Watlow Electric 945 Series How To Use Manual

How to use data communications

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How To Use

Data Communications

with the Watlow

Series 945

User's Manual

Watlow Controls, 1241 Bundy Blvd., P.O.Box 5580, Winona, MN 55987-5580, Phone: 507/454-5300, Fax: 507/452-4507

$5.00

W945-SA50-9210

March, 1992

Made in the U.S.A.

Supersedes:

Printed on Recycled Paper

W945-SA40-9119

WATLOW Series 945

How to Use Data Communications

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Summary of Contents for Watlow Electric 945 Series

Page 1: Data Communications
Series 945 User's Manual Watlow Controls, 1241 Bundy Blvd., P.O.Box 5580, Winona, MN 55987-5580, Phone: 507/454-5300, Fax: 507/452-4507 $5.00 W945-SA50-9210 March, 1992 Made in the U.S.A. Supersedes: Printed on Recycled Paper W945-SA40-9119 WATLOW Series 945 How to Use Data Communications...
Page 2: Table Of Contents
Contents Page Item Data Communications and the Series 945 Hardware Interfaces Protocols Communications Wiring RS-422A Interface Pinouts RS-423A Interface Pinouts (RS-232C Compatible) EIA-485 Interface Pinouts Connecting the Control and Computer Setting Hardware Protocol Switches Network Connections Series 945 Communication Parameters...
Page 3: With The Watlow Series
Prot = FULL. Communications Wiring To connect your Series 945 to a computer or printer, use the next three pages as a reference. Your computer or printer hardware manual will provide more detailed serial port pin information. Also refer to the noise prevention section in Appendix 1 of the Series 945 User's Manual.
Page 4: Rs-422A Interface Pinouts
The RS-422A 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 945. With RS-422A you can have from one to ten Series 945 controls connected to a single computer.
Page 5: Rs-423A Interface Pinouts (Rs-232C Compatible)
The RS-423A 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 945. With RS-423A you can have only one Series 945 control connected to a single computer or printer.
Page 6: Eia-485 Interface Pinouts
There is a 1 millisecond delay requried for the Series 945 to go between transmission and receipt of data. With EIA-485 you can have from one to thirty-two Series 945 controls connected to a computer.
Page 7: Network Connections
Both switches must be set the same for the desired protocol. To change the position of a switch, remove the power from the Series 945 and turn the front panel locking screw 90 counterclockwise. To remove the control chas- Control Chassis - Top View sis, grip the front panel bezel and pull it straight out from the control case.
Page 8 Prot = On and Log = tAbL, CHrt or SPCA, SPCd, SPCn. Parameter resets to default after a power interruption. Range: 0 to 23 WATLOW Series 945 8 n = 8 data bits and no parity On = XON - XOFF...
Page 9: Setup Menu
A = Alarm Set Points Range: PSA, PS -, P-A, P- -, -SA, -S-, --A, --- Setup Menu Use this page as a master copy for your Series 945 data communications Setup parameters. Do not enter any values here; make photocopies instead.
Page 10: Ascii Character Set
Table 2 - ASCII Character Dec Hex Char ASCII Char. Table 3 - ASCII Control Characters (Partial Set) WATLOW Series 945 ASCII Character Set Dec Hex Char Dec Hex Char 0A LF 1A SUB 0B VT 1B ESC 0C FF...
Page 11: Series 945 General Message Syntax
Series 945 General Message Syntax As soon as you link the devices, you'll be able to talk to the Series 945 using ASCII characters. The Series 945 will respond to any Operating or Setup parameter, plus some others. The control will respond to either upper or lower case ASCII characters from your computer.
Page 12: Example Format
Example Format For your benefit, we're presenting message/response examples with syntax re- quired for Series 945 communication. Information bracketed by < > indicates a description, rather than literal characters. We show each ASCII character that you must transmit to the Series 945, including space between the characters. (A "space"...
Page 13: Start And Stop Communicating With The Series 945 And Xon/Xoff
"=" Command Syntax with XON/XOFF Protocol: = <space> Data.1 <space> Data.2 <CR> With the "=" Command, Data.1 is the Series 945 parameter, in this case Alarm 1 Low, A1LO. Data.2 is the value you want to set for that parameter, in this example, 500.
Page 14: Xon/Xoff "=" Command Example
XON/XOFF "?" Command Example. Value The value of A1LO will be between rL (Range Low) and rH (Range High), say, 500. Response from the Series 945: <XOFF> <XON> <current value of A1LO> <CR> The hex response string is: 13113530300D ASCII...
Page 15: Device Address
A Watlow RS-422A multidrop network can handle up to 10 de- vices with this protocol. EIA-485 can handle up to 32 devices. Set the address number with the Series 945 in the Addr parameter under the Setup menu. Address...
Page 16: Stopping Communications In Ansi X3.28
'"=" command Syntax with ANSI X3.28 Protocol: <STX> = <space> Data.1 <space> Data.2 <ETX> With the "=" command, Data.1 is the Series 945 parameter, in this case Alarm 1 Low , A1LO. Data.2 is the value you want to set for that parameter, in this ex- ample, 500.
Page 17: Ansi X3.28 "=" Command Example
023F2041314C4F03 <STX> Space ASCII Characters Value 3F 20 First response from the Series 945: <ACK> The <ACK> hex response string is: Your computer's confirming response: <EOT> The <EOT> response hex string is: Second response from the Series 945: <STX> <current A1LO value> <carriage return> <ETX>...
Page 18: Command
READ ONLY. MODE BTYP RSP1 "?" Command The "?" Command reads a specific value of the Series 945 parameter (Data.1). Tables 5 and 6 provide the complete list of parameters you may use, plus re- sponses. WATLOW Series 945 Respns...
Page 19 "=" Command "The "=" Command sets a specific Series 945 parameter (Data.1) to a specific value (Data.2) when the unit is in the HOLD mode. Use Tables 5 and 6 to select parameters (Data.1) in the lefthand column. In Table 6 the low and high limit or code values (Data.2) are in the three center columns.
Page 20: Command
P = Process S = Set Point A = Alarm Set Point - - - = no logging LSL Upper 2 F/1 C YEAR WATLOW Series 945 Data.2 Low Limit High Limit rL USL Lower -2 F/-1 C -100 1 or 2*...
Page 21: Data Logging
The data logging feature is a convenient replacement for chart recorders. Informa- tion is sent directly from the Series 945 to a serial printer, or to a computer disk file. No computer is needed, although the 945 can be connected to a computer with a serial port and terminal emulation software.
Page 22: Table Printout
Juran's Quality Control Handbook by J.M. Juran, Editor in Chief & Frank M. Gryna, Associate Editor Hardcover, 1988 Available from: WATLOW Series 945 S = Set Points (C1) (SP1) (SP2) (A1LO) 01-01-92 PROCESS SET-1 SET-2 LOW-1 HIGH-1 LOW-2 HIGH-2 ATUNE...
Page 23: The Difference Between Control And Specification Limits
1 to 99. Default is 10. The LSL range is from -1 to -99. Default is -10. SPCn : There are no user defined values. The USL and LSL parameters are masked. How to Use Data Communications 3 standard deviations (3 sigma) USL - Mean CPKU = WATLOW Series 945...
Page 24: Chart And Spc Printout
At any time the control limits can be locked in by setting CLUP to "no" . If CLUP = no, new control limits can be set by CLUP = YEs. WATLOW Series 945 S = Set Points Set Point...
Page 25: Naks And Error Codes
All communications-related error codes are ER2 error codes, that is they are not considered cause for a shutdown of the 945 unit itself. There is always a communications error code generated when a <NAK> character is sent under the ANSI X3.28.
Page 26: Data Rules
End of Transmission (EOT), 17 ERR, 19 ER2, 19 Example Format, 12 Flow Control, 13 General Message Syntax, 11 How to Use Data Comms. with the Series 945, 3 HYSX, 20 WATLOW Series 945 Identification Number, 16 IN, 19 INDC, 20...
Page 27 Notes How to Use Data Communications WATLOW Series 945...
Page 28 Series 945 Data Communications User's Manual Watlow Controls, 1241 Bundy Blvd., Winona, MN 55987, Phone: 507/454-5300, Fax: 507/452-4507 WATLOW Series 945 How to Use Data Communications...