Chapter 6 – RSNetworx Configuration Example

This chapter shows how to set up configure a DN120 gateway using the Rockwell Software RSNetworx software and your gateway’s Electronic Data Sheet (EDS) file. The system

configuration uses an Allen-Bradley 1770-KFD DeviceNet adapter (MAC ID 62) to connect the PC running RSNetworx to the DeviceNet network. A SLC500 system with a 1747-SDN

DeviceNet Scanner (MAC ID 00) is the DeviceNet master. DN120 gateway has MAC ID 03.

120VAC

Input

Fuse 1A Fuse 6A

To PC RS232 25

Pin Serial Interface

For Used with RSLo

To PC RS232 9 Serial Interface For

Used with RSLinx

& RSNetWorx Prog.

24VDC Power Supply

120VAC 24VDC

GND

ic Prog.

120/240VAC

Neutral GND

PC Interface

RS232-PLC

RS232 serial communication

PC Interface Mod.

RS232-DeviceNet

.Slot 2

24vdc output

1747-P1

Module

1747-PIC

1770-KFD

Slot 0

SLC502

PLC CPUFuse 3A

1747-L524

DeviceNet

Scanner

1747-SDN

Comm. Comm.

Slot 1

8 pt. Input

module

1746-IV8

DeviceNet network

1 3

to pin 5 DeviceNet connector

to pin 1 DeviceNet connector

DIP790 Device Net Dist. Board

Slot 3Power Su

8 pt.Output

module

1746-OB8

PS to DeviceNet Dist. Color Descri black clear

red BUS+

tion

BUS- (0vdc

Shield (Drain)

24vdc

in DIN RS232 Serial

Interface to Barcode

Scanner

Reader

h Scale or etc .

Wei

RS232 Pin Layout

Pin Pin Pin

Func. Func.

RXD

TXD

GND

Pin 1,4,6,9 are unused

Figure 1. DN120 Integrated with Allen Bradley SLC500

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RTS CTS

DeviceNet

Module

Gatewa

DN120

RS232-DeviceNet

DeviceNet

Male Connector

Terminal Connector

Color

black

2 3 4 5

blue

clear

white

red

data low (CAN L

data high (CAN H)

DeviceNet Connector

Color Description

clear

red

black

4 5

data hi

white

blue data low

Description

BUS-

V-

shield (Drain

V+ (BUS+)

shield (Drain)

V+ (BUS+)

V- (BUS-)

CAN H CAN L

DN120 DeviceNet Gateway User’s Manual

Configure DeviceNet Interface

Follow instructions in Chapter 4 to set the gateway’s rotary switches to 125Kbps baud rate and MAC ID to 03. Set the RS232 Baud Rate switch to PRG mode. Connect the gateway to the

DeviceNet network to power it up. During power-up, the NET and MOD LEDs cycle through a sequence of alternating red and green. After power-up, the NET LED should be flashing green and the MOD LED should be solid green.

Connect & Register EDS File

1) Start up the RSNetworx program. Select the Online operation from the Network menu.

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2) The following text box should pop up, showing the networks connected to your computer.

3) Click on the 1770-KFD-1 + to show all connected DeviceNet devices. The gateway is at

MAC ID 03, verifying its DeviceNet connection. It is an Unrecognized Device until the

gateway’s EDS file is registered with RSNetworx.

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4) Click Cancel to close Browse for network window. Select the EDS Wizard… operation from

the Tools menu. Click Next> to continue.

5) Select the Register an EDS file(s) option and click Next>.

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6) Select Register a single file option. Browse for your gateway’s EDS file. You can download

the latest EDS and ICON files from the www.microscan.com website. Click Next> when you have the correct path and EDS file name in the Named: box.

7) The next screen shows the RSNetworx installation test results. Click View file… to view the

actual EDS file text. Click Next> to continue.

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8) The next screen allows you to customize the gateway’s icon for RSNetworx. Click on

Change icon…

9) The Change Icon screen pops up. Click Browse to enter path for DN120 icon file. You can

download the icon file from www.microscan.com.

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10) Enter the path to DN120 icon file in the File name: box. Click Open to continue.

11) The DN120 icon should have changed to the proper icon. Click Next to continue.

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12) The final step is to finish EDS file registration. Click Next> to complete the registration

process. Click Finish to close the EDS Wizard window.

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13) Repeat steps 1, 2, and 3 to browse the DeviceNet network. RSNetworx should now

recognize the device at MAC ID 03 as a DN120 gateway, and display the DN120 icon. Click

Cancel when finished.

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Configure Serial Channel

Once the gateway is connected to DeviceNet and communicating with RSNetworx, you can configure its serial channel. Make sure the gateway is not in the DeviceNet master scanlist before changing any attribute values.

The Serial Stream Object attributes control the gateway’s serial channel transmit and receive operations. The following steps show how to configure the Serial Stream Object attributes using the RSNetworx program.

1) Select the Online operation from the Network menu. Select the DeviceNet adapter (1770-

KFD-1 in this example) and click OK.

2) RSNetworx prompts you to upload the network configuration. Click OK to continue.

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3) RSNetworx displays the following text box while it uploads the network configuration.

4) The following screen displays the online nodes.

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5) Left-click on the DN120 icon to select it. Right-click and select Properties from the pop-up

menu. You can also double-click on the DN120 icon to open its properties box.

6) RSNetworx displaces the following text box while is reads DN120 EDS file.

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7) The DN120 Properties Box is displayed.

8) Select the Parameters tab. You will be prompted for the parameters source. Select the

Upload button to upload DN120 parameters from the actual device. All the DN120 parameters are now shown in the Properties window.

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9) You may now edit the Serial Stream Object attributes in this window

Note that the Idle String and Fault String attributes are not listed. These attributes use

Short_String data type, which is not supported by RSNetworx EDS File interface.

10) Use the Class Instance Editor to configure Short_String attributes.

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11) Select the Set_Attribute_Single service code to write an attribute value, and the

Get_Attribute_Single service code to read an attribute value. Check Values in decimal box to enter class, instance, attribute, and data values in decimal.

The Idle String address is Class 64, Instance 1, Attribute Number 19. The Fault String address is Class 64, Instance 1, Attribute Number 20. Enter the Short_String data as length byte, then data bytes. Example is [0x01 0x02] for a single byte string 0x02 (ASCII STX).

12) Enter the remaining Serial Stream Object attributes in the Parameters Box window.

Status – Click on … to open selection box. Shows current status and error information. Click

on any errors to clear check. Press OK to continue.

Baud Rate – Click on arrow to the right of the current value to select from pull-down menu.

Parity – Click on arrow to the right of the current value to select from pull-down menu.

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Data Size – Read-only value, set to 8 if no parity selected and 7 if party selected. Stop Bit – Read-only value, always set to 1. Flow Control – Click on arrow to the right of the current value to select from pull-down menu. Receive Count – Read-only value. Transmit Count – Read-only value. Maximum Receive Size – Click on current value and enter desired number in decimal. Maximum Transmit – Click on current value and enter desired number in decimal. Data Format – Click on …

to open selection box. Click on check box to select the desired

option. The Delimiter Mode uses bits 0, 1, 2, 3 of the byte. Ignore bits 4 through 7.

Block Mode – Click on … to open up selection box. Click on check box to set or clear the

desired bit. The Serial Status byte uses bits 0 through 6. Ignore bit 7.

Receive Delimiter – Click on current value and enter number in decimal. Pad Char – Click on current value and enter number in decimal.

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Configure DeviceNet Master Scan list

After all the object instances have been configured, the DeviceNet master can be configured to poll the gateway.

1) Before using the RSNetworx to map the gateway’s Polled I/O connection to 1747-SDN

DeviceNet master scanner, you must calculate the Poll Produce Size & Poll Consume Size.

Chapter 4 describes how to calculate these values.

2) Double click on the 1747-SDN icon to open its Properties box. You can also left click on

the icon to select it, right click for the pop-up menu, and select Properties.

3) Select the Scan list tab. RSNetworx prompts you for the Scanner Configuration. Click

Upload to upload current 1747-SDN configuration from the node. RSNetworx displays the upload progress.

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4) The next window shows the Available Devices: that can be added to the 1747-SDN Scanlist.

5) Select the Automap on Add checkbox if you want RSNetworx to automatically map the

DN120 input and output bytes into the 1747-SDN memory.

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6) Select the DN120 under Available Devices: and click the > button to transfer to Scanlist.

7) RSNetworx warns that the DN120 does not contain any I/O data. Click OK to continue.

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8) Click on the Edit I/O Parameters button. Use the ∧ and ∨ buttons to set Rx Size: to the

calculated Poll Consume Size value and the Tx Size: to the calculated Poll Produce Size value. Click Apply to update I/O parameters.

9) RSNetworx prompts to Automap the new input and output data bytes. Select Yes to

automap. If you select No, then you must manually map the I/O bytes in the memory tables.

10) RSNetworx prompts if you want to download the changes to the 1747-SDN. Click Yes.

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11) Select the Input tab to view the automapped DN120 input bytes.

12) Click the Advanced… button to view current input mapping detail. Change the mapping to

suit your application. Click Apply Mapping button after you make changes. Click Yes at the RSNetworx prompt to download any changes to the 1747-SDN. Click Close to continue.

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13) Select the Output tab to view the automapped DN120 output bytes.

14) Click the Advanced… button to view current input mapping detail. Change the mapping to

suit your application. Click Apply Mapping button after you make changes. Click Yes at the RSNetworx prompt to download any changes to the 1747-SDN. Click Close to continue.

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DN120 DeviceNet Gateway User’s Manual

Chapter 7 – Configuration Examples

This chapter contains four example gateway configurations.

Example 1 – Receiving Fixed-Length Data

Read UPC labels into a PLC using a serial barcode scanner, a DN120 gateway, and a DeviceNet scanner (master). The barcode scanner RS232 channel is connected to a DN120 serial channel. The DN120 DeviceNet channel is connected to the PLC DeviceNet scanner. The DeviceNet network is powered by an external 24VDC power supply.

PLC & DeviceNet Scanner

CDN066 Gateway

DeviceNet network

Barcode Scanner The barcode scanner’s RS232 channel is set for 9600 bps, 8 data bits, no parity, and 1 stop bit. When it reads a UPC label, it transmits a 5-byte serial message, which consists of the 5 ASCII characters printed on the UPC label.

Power

Supply

DN120 Gateway

The receive mode will be Stream Mode, since there is no defined Delimiter for the start of a

message or the end of a message. All received data bytes will be returned as DeviceNet input

bytes. The Maximum Receive Size is 5, because the Barcode Scanner messages have a fixed

length of 5 bytes. The data bytes will be returned as a Short_String. The gateway will only return the data bytes once in a Poll Response Message.

The Serial Stream Object can now be configured. The following shows the Serial Stream Object

attribute settings for this application. The 3rd column lists the address string if using Set_Attribute_Single commands to write the attribute values.

Serial Stream Object Configuration (Class Code 64 or 0x40)

Attribute Data Class / Instance / Attribute / Data Description

6. Baud Rate 0 0x40 0x01 0x06 0x00 0 = 9600 bps

7. Parity 0 0x40 0x01 0x07 0x00 0 = no parity

10. Flow Control 2 0x40 0x01 0x0A 0x02 2 = CTS / RTS

13. Max Receive Size 5 0x40 0x01 0x0D 0x05 Fixed message size of 5 bytes

14. Data Format 00000001 0x40 0x01 0x0E 0x01 String Format = Short_String

15. Block Mode 00000000 0x40 0x01 0x0F 0x00

The gateway will return 6 bytes of Receive Data, because the Maximum Receive Size is set to 5 and the data format is Short String (add 1 for length byte). The Status and Receive Sequence Number bytes are not enabled. The Poll Produce Size can now be calculated for this DN120 configuration.

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Status byte 0 Receive Sequence Number byte 0 Short_String length byte 1

+ Maximum Receive Size 5

Poll Produce Size 6

The format of the Poll Response Message input bytes is as follows:

[ Short_String length ] [ Short_String data ]

1 byte 5 bytes

The gateway always returns 6 input bytes in the Poll Response Message, even if a new barcode message has not been received. The gateway will return new message data only once, and return a null data string if there is no new message data. The application should check the Short_String length byte to determine if a new message is being returned. A length of 5 indicates valid data bytes (new message data). A length of 0 indicates no valid data bytes (no new message).

The Barcode Scanner sends the following 5-byte serial message when it reads a UPC label printed with ‘12345’ (ASCII numbers).

0x31 0x32 0x33 0x34 0x35

The gateway generates the following Poll Response Message in response to the first Poll Command Message after its receives the Barcode message. The Short_String length is 5, since 5 bytes were received.

0x31 0x32 0x33 0x34 0x350x05

The gateway generates the following Poll Response Message in response to subsequent Poll Command Messages, until it receives another Barcode message. The Short_String length is 0, indicating a null data string. The 5 data bytes are undefined.

XX XX XX XX XX0x00

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Example 2 – Receiving Pre-Delimited Data

Same configuration as Example 1.

Barcode Scanner The barcode scanner’s RS232 channel is set for 9600 bps, 8 data bits, no parity, and 1 stop bit. When it reads a UPC label, it transmits following ASCII message format. The message always begins with the ASCII STX start-of-text (0x02) character. The barcode data will consist of a variable number of 1 to 14 ASCII characters, depending upon the UPC label being scanned. It will not transmit a 0x02 in the barcode data field.

[ STX ] [ ASCII barcode data ]

DN120 Gateway

The receive mode will be Pre-Delimiter Mode, because the barcode messages always begin with the same character. The Delimiter is 0x02 (STX). The Maximum Receive Size is 15, because the

largest message contains 1 STX byte and 14 ASCII bytes. The received bytes will be returned as a Short_String. An ASCII NUL Pad character (0x00) will be added at the end of the message if needed. The gateway will always return the data bytes in the Poll Response Message. The

Receive Sequence Number will be used to indicate when a new message is returned.

The Serial Stream Object can now be configured. The following shows the Serial Stream Object

attribute settings for this application. The 3rd column lists the address string if using Set_Attribute_Single commands to write the attribute values.

Serial Stream Object Configuration (Class Code 64 or 0x40)

Attribute Data Class / Instance / Attribute / Data Description

6. Baud Rate 0 0x40 0x01 0x06 0x00 0 = 9600 bps

7. Parity 0 0x40 0x01 0x07 0x00 0 = no parity

10. Flow Control 2 0x40 0x01 0x0A 0x02 2 = CTS / RTS

13. Max Receive Size 15 0x40 0x01 0x0D 0x0F Receive messages up to 15 bytes

14. Data Format 00001101 0x40 0x01 0x0E 0x0D Pad receive message

15. Block Mode 00101101 0x40 0x01 0x0F 0x2D Re-send = enabled

16. Delimiter STX 0x40 0x01 0x10 0x02 0x02 = ASCII STX character

17. Pad Character NUL 0x40 0x01 0x11 0x00 0x00 = ASCII NUL character

Pad justification = right (end of msg) String Format = Short_String

Receive Sequence Number = enabled Delimiter = enabled Pre-Delimiter

The gateway will return up to 16 bytes of Receive Data, because the Maximum Receive Size is set to 15 and the data format is Short String (add 1 for length byte). The Status byte is not enabled. The Receive Sequence Number byte is enabled. The Poll Produce Size can now be calculated for this DN120 configuration.

Status byte 0 Receive Sequence Number byte 1 Short_String length byte 1

+ Maximum Receive Size 15

Poll Produce Size 17

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The format of the Poll Response Message input bytes is as follows:

[ Receive Sequence Number ] [ Short_String length ] [ Short_String data ] [ Pad bytes ]

1 byte 1 byte 0-15 bytes

The gateway always returns 17 input bytes in the Poll Response Message, even if the scanned barcode data contains fewer bytes. The application should check the Short_String length byte to determine the number of valid data bytes being returned in a particular Poll Response Message. The remaining input bytes have undefined values.

The gateway will always return the last received Short_String data in its Poll Response Message. The gateway increments the Receive Sequence Number when new Short_String data is returned. The application can use the Receive Sequence Number to determine if the Short_String data is new or old information.

The Barcode Scanner sends the following 8-byte serial message when it reads a UPC label printed with ‘1234567’ (ASCII numbers).

0x02 0x31 0x32 0x33 0x34 0x35 0x36 0x37

The gateway generates the following Poll Response Message. The Receive Sequence Number is 1, since this is the first message received from the Barcode Scanner. The Short_String length is 8, since 8 bytes were received. 7 Pad characters are added at the end of the message.

0x02 0x31 0x32 0x33 0x34 0x35 0x36 0x370x01 0x08 0x00 0x00 0x00 0x00 0x00 0x00 0x00

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Example 3 – Receiving Post-Delimited Data

Same configuration as Example 1.

Barcode Scanner The barcode scanner’s RS232 channel is set for 9600 bps, 8 data bits, no parity, and 1 stop bit. When it reads a UPC label, it transmits following ASCII message format. The message always begins ends with the ASCII ETX end-of-text (0x03) character. The barcode data will consist of a variable number of 1 to 14 ASCII characters, depending upon the UPC label being scanned. It will not transmit a 0x03 in the barcode data field.

[ ASCII barcode data ] [ ETX ]

DN120 Gateway

The receive mode will be Post-Delimiter Mode, because the barcode messages always end with the same character. The Delimiter is 0x03 (ETX), and will not be included in the receive data. The Maximum Receive Size is 15, because the largest message contains 14 ASCII bytes and 1

ETX byte. The received bytes will be returned a Short String. The gateway will only return new

data bytes once in the Poll Response Message. The Status byte will be enabled.

The Serial Stream Object can now be configured. The following shows the Serial Stream Object

attribute settings for this application. The 3rd column lists the address string if using Set_Attribute_Single commands to write the attribute values.

Serial Stream Object Configuration (Class Code 64 or 0x40)

Attribute Data Class / Instance / Attribute / Data Description

6. Baud Rate 0 0x40 0x01 0x06 0x00 0 = 9600 bps

7. Parity 0 0x40 0x01 0x07 0x00 0 = no parity

10. Flow Control 2 0x40 0x01 0x0A 0x02 2 = CTS / RTS

13. Max Receive Size 15 0x40 0x01 0x0D 0x0F Receive messages up to 15 bytes

14. Data Format 00000001 0x40 0x01 0x0E 0x01 String Format = Byte Array

15. Block Mode 00000110 0x40 0x01 0x0F 0x06 Delimiter = enabled

16. Delimiter ETX 0x40 0x01 0x10 0x03 0x03 = ASCII ETX character

Strip Delimiter enabled Post-Delimiter

The gateway will return up to 16 bytes of Receive Data, because the Maximum Receive Size is set to 15 and the data format is Short String (add 1 for length byte). The Status byte is enabled. The Receive Sequence Number byte is not enabled. The Poll Produce Size can now be calculated for this DN120 configuration.

Status byte 1 Receive Sequence Number byte 0 Short_String length byte 1

+ Maximum Receive Size 15

Poll Produce Size 17

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The format of the Poll Response Message input bytes is as follows:

[ Status ] [ Short_String length ] [ Short_String data ] [ undefined bytes ] 1 byte 1 byte 0-15 bytes

The gateway always returns 16 input bytes in the Poll Response Message, even if the scanned barcode data contains fewer bytes, or if a new barcode message has not been received. The gateway returns new message data only once, and returns a null data string if there is no new message data. The application should use the Short_String length byte to determine if a new message is being returned. A length greater than zero indicates the number of valid data bytes (new message data). A length of 0 indicates no valid data bytes (no new message).

The Barcode Scanner sends the following 6-byte serial message when it reads a UPC label printed with ‘12345’ (ASCII numbers).

0x31 0x32 0x33 0x34 0x35 0x03

The gateway generates the following Poll Response Message in response to the first Poll Command Message after its receives the Barcode message. The Status Byte is 0x0A, indicating no transmit or receive errors, an empty Transmit Buffer, and an empty Receive Buffer. The Delimiter is stripped, so the Short_String length is 5. There are 5 valid data bytes, and the remaining 10 input bytes are undefined.

0x31 0x32 0x33 0x34 0x350x0A 0x05 XX XX XX XX XX XX XX XX XX XX

0x0A 0x00 XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX

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Example 4 – Transmitting Fixed-Length Data

Print an ASCII string from a PLC to a bar code scanner, using a DN120 gateway and a DeviceNet scanner (master). The text message string is always 25 characters long, including any ASCII control characters. The bar code scanner RS232 channel is connected to a DN120 serial channel. The DN120 DeviceNet channel is connected to the PLC DeviceNet scanner. The DeviceNet network is powered by an external 24VDC power supply.

PLC & DeviceNet Scanner

DN120 Gateway

DeviceNet network

Power

Supply

Bar Code Scanner The bar code scanner’s RS232 channel is set for 9600 bps, 7 data bits, even parity, and 1 stop bit.

DN120 Gateway The DN120 serial channel is configured to transmit this RS232 message format. A string format will be Byte Array, since the message size is fixed. Transmit Sequence Numbers will be used to signal a new message to transmit. The Maximum Transmit Size is 25, which is the number of

message bytes. The Serial Stream Object attributes are shown below for this application. The

3rd column lists the address string if using Set_Attribute_Single commands to write the attribute values.

Serial Stream Object Configuration (Class Code 64 or 0x40)

Attribute Data Class / Instance / Attribute / Data Description

6. Baud Rate 5 0x40 0x01 0x06 0x05 5 = 300 bps

7. Parity 1 0x40 0x01 0x07 0x01 1 = Even parity

10. Flow Control 1 0x40 0x01 0x0A 0x01 1 = XON / XOFF

14. Data Format 00000000 0x40 0x01 0x0E 0x00 String Format = Byte Array

15. Block Mode 00010000 0x40 0x01 0x0F 0x10 Transmit Sequence Number enabled

18. Max Transmit Size 25 0x40 0x01 0x12 0x19 Fixed message size of 25 bytes

The gateway will transmit 25 output bytes received in a Poll Command Message. The Status Clear byte is not enabled. The Transmit Sequence Number is enabled. The Length Byte is not enabled (Byte Array format). The Poll Consume Size can now be calculated for this DN120 configuration.

Status Clear byte 0 Transmit Sequence Number byte 1 Short_String length byte 0

+ Maximum Receive Size 25

Poll Produce Size 26

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The format of the Poll Command Message output bytes is as follows:

[ Transmit Sequence Number ] [ message data ]

1 byte 25 bytes

The gateway always receives 26 output bytes in the Poll Command Message. It will not transmit a new serial message until the Transmit Sequence Number received in the Poll Command is different than the number received in a previous Poll Command. The application should increment the Transmit Sequence Number when it sends new output byte values in the Poll Command Message, to enable the transmission of the new message.

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Example 5 – Transmitting Variable-Length Data

Same configuration as Example 4, except the text message string can be from 1 to 25 characters long, including ASCII control characters.

Bar Code Scanner The bar code scanner’s RS232 channel is set for 9600 bps, 7 data bits, even parity, and 1 stop bit.

DN120 Gateway The DN120 serial channel is configured to transmit this RS232 message format. A string format will be Short_String, since the message size is variable. The Maximum Transmit Size is 25,

since the largest text message contains 25 characters. The Serial Stream Object attributes are

shown below for this application. The 3rd column lists the address string if using Set_Attribute_Single commands to write the attribute values.

Serial Stream Object Configuration (Class Code 64 or 0x40)

Attribute Data Class / Instance / Attribute / Data Description

6. Baud Rate 5 0x40 0x01 0x06 0x05 5 = 300 bps

7. Parity 1 0x40 0x01 0x07 0x01 1 = Even parity

10. Flow Control 1 0x40 0x01 0x0A 0x01 1 = XON / XOFF

14. Data Format 00000001 0x40 0x01 0x0E 0x01 String Format = Short_String

15. Block Mode 00000000 0x40 0x01 0x0F 0x00 Transmit Sequence Number disabled

18. Max Transmit Size 25 0x40 0x01 0x12 0x19 Fixed message size of 25 bytes

The gateway will transmit the output bytes received in a Poll Command Message. The Status Clear byte is not enabled. The Transmit Sequence Number is not enabled. The Length Byte is enabled (Short_String format). The Poll Consume Size can now be calculated for this DN120 configuration.

Status Clear byte 0 Transmit Sequence Number byte 0 Short_String length byte 1

+ Maximum Receive Size 25

Poll Produce Size 26

The format of the Poll Command Message output bytes is as follows:

[ Short_String length ] [ message data ]

1 byte 25 bytes

The gateway always receives 26 output bytes in the Poll Command Message, regardless of the variable length messages. The gateway uses the Short_String length byte to determine the valid number of message bytes in the Poll Command Message. It will only transmit the valid message bytes. All remaining output bytes are ignored. If the gateway receives a Poll Command Message with Short_String length = 0, no output bytes are transmitted. The application can send variable-length Short_Strings to be transmitted, and send Null Data (length = 0) when there is no message to transmit.

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Chapter 8 – Troubleshooting

Problem Possible Cause

DeviceNet Configuration Program does not recognize Gateway.

DeviceNet Configuration Program does not recognize Gateway after loading EDS file.

• Register Gateway EDS file with Configuration Program.

• Check Major and Minor Revisions for Gateway and EDS file, to see if you have

correct EDS file for your Gateway's firmware version.

Gateway does not appear on DeviceNet network.

After setting Gateway MAC ID, DeviceNet Master does not recognize Gateway.

NET LED is flashing red.

NET LED is solid red.

NET LED is off.

MOD LED is flashing or solid red. RX LED does not flash green when

data is sent to the Gateway.

• Check wiring and cable connections.

• Check DeviceNet power supply voltage.

• Make sure Gateway baud rate matches network baud rate.

• Verify Gateway baud rate is set from rotary switches or retentive memory value.

• Make sure Gateway MAC ID is not used by another device.

• Disconnect Gateway from network before changing MAC ID.

• Make sure Gateway MAC ID is not used by another device.

• Verify Gateway MAC ID is set from rotary switches or retentive memory value.

• Verify DeviceNet baud rate.

• Gateway is removed from DeviceNet Master scanlist or network. Power cycle

Gateway to reset.

• Make sure Gateway MAC ID is not used by another device. Possible DeviceNet

network failure.

• Check wiring and cable connections.

• Check DeviceNet power supply voltage.

• Make sure Gateway baud rate matches network baud rate.

• Verify Gateway baud rate is set from rotary switches or retentive memory value.

• Gateway has failed. Cycle power to reset. Replace Gateway if necessary.

• If Sync enabled, make sure Receive Request Number and Receive Acknowledge

Number are equal. Application must acknowledge last received message before gateway will receive the next message.

• Verify data is being received in Receive Data.

• Verify source device is transmitting data to Gateway.

• Make sure hardware flow control signals are properly connected.

RX LED is solid red after Gateway

receives data.

TX LED is solid red after receiving

data from DeviceNet Master.

TX LED does not flash green when

Gateway should be transmitting data.

1747-SDN Scanner displays error code 77.

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• Check Status byte for any Receiver errors. Reset Gateway or clear Status error

bits if necessary.

• Make sure parity is set to match transmitting device settings.

• Check Status byte for Transmitter errors. Reset Gateway or clear Status error

bits if necessary.

• Make sure parity is set to match receiving device settings.

• If Transmit Sequence Number enabled, make sure number is being incremented

by the application. Gateway will not transmit new data unless the Transmit Sequence Number is changed.

• Verify data is being saved in Transmit Data.

• Gateway Poll Produce Size and/or Poll Consume Size value do not 1747-SDN

Poll Rx/Tx settings.

DN120 DeviceNet Gateway User’s Manual

Appendix A – Product Specifications

DeviceNet Interface

Power Requirements: 11 - 28 Vdc @ 50 mA Loss of Ground: Yes Reverse Polarity: -30 Vdc Signal Levels: ISO11898

Serial Channel

Isolation: 500 Volts ESD Protection: +/- 10 kV Overload Protection: +/- 30 Volts Short Circuit: Indefinite RS232 Output Levels: +/- 7.9 Volts (unloaded, typical)

Environmental

Operating Temperature: 0o C to 70o C Storage Temperature: -25o C to 85o C Size (inches): 3.25 x 2.37 x 1.08 Mounting (inches) 0.5 tabs, 3/16 diameter mounting holes PCB Encapsulation: RTV Silicon Compound

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Appendix B – DeviceNet Template

Class InstanceAttribute Default Setting Unit Comments

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Appendix C – ASCII Character Codes

Non-Printable Characters Printable Characters

Hex Dec Char Name Kybd Hex Dec Char Hex Dec Char Hex Dec Char

0x00 0 NUL Null Ctrl @ 0x20 32 Space 0x40 64 @ 0x60 96 ` 0x01 1 SOH Start of heading Ctrl A 0x21 33 ! 0x41 65 A 0x61 97 a 0x02 2 STX Start of text Ctrl B 0x22 34 " 0x42 66 B 0x62 98 b 0x03 3 ETX End of text Ctrl C 0x23 35 # 0x43 67 C 0x63 99 c 0x04 4 EOT End of transmit Ctrl D 0x24 36 $ 0x44 68 D 0x64 100 d 0x05 5 ENQ Enquiry Ctrl E 0x25 37 % 0x45 69 E 0x65 101 e 0x06 6 ACK Acknowledge Ctrl F 0x26 38 & 0x46 70 F 0x66 102 f 0x07 7 BEL Bell Ctrl G 0x27 39 ' 0x47 71 G 0x67 103 g 0x08 8 BS Backspace Ctrl H 0x28 40 ( 0x48 72 H 0x68 104 h 0x09 9 HT Horizontal tab Ctrl I 0x29 41 ) 0x49 73 I 0x69 105 i 0x0A 10 LF Line feed Ctrl J 0x2A 42 * 0x4A 74 J 0x6A 106 j 0x0B 11 VT Vertical tab Ctrl K 0x2B 43 + 0x4B 75 K 0x6B 107 k 0x0C 12 FF Form feed Ctrl L 0x2C 44 , 0x4C 76 L 0x6C 108 l 0x0D 13 CR Carriage return Ctrl M 0x2D 45 - 0x4D 77 M 0x6D 109 m 0x0E 14 SO Shift out Ctrl N 0x2E 46 . 0x4E 78 N 0x6E 110 n 0x0F 15 SI Shift in Ctrl O 0x2F 47 / 0x4F 79 O 0x6F 111 o 0x10 16 DLE Data line escape Ctrl P 0x30 48 0 0x50 80 P 0x70 112 p 0x11 17 DC1 Device control 1 Ctrl Q 0x31 49 1 0x51 81 Q 0x71 113 q 0x12 18 DC2 Device control 2 Ctrl R 0x32 50 2 0x52 82 R 0x72 114 r 0x13 19 DC3 Device control 3 Ctrl S 0x33 51 3 0x53 83 S 0x73 115 s 0x14 20 DC4 Device control 4 Ctrl T 0x34 52 4 0x54 84 T 0x74 116 t 0x15 21 NAK Negative acknowledge Ctrl U 0x35 53 5 0x55 85 U 0x75 117 u 0x16 22 SYN Synchronous idle Ctrl V 0x36 53 6 0x56 86 V 0x76 118 v 0x17 23 ETB End of transmit block Ctrl W 0x37 55 7 0x57 87 W 0x77 119 w 0x18 24 CAN Cancel Ctrl X 0x38 56 8 0x58 88 X 0x78 120 x 0x19 25 EM End of medium Ctrl Y 0x39 57 9 0x59 89 Y 0x79 121 y 0x1A 26 SUB Substitute Ctrl Z 0x3A 58 : 0x5A 90 Z 0x7A 122 z 0x1B 27 ESC Escape Ctrl [ 0x3B 59 ; 0x5B 91 [ 0x7B 123 { 0x1C 28 FS File separator Ctrl \ 0x3C 60 < 0x5C 92 \ 0x7C 124 | 0x1D 29 GS Group separator Ctrl ] 0x3D 61 = 0x5D 93 ] 0x7D 125 } 0x1E 30 RS Record separator Ctrl ^ 0x3E 62 > 0x5E 94 ^ 0x7E 126 ~ 0x1F 31 US Unit separator Ctrl _ 0x3F 63 ? 0x5F 95 _ 0x7F 127 DEL

Microscan Systems, Inc.

Microscan DN120 DeviceNet User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual