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Watlow Electric 945 Series, How To Use Manual

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5

WATLOW Series 945

How to Use Data Communications

RS-423A Interface Pinouts (RS-232C Compatible)

945A-XXXX-B000

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.

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.

945      #1

20

21

23

Signal Common

R

T

Com

Host Computer

(rear view)

T

Jumper to Signal Common

1

2

3

4
5

9

8

7

6

10

11

12

13

14

15

16

17

18

19

2  0

21

22

23

24

25

R

RLSD (Received  Line Signal Detector)

DSR (Data Set Ready)

RTS (Request To Send)

CTS (Clear To Send)

22

DB-25 female 

connector

(viewed from wire side)

R, and RLSD together.  

S and CTS together.  

mputer's user manual.

DTR (Data Terminal Ready)

3

4

RS-423A

Figure 2 -
RS-423A Interface,
Pin Designations.

   

NOTE:

The  Electronic
Industry Association
(EIA) RS-423A
standard recom-
mends a maximum
50 foot total point-
to-point distance.

Summary of Contents for 945 Series

Page 1: ...al 5 00 Made in the U S A Printed on Recycled Paper W945 SA50 9210 March 1992 Supersedes W945 SA40 9119 How To Use Data Communications with the Watlow Series 945 Watlow Controls 1241 Bundy Blvd P O Box 5580 Winona MN 55987 5580 Phone 507 454 5300 Fax 507 452 4507 ...

Page 2: ...ess 16 Starting Communications in ANSI X3 28 17 Stopping Communications in ANSI X3 28 17 ANSI X3 28 Command Example 18 ANSI X3 28 Command Example 19 Command 20 Command 22 Data Logging 23 Table Printout 23 Statistical Process Control SPC 24 The Difference Between Control and Specification Limits 25 Chart and SPC Printout 26 NAKs and Error Codes 26 User Responsibility 27 Index Figures Item 1 RS 422 ...

Page 3: ...tiple device network We also use XON XOFF Protocol a simpler protocol to run a two device network with an RS 423A interface XON XOFF will also work with the RS 422A and EIA 485 interface but the network is limited to two devices one computer or printer and a Series 945 XON XOFF Protocol requires no responses to messages like the ANSI X3 28 Protocol does Likewise ANSI X3 28 Protocol which provides ...

Page 4: ...ions 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 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...

Page 5: ... on the host computer may vary depending on models Refer to your computer user s manual for more information 945 1 20 21 23 Signal Common R T Com Host Computer rear view T Jumper to Signal Common 1 2 3 4 5 9 8 7 6 10 11 12 13 14 15 16 17 18 19 2 0 21 22 23 24 25 R RLSD Received Line Signal Detector DSR Data Set Ready RTS Request To Send CTS Clear To Send 22 DB 25 female connector viewed from wire ...

Page 6: ...mation T R T R EIA 485 Figure 3 EIA 485 Interface Pin Designations 19 20 23 T R T R Signal Common Optional Series 945 1 Series 945 31 Twisted Pair Wire 1 2 3 4 5 9 8 7 6 19 20 23 Signal Common Optional Twisted Pair Wire T R T R Com Host Computer rear view T R T R DB 9 female connector viewed from wire side NOTE The Electronic Industry Association EIA 485 standard recommends a maximum 4000 ft total...

Page 7: ...ssis Secure the front panel locking screw and reapply power Network Connections You can connect a data communication equipped Series 945 to any computer with an RS 422A or RS 423A RS 232C compatible or EIA 485 serial interface The serial interface is the key The IBM PC with an RS 232C serial output card for instance will talk to a single RS 423A equipped Series 945 For a multiple 945 network with ...

Page 8: ...d Log SPCA or SPCd SPCA Range rL to Lower USL 2 F 1 C Default rL SPCd Range 1 to 99 Default 10 Upper Specification Limit This value is the specified deviation above set point which statistically the process should not exceed Appears if Prot On and Log SPCA or SPCd SPCA Range rH to upper LSL 2 F 1 C Default rL SPCd Range 1 to 99 Default 10 Time Base Selects the time in minutes over which 30 random ...

Page 9: ...SI X3 28 2 2 A 3 FULL On XON XOFF Addr 0 to 31 0 Prot FULL Log OFF tAbL CHrt SPC OFF Prot On LSL SPCA rL to Lower USL 2 F 1 C rL Prot On SPCd 1 to 99 10 Log SPCA SPCd USL SPCA rH to Upper LSL 2 F 1 C rL Prot On SPCd 1 to 99 10 Log SPCA SPCd tbS 1 to 60 5 Prot On Log SPCA d n LinE 10 to 127 65 Prot On Log tAbL CHrt or SPCA d n YEAr 92 Prot On Log tAbL CHrt or SPCA d n Mon 01 Prot On Log tAbL CHrt o...

Page 10: ...S 24 18 CAN 40 28 56 38 8 09 09 HT 25 19 EM 41 29 57 39 9 10 0A LF 26 1A SUB 42 2A 58 3A 11 0B VT 27 1B ESC 43 2B 59 3B 12 0C FF 28 1C FS 44 2C 60 3C 13 0D CR 29 1D GS 45 2D 61 3D 14 0E SO 30 1E RS 46 2E 62 3E 15 0F SI 31 1F US 47 2F 63 3F Dec Hex Char Dec Hex Char Dec Hex Char Dec Hex Char 64 40 80 50 P 96 60 112 70 p 65 41 A 81 51 Q 97 61 a 113 71 q 66 42 B 82 52 R 98 62 b 114 72 r 67 43 C 83 53...

Page 11: ...unless otherwise noted Data can go up to seven total characters including a minus sign A or sign if used must be first and it must have a decimal point if applicable Data can use leading zeros Up to 7 digits Data does use decimal points Data 1 portion of message can be up to four total characters Series 945 General Message Syntax As soon as you link the devices you ll be able to talk to the Series...

Page 12: ...ter in turn will send a string similar to the one at the bottom of the example 3D2041314C4F20353030 Notice that we haven t mentioned protocol here or any characters added to this syntax by a protocol With XON XOFF the message above can be transmitted with only an additional Carriage Return CR hex 0D character at the end However the ANSI X3 28 Protocol requires an envelope of Start of Text STX hex ...

Page 13: ...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 Enter in ASCII space A1LO space 500 CR The hex string will be 3D2041314C4F203530300D Response from the Series 945 It sends an XOFF when a carriage return is received and then an XON when the unit is done processing the command The complete list of Command data parameters an...

Page 14: ...ing carriage return character Command syntax with XON XOFF Protocol space Data 1 CR Enter in ASCII space A1LO CR The hex string will be 3F2041314C4F0D 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 Characters HEX Value 1 41 4C 31 Space 3F 20 A L CR 0D 4F O 0 0 30 5...

Page 15: ...g the separate devices Furthermore if noise occurs somewhere in the system no parameter will change because noise can t comply with the protocol By placing messages inside a protocol envelope the messages are protected In the examples to come you ll see how this works The ANSI X3 28 Protocol requires STX characters at the beginning of a message and ETX characters at the end 34 05 ENQ 4 ASCII Chara...

Page 16: ...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 Enter in ASCII STX space A1LO space 500 optional carriage return ETX The hex string is 023D2041314C4F2035303003 Stopping Communications in ANSI X3 28 Protocol The master device your computer must end communications with Dev...

Page 17: ...5 ACK The ACK hex response string is 06 Your computer s confirming response EOT The EOT response hex string is 04 Second response from the Series 945 STX current A1LO value carriage return ETX The hex string is 023530302003 Your computer s next response ACK or NAK if the message needs to be repeated The hex string is 06 or 15 Final response from the Series 945 EOT The hex string is 04 Response fro...

Page 18: ...er overflow Only 1 ER2 response is valid 2 Receive buffer overflow 3 Framing error 4 Overrun error 5 Parity error 6 Talking out of turn 7 Invalid reply error 8 Noise error 16 Process input active 17 Local remote is local 18 Local remote is remote 19 Remote not enabled 20 Command not found 21 Parameter not found 22 Incomplete command line 23 Invalid character 24 Number of chars overflow 25 Input ou...

Page 19: ...control limits update CTX 1 60 Output X cycle time DAY 1 31 Day of the month data log DB 0 99 F Dead band 0 55 C 0 Units 99 Units DEC 0 2 0 No decimal point 1 0 0 2 0 00 DEX 0 00 9 99 Output X derivative DFL 0 1 0 US prompts 1 SI prompts HOUR 0 23 Hour for data logging HYSX 1 F 99 F Output X switching hys 1 C 55 C 1 Unit 99 Units INDC 1 1 1 UP DOWN key action INT 0 0 60 0 Time interval in minutes ...

Page 20: ...ies to Ot2 OT4 0 2 0 Output 4 Process Retransmit 1 Output 4 Set Point Retransmit 2 No action PBX 0 999 F Proportional Band 555 C dFL US 999 Units PBX 0 0 999 9 Output X proportional band DFL SI RAX 0 00 9 99 Rate REX 0 00 9 99 Reset RH Min IN range Max IN range Range High RL Min IN range Max IN range Range Low RSP 0 2 0 OFF 1 0 5 2 420 RTD 0 1 0 DIN 1 JIS SIL 0 1 0 Alarm silence OFF 1 Alarm silenc...

Page 21: ...e through the parameters until you reach bAUd and follow the parameter listing on Page 8 Select the appropriate data for each prompt and enter your values in the table on Page 9 Data logging begins once you return to the control set point After each line the 945 emits a carriage return Your printer can be set up to handle line feeds The printer must supply a line feed LF following a carriage retur...

Page 22: ...he Americas New York NY 10020 1 800 2 MCGRAW Data fields emitted are determined by the tag parameters and control configuration As in the following example tag is set for PSA Process Set Points and Alarm Set Points SET 2 is only transmitted when there is a secondary control output and is configured the same as the primary output In the example below notice A1LO was changed to 125 resulting in an a...

Page 23: ...iteria for signalling the need for action or for judging whether a set of data does or does not indicate a state of statistical control Lower Control Limit LCL Control limit derived by the average minus 3 standard deviation x 3σ Mean The arithmetic average obtained by adding all the values together and dividing by the number of values x Process Capability CPKL and CPKU A comparison of process perf...

Page 24: ...ontrol format are very similar The only difference is the SPC output displays the lower L and upper U control limit They are calculated based upon the mean value of the process variable and are derived from 30 random samples taken over the selected time base tbS the mean value used is from the previous timebase samples ex the mean from the first 30 samples is used to compute the control limits for...

Page 25: ...try the message again you may have made a syntax error See the error code listing in Table 5 Page 19 With XON XOFF protocol and the RS 423A interface the 945 sends no feedback on commands Therefore you may want to query the status of ER 2 after each command you send All communications related error codes are ER2 error codes that is they are not considered cause for a shutdown of the 945 unit itsel...

Page 26: ...A 485 3 6 End of Text ETX 13 End of Transmission EOT 17 ERR 19 ER2 19 Example Format 12 F Flow Control 13 G General Message Syntax 11 H How to Use Data Comms with the Series 945 3 HYSX 20 I Identification Number 16 IN 19 INDC 20 INT 20 Interface Wiring RS 422A Fig 1 4 RS 423A Fig 2 5 EIA 485 Fig 3 6 L LATX 21 LOC 21 LOG 8 21 22 L R 21 LSL 21 M MAN 21 MDL 19 Message Syntax 11 MODE 19 Multidrop 3 N ...

Page 27: ...How to Use Data Communications 27 WATLOW Series 945 Notes ...

Page 28: ...28 WATLOW Series 945 How to Use Data Communications Series 945 Data Communications User s Manual Watlow Controls 1241 Bundy Blvd Winona MN 55987 Phone 507 454 5300 Fax 507 452 4507 ...

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