Watlow 988 series User Manual
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Watlow 988 series User Manual

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Data Communications with the Watlow
Series 988 Family of Controllers
Includes:
981-984 Ramping
986-989 Temperature or Process
996-999 Dual Channel
PROCESS
L1
L2
DEV
% OUT
SERIES 982
1241 Bundy Blvd., P.O. Box 5580, Winona, Minnesota 55987-5580; Phone: (507) 454-5300;
W98F-XUMN Rev A03
Supersedes: W98F-XUMN Rev A02
June 1997
User's Manual
WA
TL W
PROCESS
L3
L4
L1
L2
DEV
DISPLAY
% OUT
HOLD
RUN
MODE
SERIES 988
Watlow Controls
Fax: (507) 452-4507
User Level Targeted:
• New User............................. Go to page 1.1
• Experienced User ................Go to page 2.1
• Expert User .........Go to page 5.1, 6.1 or 7.1
Installer:
• Wiring and installation......... Go to page 2.1
• Setup...................................Go to page 3.1
WA
TL W
PROCESS
L3
L4
1A
2A
CH A
DISPLAY
CH B
AUTO
MAN
MODE
SERIES 998
Made in the U.S.A.
Printed on Recycled Paper, 10% Post-consumer Waste.
WA
TL W
1B
2B
DISPLAY
AUTO
MAN
MODE
$5.00

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  • Page 1 Data Communications with the Watlow Series 988 Family of Controllers User's Manual Includes: User Level Targeted: 981-984 Ramping • New User......Go to page 1.1 986-989 Temperature or Process • Experienced User ....Go to page 2.1 996-999 Dual Channel • Expert User ..Go to page 5.1, 6.1 or 7.1 Installer: •...
  • Page 2 About This Manual How to Use this Manual We have designed this user’s manual to be a helpful guide to your new Watlow controller. The headlines in the upper right and left corners indicate which tasks are explained on that page. If you are a new user, we suggest that your read the first four chapters of this manual.

  • Page 3: Table Of Contents

    Table of Contents Data Communications with the Watlow Series 988 Family of Controllers Chapter 1 Introduction to Data Communications Machine-to-Machine Communication Example Format Protocol XON/XOFF Protocol for RS-232 A Protocol Example How to Communicate Using XON/XOFF RS-232, EIA-485 and RS-422 Interfaces How to Communicate Using ANSI X3.28...
  • Page 4 Table of Contents NOTES Data Communications with the Watlow Series 988 Family of Controllers Table of Contents...

  • Page 5: Introduction To Data Communications

    The remote devices are busy controlling heaters to specific set points. PC-1 monitors and changes the instructions that each remote device uses to control its heaters. Introduction to Data Communications, Chapter 1 Data Communications with the Watlow Series 988 Family...
  • Page 6 — you know that your letter has been received because the post office sends you a signed receipt. In Watlow data communications, a dialog will continue successfully as long as the messages are in the correct form and responses are returned to the protocol leader.

  • Page 7: Rs-232, Eia-485 And Rs-422 Interfaces

    Of these three interfaces, EIA-485 has the lowest impedance, a multiple-device capability, greatest noise immunity and the longest distance capability — up to 4,000 feet of total network cable length. Introduction to Data Communications, Chapter 1 Data Communications with the Watlow Series 988 Family...

  • Page 8: Ascii

    1 to a 0 in the character frame, the receiver would detect that 7-bit character bit position: 1 Figure 1.4 - ASCII upper case "W" (1010111). odd parity bit Data Communications with the Watlow Series 988 Family Introduction to Data Communications, Chapter 1...

  • Page 9: Start And Stop Bits

    Program- mers use languages to enable computers to do real work. We're providing a pilot program written in Quick BASIC to demonstrate data communications with Watlow controllers. You can download it ("comms4.zip" and "comms4tm.zip") from the Watlow BBS, (507) 454-3958.

  • Page 10: Syntax

    (remote) as the computer sends a set point data command to the controller. That's really all there is to it. Remember — only the "master" may initiate ex- changes and every message requires a response. Data Communications with the Watlow Series 988 Family Introduction to Data Communications, Chapter 1...
  • Page 11 <ACK> ("I understand [the answer].") controller <EOT> ("That's all, go ahead.") The computer ends the session. computer <DLE> <EOT> ("Disconnect, please. That's all." [master waits]) Introduction to Data Communications, Chapter 1 Data Communications with the Watlow Series 988 Family...
  • Page 12 Introduction NOTES Data Communications with the Watlow Series 988 Family Introduction to Data Communications, Chapter 1...

  • Page 13: Hardware And Wiring

    Tel: (815) 433-5100 or Fax: (815) 434-7094 or Web: http://www.bb-elec.com For EIA-422/ EIA-485 (RS-422/ RS-485), part number: 485OIC with a power supply and the correct 25 pin connector for your computer. Hardware and Wiring, Chapter 2 Data Communications with the Watlow Series 988 Family...

  • Page 14: Communications Wiring

    14 15 16 17 18 19 20 21 22 23 24 25 Wiring Diagrams. • • • • • • • • • • • • DB-25 female viewed from wire side (typical connections with jumpers) Data Communications with the Watlow Series 988 Family Hardware and Wiring, Chapter 2...

  • Page 15: Eia-485 Interface Wiring

    Figure 2.3 - card. Pull-up and pull-down resistors resistors. EIA-485 Interface may be needed to maintain the correct Wiring Diagrams. voltage during the idle state. Hardware and Wiring, Chapter 2 Data Communications with the Watlow Series 988 Family...

  • Page 16: Rs-422 Interface Wiring

    A typical value would be 240Ω. the User's Pull-up and pull-down resistors may be needed to Manual.) maintain the correct voltage during the idle state. Data Communications with the Watlow Series 988 Family Hardware and Wiring, Chapter 2...

  • Page 17: Communications Setup

    988/989 controllers. We also offer a simple MS-DOS™ communications demonstration program for the Series 981-984, 986-989 and 996-999. Ask your Watlow field sales representative for a copy of the "Comm 4" program, or you can download it ("comms4.zip" and "comms4tm.zip") from the Watlow BBS, (507) 454- 3958.

  • Page 18: Setup At The Controller's Front Panel

    [`485] = EIA-485 Interface type [`485] Menu Prompts and [`422] = RS-422 Interface type Descriptions. [IntF] "U" hardware [`232] = RS-232 Interface type [`232] [`485] = EIA-485 Interface type Communications Setup, Chapter 3 Data Communications with the Watlow Series 988 Family...

  • Page 19: Sending Commands

    Chapters 5, 6 and 7. Returns the value of a specific prompt from the controller. Sets a specific prompt in the controller to a specific value. Data Communications with the Watlow Series 988 Family Sending Commands, Chapter 4...

  • Page 20: Example Format

    (hex 0D) at the end of every message. How To Communicate Using XON/XOFF XON/XOFF protocol is used when one master is networked with only one control- ler. Your personal computer must generate the master’s messages. Data Communications with the Watlow Series 988 Family Sending Commands, Chapter 4...

  • Page 21: How To Communicate Using Ansi X3.28

    • The master must wait for the remote device to respond to every message within a reasonable period. If no response occurs, retry the connection or pursue error recovery. Data Communications with the Watlow Series 988 Family Sending Commands, Chapter 4...

  • Page 22: Device Addresses

    ANSI X3.28 Device Addresses A Watlow RS-422 multidrop network can handle up to 10 devices with this protocol. EIA-485 can handle up to 32 devices. Set the address number of the controller with the address prompt [Addr] under the Setup Menu [`SEt].

  • Page 23: Ansi X3.28 Protocol Example

    • End the communications link and re-establish it with <DLE> and <ENQ> only when changing to a new device at a different address. The master can communicate repeatedly with a specific device once the initial data link is established. Data Communications with the Watlow Series 988 Family Sending Commands, Chapter 4...

  • Page 24: Modbus Rtu

    Checksum (CRC) for error detection. Packet format: | nn | nn | nnnn… | nn nn | ∆ ∆ ∆ ∆ ∆ ∆ address command registers and/or data Data Communications with the Watlow Series 988 Family Sending Commands, Chapter 4...
  • Page 25 (one byte) write to a register command (0x06) register high byte register low byte data high byte data low byte CRC low byte CRC high byte Data Communications with the Watlow Series 988 Family Sending Commands, Chapter 4...
  • Page 26 Example: Run loop back test on controller at address 40 (0x28). Sent: 28 08 55 66 77 88 31 B7 Received: 28 08 55 66 77 88 31 B7 Data Communications with the Watlow Series 988 Family Sending Commands, Chapter 4...
  • Page 27 Example: Exception 03 - Cannot write 12,000 (0x2EE0) to register 7, out of range, illegal data value. Sent: 01 06 00 07 2E E0 24 23 Received: 01 86 03 02 61 Data Communications with the Watlow Series 988 Family Sending Commands, Chapter 4...

  • Page 28: Cyclical Redundancy Checksum (Crc)

    ^= POLYNOMIAL; / * If the LSB is 0, shift the CRC only */ else{ crc >>= 1; } while(bit_count++ < 7); } while(char_ptr++ < end_of_packet); return(crc); Data Communications with the Watlow Series 988 Family Sending Commands, Chapter 4 4.10...

  • Page 29: Command Summary Of The Series

    LAT3 ATSP SIL3 PTYP Table 5.1 - Download Sequence. * Wait at least two seconds after executing this command before going on to the next command. Command Summary Series 981-984, Chapter 5 Data Communications with the Watlow Series 988 Family...

  • Page 30: Run/Hold Mode And Prompt Accessibility

    * This command is accessible only in the run mode for software revisions before and including REV H. ** These commands are accessible in the run and hold modes for software revisions after and including REV I. Data Communications with the Watlow Series 988 Family Command Summary Series 981-984, Chapter 5...
  • Page 31 110 = Alarm 3 0 = off 1 = HI 2 = LO Ambient Terminal ? <sp> AMB <cr> Input 1 terminals in 0.0°F 1500 Temperature Command Summary Series 981-984, Chapter 5 Data Communications with the Watlow Series 988 Family...
  • Page 32 Default: 0°F, 0°C, or 0 units Derivative ? <sp> DE1 <cr> 0.00 to 9.99 minutes Output 1 PID = <sp> DE1 <sp> data.2 <cr> Default: 0.00 Data Communications with the Watlow Series 988 Family Command Summary Series 981-984, Chapter 5...
  • Page 33 5 = Input 2 A-D overflow 6 = Input 2 overrange 7 = Input 2 underrange 8 = Input 2 A-D underflow 9 = Ambient error Command Summary Series 981-984, Chapter 5 Data Communications with the Watlow Series 988 Family...
  • Page 34 HYS3 Output 3 Hysteresis ? <sp> HYS3 <cr> 0°F to 999°F = <sp> HYS3 <sp> data.2 <cr> 0°C to 555°C 0 units to 999 units Default: 3°F, 2°C, or 3 units Data Communications with the Watlow Series 988 Family Command Summary Series 981-984, Chapter 5...
  • Page 35 Alarm 3 Latching ? <sp> LAT3 <cr> 0 = Latching alarms or IN1 setting. = <sp> LAT3 <sp> data.2 <cr> 1 = Non-latching alarms Default: 1 Command Summary Series 981-984, Chapter 5 Data Communications with the Watlow Series 988 Family...
  • Page 36 ? <sp> OT3 <cr> 0 = None = <sp> OT3 <sp> data.2 <cr> 1 = Alarm 3 2 = Alarm 3 reverse acting 3 = Event 3 (ENT3) Data Communications with the Watlow Series 988 Family Command Summary Series 981-984, Chapter 5...
  • Page 37 PSTR Program Start Point ? <sp> PSTR <cr> 0 = Start @ current process value 1207 = <sp> PSTR <sp> data.2 <cr> 1 = Start @ hold mode set point Default: 1 Command Summary Series 981-984, Chapter 5 Data Communications with the Watlow Series 988 Family...
  • Page 38 16 = Rev Q 7 = Rev H 17 = Rev R 8 = Rev I 18 = Rev S 9 = Rev J 19 = Rev T 5.10 Data Communications with the Watlow Series 988 Family Command Summary Series 981-984, Chapter 5...
  • Page 39 4 = Output 4 on NOTE: The number of decimal places returned by many of these com- mands is deter- mined by the DEC1 or IN1 setting. Command Summary Series 981-984, Chapter 5 Data Communications with the Watlow Series 988 Family 5.11...

  • Page 40: Ramping Controller Mtr Command

    MTR memory. command more than Continuous writes once every five may result in seconds. premature control failure, system downtime and damage to processes and equipment. 5.12 Data Communications with the Watlow Series 988 Family Command Summary Series 981-984, Chapter 5...

  • Page 41: Ramping Controller Stp Command

    <FILE#> <STEP#> <STYP> <END> (Program 1 to 4 1 to 6 (Step (End a Step) Type) Status) 0= End 0 = Hold 1 = off Command Summary Series 981-984, Chapter 5 5.13 Data Communications with the Watlow Series 988 Family...

  • Page 42: Ramping Controller Commands Table

    Type PROGRAM command for an End Step Step Register # 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 Parameter File Step Type 5.14 Data Communications with the Watlow Series 988 Family Command Summary Series 981-984, Chapter 5...
  • Page 43 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 Command Summary Series 981-984, Chapter 5 5.15 Data Communications with the Watlow Series 988 Family...
  • Page 44 40723 722 SIL2 41906 1905 HUNT 40503 40726 725 ANUN 41907 1906 LRNL 40504 40735 734 41908 1907 LRNH 40505 40737 736 40506 40738 737 HYS3 5.16 Data Communications with the Watlow Series 988 Family Command Summary Series 981-984, Chapter 5...

  • Page 45: Command Summary Of The Series

    Table 6.1 - SIL2 RE2A Download IT2A Sequence. A3SD RA2A * Wait at least two seconds after executing this command before going on to the next command. Data Communications with the Watlow Series 988 Family Command Summary Series 986-989, Chapter 6...
  • Page 46 The number of Bit 4 = A3HI (0000 1000) decimal places returned by many of these commands is determined by the DEC1, DEC2, IN1 or IN2 setting. Data Communications with the Watlow Series 988 Family Command Summary Series 986-989, Chapter 6...
  • Page 47 2 = No read or write Default: 0 CSAC Cascade Action ? <sp> CSAC <cr> 0 = direct action = <sp> CSAC <sp> data.2 <cr> 1 = reverse action Data Communications with the Watlow Series 988 Family Command Summary Series 986-989, Chapter 6...
  • Page 48 ? <sp> DIAG <cr> 0 = No lockout Diagnostics Menu = <sp> DIAG <sp> data.2 <cr> 1 = Read only 2 = No read or write Default: 0 Data Communications with the Watlow Series 988 Family Command Summary Series 986-989, Chapter 6...
  • Page 49 = <sp> FAIL <sp> data.2 <cr> Heat/cool manual = -100 to 100% Heat only manual = 0% to 100% Cool only manual = -100% to 0% Default = Bumpless Data Communications with the Watlow Series 988 Family Command Summary Series 986-989, Chapter 6...
  • Page 50 20 = 1-5VÎ (dc); -999 to 9999 units 21 = 0-10VÎ (dc); -999 to 9999 units 23 = 0-50mVÎ (dc); -999 to 9999 units 24 = 0-100mVÎ (dc); -999 to 9999 units Data Communications with the Watlow Series 988 Family Command Summary Series 986-989, Chapter 6...
  • Page 51 4 = Input off 5 = Universal RTD 6 = Universal high gain t/c 7 = Universal low gain t/c 8 = Universal millivolts 9 = Universal process Data Communications with the Watlow Series 988 Family Command Summary Series 986-989, Chapter 6...
  • Page 52 ? <sp> OT2 <cr> 0 = Heat = <sp> OT2 <sp> data.2 <cr> 1 = Cool 2 = None 3 = Alarm 2 4 = Alarm 2 reverse acting Data Communications with the Watlow Series 988 Family Command Summary Series 986-989, Chapter 6...
  • Page 53 = <sp> PIDB <sp> data.2 <cr> 1 = Read only determined by the 2 = No read or write DEC1, DEC2, IN1 Default: 0 or IN2 setting. Data Communications with the Watlow Series 988 Family Command Summary Series 986-989, Chapter 6...
  • Page 54 Range High ? <sp> RH2 <cr> min. IN2 range to to max. IN2 range Input 2 = <sp> RH2 <sp> data.2 <cr> Default: Sensor high range 6.10 Data Communications with the Watlow Series 988 Family Command Summary Series 986-989, Chapter 6...
  • Page 55 CNTL = 2 (ratio), then 0.0 to 20.0 if CNTL = 3 (differential), then -999 to 999 if ATM = 1, then 0 to 100% Default: per IN1 and hardware Data Communications with the Watlow Series 988 Family 6.11 Command Summary Series 986-989, Chapter 6...
  • Page 56 NOTE: The number of decimal places returned by many of these commands is determined by the DEC1, DEC2, IN1 or IN2 setting. 6.12 Data Communications with the Watlow Series 988 Family Command Summary Series 986-989, Chapter 6...
  • Page 57 40140 139 40095 ACAL 40045 DE2B 40141 140 40096 40046 CT2B 40142 141 SOFT 40097 FAIL 40047 40143 142 40098 40144 143 SPEE 40145 144 INSP Data Communications with the Watlow Series 988 Family 6.13 Command Summary Series 986-989, Chapter 6...
  • Page 58 Temperature/process Controller Prompt Table Name Description Read (?) and/or Write (=) Syntax Range Notes data.1 data.2 Modbus address 6.14 Data Communications with the Watlow Series 988 Family Command Summary Series 986-989, Chapter 6...

  • Page 59: Command Summary Of The Series

    GLBL PRCB RE2A HY1B IT2A DIAG HY2B RA2A DE2A * Wait at least two seconds after executing this command before going on to the next command. Command Summary Series 996-999, Chapter 7 Data Communications with the Watlow Series 988 Family...
  • Page 60 Default: RH1 or RH2 per AOUT Retransmit ? <sp> ARL <cr> -999 to ARH Range Low = <sp> ARL <sp> data.2 <cr> Default: RL1 or RL2 per AOUT Data Communications with the Watlow Series 988 Family Command Summary Series 996-999, Chapter 7...
  • Page 61 Mech relay: 5.0 to 999.9 sec. Default: 1.0 or 30.0 sec. DATE Factory ? <sp> DATE <cr> xxyy Test Date xx = Week yy = Year Command Summary Series 996-999, Chapter 7 Data Communications with the Watlow Series 988 Family...
  • Page 62 5 = Input 2 A-D overflow 6 = Input 2 overrange 7 = Input 2 underrange 8 = Input 2 A-D underflow 9 = Ambient error Data Communications with the Watlow Series 988 Family Command Summary Series 996-999, Chapter 7...
  • Page 63 HYS3 Output 3 Hysteresis ? <sp> HYS3 <cr> 0°F to 999°F = <sp> HYS3 <sp> data.2 <cr> 0°C to 555°C 0 units to 999 units Default: 3°F, 2°C or 3 units Command Summary Series 996-999, Chapter 7 Data Communications with the Watlow Series 988 Family...
  • Page 64 0 = No input menu lockout 1309 = <sp> INPT <sp> data.2 <cr> 1 = Read only 2 = No read or write allowed Default: 0 Data Communications with the Watlow Series 988 Family Command Summary Series 996-999, Chapter 7...
  • Page 65 Output 3 Action ? <sp> OT3 <cr> 0 = None = <sp> OT3 <sp> data.2 <cr> 1 = Alarm 3 2 = Alarm 3 reverse acting Command Summary Series 996-999, Chapter 7 Data Communications with the Watlow Series 988 Family...
  • Page 66 DFL = 0 and IN1 = a process value, then 0 to 999 units if DFL = 1, then 0.0 to 99.9% of span Default: 25°F, 14°C, 25 units, or 3.0% Data Communications with the Watlow Series 988 Family Command Summary Series 996-999, Chapter 7...
  • Page 67 Range Low ? <sp> RL2 <cr> min. IN2 range to to max. IN2 range Input 2 = <sp> RL2 <sp> data.2 <cr> Default: Sensor low range Command Summary Series 996-999, Chapter 7 Data Communications with the Watlow Series 988 Family...
  • Page 68 ? <sp> SYS <cr> 0 = No lockout 1306 Menu = <sp> SYS <sp> data.2 <cr> 1 = Read only 2 = No read or write Default: 0 Data Communications with the Watlow Series 988 Family Command Summary Series 996-999, Chapter 7 7.10...
  • Page 69 NOTE: The number of decimal places returned by many of these com- mands is deter- mined by the DEC1, DEC2, IN1 or IN2 setting. Command Summary Series 996-999, Chapter 7 Data Communications with the Watlow Series 988 Family 7.11...
  • Page 70 41904 1903 OT3S 40702 PRCA 40512 511 IT2A 40717 OT2A 40513 512 RE2A 40718 OT1B 40514 513 DE2A 40719 PRCB 40515 514 RA2A 40734 OT2B Data Communications with the Watlow Series 988 Family Command Summary Series 996-999, Chapter 7 7.12...

  • Page 71: Appendix

    For example, do not send an A2LO Continuous writes command to a unit not equipped with an alarm for output 2. may result in premature control failure, system downtime and damage to pro- cesses and equip- ment. Appendix Data Communications with the Watlow Series 988 Family...
  • Page 72 Ctrl C End of Text Ctrl D End of Transmission Ctrl P Data Link Escape Table A.2b - Ctrl M Carriage Return ASCII Control Ctrl Q Characters (Partial Set). Ctrl S XOFF Data Communications with the Watlow Series 988 Family Appendix...

  • Page 73: Index

    COM Menu [COM] 3.2 Diagnostics Menu Lockout [DIAG] 986-989 6.16 Prompts 3.2 986-989 6.9 996-999 7.10 command list 4.1 996-999 7.4 Type [AL3] Comms Menu Lockout [COM] DISPLAY key 1.6 981-984 5.3 Appendix Data Communications with the Watlow Series 988 Family...
  • Page 74 996-999 7.6 981-984 5.4 986-989 6.8 Value [C2] 986-989 6.9 996-999 7.3 981-984 5.4 996-999 7.3 Decimal Point [DEC1] 986-989 6.8 Filter Time Constant 981-984 5.5 996-999 7.3 981-984 [FTR1] 5.6 Data Communications with the Watlow Series 988 Family Appendix...
  • Page 75 Reset [RE1] Hardware Type [OTY3] 996-999 7.11 981-984 5.10 981-984 5.9 Low Power Limit [LOP] Reset PID [RE1A], [RE1B] 986-989 6.14 981-984 5.8 986-989 6.15 996-999 7.8 986-989 6.13 996-999 7.9 Appendix Data Communications with the Watlow Series 988 Family...
  • Page 76 996-999 7.9 986-989 6.11 remote device 1.1 Process Value for PID Switch [PROC] Slidewire Hysteresis [SHYS] 6.16 Remote Set Point [RSP] 986-989 6.15 986-989 6.16 Program a File Step [STP] 981-984 5.11 Data Communications with the Watlow Series 988 Family Appendix...
  • Page 77 Input 1 [C1] 981-984 5.4 986-989 6.8 996-999 7.3 Input 2 [C2] 981-984 5.4 986-989 6.8 996-999 7.3 waitfor event 5.5 wiring 2.1 XOFF character 4.2 XON character 4.2 XON/XOFF protocol 3.1-3.2, 4.2-4.3, Appendix Data Communications with the Watlow Series 988 Family...
  • Page 78 Notes Data Communications with the Watlow Series 988 Family Appendix...
  • Page 79 Series 981-984, 986-989 and 996-999 Data Communications User's Manual Watlow Controls, 1241 Bundy Blvd., P.O. Box 5580, Winona, MN 55987-5580; Phone: (507) 454-5300; Fax: (507) 452-4507...

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