Watlow 734 User Manual
How To Use
Data Communications
with the Watlow
Series 733/734
Total
Customer
Satisfaction
3 Year
Warranty
User's Manual
Watlow Controls, 1241 Bundy Blvd., P.O.Box 5580, Winona, MN 55987-5580, Phone: 507/454-5300, Fax: 507/452-4507
W733-XDCN Rev D00
November 1995
Supersedes: W733-SA10-9324
Made in the U.S.A.
$5.00
Printed on Recycled Paper
Contents
Pg. Item
Hardware and Wiring
3 Data Communications and the Series 733/734
3 Hardware Interfaces Protocols
3 Communications Wiring
4 EIA/TIA-422 Interface Pinouts
5 EIA/TIA-423 Interface Pinouts
(EIA/TIA-232 Compatible)
6 EIA/TIA-485 Interface Pinouts
6 Connecting the Control and Computer
7 Setting Hardware Protocol Switches
7 Network Connections
Software Setup
8 Communications Setup Prompts
9 ASCII and Series 733/734 Information
10 Series 733/734 General Message Syntax
10 Message Syntax
10 Data Rules
10 Command List
11 Example Format
11 XON/XOFF Protocol for EIA/TIA-423
12 Start and Stop Communicating with the Series
733/734 and XON/XOFF
12 XON/XOFF "=" Command Example
13 XON/XOFF "?" Command Example
14 ANSI X3.28 Protocol for EIA/TIA-422 & EIA/
TIA-485
14 Device Address
Commands
14 Starting Communications in ANSI X3.28
15 Stopping Communications in ANSI X3.28
15 ANSI X3.28 "=" Command Example
16 ANSI X3.28 "?" Command Example
17 Command Summary and Syntax
20 NAKs and Error Codes
20 User Responsibility
21 Series 733 Model Number Information
22 CE Declaration of Conformity
23 Index
Pg. Fig. Item
Figures
4 1 EIA/TIA-422 Interface Wiring
5 2 EIA/TIA-423 Interface Wiring
6 3 EIA/TIA-485 Interface Wiring
7 4 EIA/TIA-422 & EIA/TIA-423 Switch
Selection
11 5 General Message Syntax Example
12 6 XON/XOFF "=" Command Example
13 7 XON/XOFF "?" Command Example
15 8 ANSI X3.28 "=" Command Example
16 9 ANSI X3.28 "?" Command Example
Pg. Table Item
Tables
8 1 Communications Setup
9 2 ASCII Character Set
9 3 ASCII Control Characters (Partial Set)
14 4 Address to ASCII Conversion
17 5 Command Summary and Syntax
2
WATLOW Series 733/734
How to Use Data Communications
How to Use Data Communications with the W atlow Series 733/734
This manual is a supplement to the Series 733/734 Program and Service Manuals.
It is for controls with the data communications option. Use in conjunction with the
Program and Service manuals.
You Have One of Two Serial Hardware Interfaces
Depending on your unit's model number, you have one of two hardware
interfaces:
1)EIA/TIA-422 for a "multidrop" or (multiple device) network, up to ten devices
total; with 4000 ft. network length limit, or EIA/TIA-423 (EIA/TIA-232 compatible)
for one on one communication with a 50 ft. network length limit with a 733/734
(73xx-xxxx-xBxx) and a host computer. Selecting EIA/TIA-422 or EIA/TIA-423 is
user selectable via internal switches. See Page 7.
2)EIA/TIA-485 (73xx-xxxx-xDxx) also for a multidrop network, up to 32
addresses total, and with a 4000 ft. network length limit.
Data Comm
˜
NOTE:
This is expert userlevel material, and
requires previous
experience with data
comunications.
You Can Use One of Two Software Protocols
There are two protocols available to you. Depending on the type of network you
need, you must use the correct combination of interface and protocol.
We use ANSI X3.28 Protocol, based on ANSI X3.28 - 1976 Subcategories 2.2,
and A3, with the EIA/TIA-422 and EIA/TIA-485 interface to run a multiple device
network. We also use XON/XOFF Protocol, a simpler protocol, to run a two
device network with an EIA/TIA-423 interface. XON/XOFF will also work with the
EIA/TIA-422 and EIA/TIA-485 interface, but the network is limited to two devices
(one computer and a Series 733/734). XON/XOFF Protocol requires no responses
to messages like the ANSI X3.28 Protocol does. Likewise, ANSI X3.28 Protocol,
which provides a response to every message, will work with the EIA/TIA-423
interface. But again you are limited to one Series 733/734 and a host computer.
To select which protocol you are going to use, go into the Program menu and use
the MODE key to advance to the Prot prompt. Select either FULL, for ANSI X3.28
2.2 - A.3, or On for XON - XOFF.
If you are using ANSI X3.28 Protocol, choose an address number for the control
under the Addr prompt following the Prot prompt. This prompt will only appear if
Prot = FULL.
Communications Wiring
To connect your Series 733/734 to a computer, use the next three pages as a
reference. Your computer hardware manual will provide more detailed serial port
pin information. In the often noisy industrial environments, do not take noise
isolation lightly.
How to Use Data Communications
WATLOW Series 733/734
3
RS-422
EIA/TIA-422 Interface Pinouts
73xx-xxxx-xBxx
The EIA/TIA-422 communications uses a four wire (full duplex) system. There are
two separate lines for transmitting, and two lines for receiving data between the
computer and the Series 733/734. With EIA/TIA-422 you can have from one to ten
Series 733/734 controls connected to a single computer.
This diagram is a typical wiring example. The connections on the host computer
may vary depending on models. See page 7 for information about serial interfaces.
Refer to your computer user's manual for more information.
Figure 1 EIA/TIA-422 Interface, Wiring Diagram.
˜
NOTE:
The Electronic
Industry Association (EIA) EIA/TIA422 standard
recommends a
maximum 4000 ft.
total network
distance.
Com
Series
733 / 734
#1
Com
Series
733 / 734
#2
T+
R+
T+
R+
12
11
T-
10
9
R-
8
7
6
5
4
3
2
1
12
T-
11
10
R-
9
8
7
6
5
4
3
2
1
Twisted Pair Wire
Twisted Pair Wire
Common Pin 8
Twisted Pair Wire
Twisted Pair Wire
Common Pin 8
R+
R-
T+
T-
Com
B'
A'
B
A
Gnd.
EIA/TIA-232
to
EIA/TIA-422
Converter
4
WATLOW Series 733/734
How to Use Data Communications
EIA/TIA-423 Interface Pinouts (EIA/TIA-232 Compatible)
73xx-xxxx-xBxx
The EIA/TIA-423 communications uses a three wire (full duplex) system. There is
a separate line for transmitting, a line for receiving data, and a line for signal
common between the computer and the Series 733/734. With EIA/TIA-423 you
can have only one Series 733/734 control connected to a single computer.
This diagram is a typical wiring example. The connections on the host computer
may vary depending on models. Refer to your computer user's manual for more
information.
RS-423
Transmit
Receive
Common
Series 733
(1 unit only)
12
11
10
DB-9 Pinouts
1 DCD
2 receive
3 transmit
9
8
7
6
5
4
3
2
1
1 2 3 4 5
6 7 8 9
4 DTR
5 common
6 DSR
7 RTS
8 CTS
DB-9 female viewed from wire side
(typical connections with jumpers)
Figure 2 EIA/TIA-423 Interface, Pin Designations.
˜
NOTE:
The Electronic
Industry Association (EIA) EIA/TIA423 standard
recommends a
maximum 50 foot
total point-to-point
distance.
How to Use Data Communications
WATLOW Series 733/734
5
EIA-485
EIA/TIA-485 Interface Pinouts
73xx-xxxx-xDxx
The EIA/TIA-485 communications uses a two wire (half duplex) system. There are
only two lines, both lines used for transmitting and receiving. Only one device, the
computer or the control, can be speaking at a time. The Series 733/734 requires a
7 millisecond delay between transmission and receipt of data. With EIA/TIA-485
you can have from one to thirty-two Series 733/734 controls connected to a computer.
This diagram is a typical wiring example. The connections on the host computer
may vary depending on models. See page 7 for information about serial interfaces.
Refer to your computer user's manual for more information.
Figure 3 EIA/TIA-485 Interface, Pin Designations.
˜
NOTE:
The Electronic
Industry Association EIA/TIA-485
standard recommends a maximum
4000 ft. total network distance.
T+ / R+
T- / R-
Com
Series 733
#1
T+ / R+
T- / R-
Com
Series 733
#2
12
11
10
12
11
10
Twisted Pair Wire
9
8
7
6
5
4
3
2
1
9
8
7
6
5
4
3
2
1
Common Pin 8
Twisted Pair Wire
Common Pin 8
T+ / R+
T- / R-
Com
B
A
Gnd.
EIA/TIA-485
Interface
Connecting the Control and the Computer
Remove power from both the Series 733/734 and your computer before connecting
them together. This prevents noise or static interference from entering the data
communication lines. Assemble a cable and the appropriate wiring at your computer. Refer to the wiring on pages 4 through 6. As soon as you connect the data
communications lines, you may apply power to your system.
6
WATLOW Series 733/734
How to Use Data Communications
Series
733/734
(rear view)
Configuration
Figure 4 Internal EIA/TIA-422
& EIA/TIA-423 Switch
Location and Selection.
EIA/TIA-422 (C2) ← → EIA/TIA-423 (C1)
Communications Board
How to Set the EIA/TIA-422 & EIA/TIA-423 Hardware Protocol Switches for 73xx-xxxx-xBxx Units Only
The EIA/TIA-422 or EIA/TIA-423 switches are on the Communication Module Board
(A007-1830) inside the control. Figure 4 shows the approximate location of this
board. Select C1 on both switches for EIA/TIA-423, or C2 on both switches for EIA/
TIA-422 operation. Both switches must be set to the same position.
To change the position of the switches:
Watlow recommends using a properly grounded wrist strap before opening
this control.
1) Remove power from the Series 733/734.
2. Remove the two snap-on connectors from the back of the unit.
2) Remove the two rear cover screws from the back of the unit.
3) Remove the rear cover and locate the switches. See Figure 4.
4) Set both switches to C1 for EIA/TIA-423, or to C2 for EIA/TIA-422
5) Replace the rear cover; secure the two rear cover screws.
6. Re-attach the two snap-on connectors.
7. Apply power to the control.
˜
NOTE:
The Series 733/734
leaves the factory
configured for
EIA/TIA-423 operation, unless otherwise requested.
Your Computer's Serial Interface: The Key To Network Connections
You can connect a data communication-equipped Series 733/734 to any computer
with an EIA/TIA-422 or EIA/TIA-423 (EIA/TIA-232 compatible) or EIA/TIA-485 serial
interface. The IBM™PC® with an EIA/TIA-232 serial output card, for instance, will
talk to a single EIA/TIA-423 equipped Series 733/734. For a multiple 733/734
network with the same PC, you'll need an EIA/TIA-232 to EIA/TIA-422 converter to
act as a "bus," or multiple connection point.
Watlow recommends the Burr-Brown LDM 422 for that purpose. The address is:
Burr-Brown, Inc., 1141 West Grant Rd,. Suite 131, Tucson, AZ 85705,
Phone: (602) 624-2434, Fax: (602) 623-8965.
For EIA/TIA-485, we recommend the Black Box LD485A-MP. The address is:
Black Box Corp., Mayview Road at Park Drive, Box 12800, Pittsburgh, PA 15241,
Phone: (412) 746-5530, Fax: (412) 746-0746.
How to Use Data Communications
WATLOW Series 733/734
7
Comms Setup
Program Mode - Communications Prompts
Enter the Program Mode at the front panel: [0)º0]
Press key sequence:
The display shows: [C_F`]
Continue pressing:
Until: [bAUd]
Current value displays alternately: [1200] or [bAUd]
Table 1 Program Mode
prompts and Descriptions.
Press to change value: or
Press for next prompt:
Press to exit:
Document any changes.
Enter data on a photocopy of this page.
Prompt This Range Factory Appears…
Value Default
[bAUd][bAUd]
[bAUd] (Baud rate)
[bAUd][bAUd]
300, 600, 1200, 2400, 4800, 9600 1200 if comms unit
[dAtA][dAtA]
[dAtA] 7o = 7 data bits and odd parity
[dAtA][dAtA]
7E = 7 data bits and even parity
8n = 8 data bits and no parity 7o if comms unit
(Start bit = 1) (Fixed)
(Stop bit = 1) (Fixed)
[Prot][Prot]
[Prot] FULL = ANSI X3.28 2.2 - A.3 FULL if comms unit
[Prot][Prot]
On = XON - XOFF
[Addr][Addr]
[Addr] 0 to 31 (ASCII) 0 if Prot = FULL
[Addr][Addr]
8
WATLOW Series 733/734
How to Use Data Communications
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