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 $5.00 Made in the U.S.A.
Contents Pg. Item 23 Index Pg. Fig.
Data Comm How to Use Data Communications with the Watlow 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 ˜ NOTE: This is expert userlevel material, and requires previous experience with data comunications.
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.
RS-423 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.
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.
Configuration Figure 4 Internal EIA/TIA-422 & EIA/TIA-423 Switch Location and Selection. Series 733/734 (rear view) ˜ EIA/TIA-422 (C2) ← → EIA/TIA-423 (C1) NOTE: The Series 733/734 leaves the factory configured for EIA/TIA-423 operation, unless otherwise requested. 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.
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] Press to change value: or Press for next prompt: Press to exit: Document any changes. Enter data on a photocopy of this page. Table 1 Program Mode prompts and Descriptions.
Read ASCII ASCII Character Set Dec 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 Hex 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F Char NUL SOH STX ETX EOT ENQ ACK BEL BS HT LF VT FF CR SO SI Dec 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Hex 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F Char DLE DC1 DC2 DC3 DC4 NAK SYN ETB CAN EM SUB ESC FS GS RS US Dec 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 Hex 20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F Char SP ! " # $ % & ' ( ) * + , .
Learn Syntax Series 733/734 General Message Syntax As soon as you link the devices, you'll be able to talk to the Series 733/734 using ASCII characters. The Series 733/734 will respond to any Operation or Program prompt, plus some others. The control will respond to either upper or lower case ASCII characters from your computer. Both protocol/interface combinations will respond to the general syntax, providing the commands or queries are correctly transmitted. However, the ANSI X3.
See Syntax Example Format For your benefit, we're presenting message/response examples with syntax required for Series 733/734 communication. Information bracketed by < > indicates a description, rather than literal characters. We show each ASCII character that you must transmit to the Series 733/734, including space between the characters. (A "space" is itself an ASCII character, hex 20). For clarity, we also represent each ASCII character as a hexadecimal pair.
XON/XOFF "=" How To Start and Stop Communicating with the Series 733/734 and XON/XOFF Starting communications with XON/XOFF Protocol is simple. You just configure your computer to agree with the Series 733/734 communication prompts and open its serial communication port in software. Then begin to "talk" by transmitting a message to the Series 733/734. You stop communicating with XON/XOFF Protocol simply by ceasing to send messages.
XON/XOFF "?" XON/XOFF "?" Command Example You want to know the Alarm 1 Low (A1LO) value. The "?" uses a variation of the message syntax shown just below. This protocol requires an ending carriage return character. "?" Command syntax with XON/XOFF Protocol: ? data.1 Enter in ASCII: ? A1LO The hex string will be: 3F2041314C4F0D ? Space A 1 ASCII Characters HEX Value L Figure 7 XON/XOFF "?" Command Example.
ANSI X3.28 ANSI X3.28 Protocol for EIA/TIA-422 and EIA/TIA-485 The ANSI X3.28 Protocol provides high quality communications by requiring a response to every message. With a multiple device or "multidrop" network, this protocol prevents confusion among the separate devices. Furthermore, if noise occurs somewhere in the system, no prompt will change because noise can't comply with the protocol. By placing messages inside a protocol envelope, the messages are protected.
ANSI X3.28 "=" Stopping Communications in ANSI X3.28 Protocol The master device, your computer, must end communications with Device #4 by using Data Link Escape (DLE) and End of Transmission (EOT) characters. Enter in ASCII: ASCII Characters HEX Value 10 04 Response from the 733/734: None ANSI X3.28 "=" Command Example The "=" Command sets a specific 733/734 prompt to a specific value. The general command syntax applies to all commands.
ANSI X3.28 "?" Response from the Series 733/734: The hex response string is: 06 • You'll find the the complete list of "=" command arguments (prompts and value limits) in Table 5, Pages 17-19. ANSI X3.28 "?" Command Example You need to know the Alarm 1 Low value (A1LO). The "?" uses a variation of the message syntax shown just below. This syntax requires the protocol start of text and end of text characters. "?" command syntax with ANSI X3.28 Protocol: ?
Commands Command Summary Series 733/734 Data Communications Name Description Read (?) and/or Write (=) Syntax Range (data.1) Add ETX & STX with ANSI X3.28 Protocol (data.2) ? A1HI = A1HI data.2 Process Alarm: A1LO to R1H Deviation Alarm: 0 to 555°C/0 to 999°F A1LO Zone 1 Alarm Low ? A1LO = A1LO data.2 Process Alarm: R1L to A1HI Deviation Alarm: 0 to -555°C/0 to -999°F A2HI ? A2HI = A2HI data.
Commands Name Description Read (?) and/or Write (=) Syntax Range (data.1) Add ETX & STX with ANSI X3.28 Protocol (data.2) ER1 Error 1 Code (Multiple errors possible.
Name Description Read (?) and/or Write (=) Syntax Range (data.1) Add ETX & STX with ANSI X3.28 Protocol (data.2) MDKY Mode Key Action = MDKY 1 1 = One MODE Key press MDL ? MDL x1 = 3 or 4; horiz. or vert. unit x2 & x3 = Last two characters of model #, AA-XX x4 = Software rev; 0-9 or A-X Model Number Responds 73x-xx-x (See Model # , p.
Errors NAKs and Error Codes When your message is "not acknowledged" (NAK) in EIA/TIA-422 or EIA/TIA-485 with ANSI X3.28 Protocol, you may clear ER2 codes by reading it. That is, use "?" Then try the message again; you may have made a syntax error. See the error code listing in Table 5, page 17. With XON/XOFF protocol and the EIA/TIA-423 interface, the 733/734 sends no feedback on commands. Therefore, you may want to query the status of ER2 after each command you send.
Model Number 7 3 _A-____-__AA 733/734 = One or two channel microprocessor-based, time and temperature control; 24VÅ (VAC) power input. *Order power supply and connector kit(s) separately below.
WATLOW Series 733/734 How to Use Data Communications
A Addr, 8 Address, 14 ALM, 17 ANSI X3.28 "=" Command, Fig. 8, 15 ANSI X3.28 "?" Command, Fig. 9, 16 ANSI X3.28 Protocol for EIA/TIA-422 & EIA/TIA485, 14 ASCII Character Set, Table 2, 9 ASCII Control Characters (Partial Set), Table 3, 9 A1HI, A2HI, 17 A1LO, A2LO, 17 AL1, AL2, 17 AUT1, AUT2, 17 B bAUd, 8 Baud Rate, 8 C C1, C2, 17 CAL1, CAL2, 17 Carriage Return, 11 CF, 8, 17 Command, "?" Example ANSI X3.28, 16 XON/XOFF, 13 Command, "=" Example ANSI X3.
Series 733/734 Data Communications User's Manual Watlow Controls, 1241 Bundy Blvd., P.O.
