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Introduction to Data Communications, Chapter 1

Data Communications with the Watlow Series 988 Family

1.3

Interfaces

0V

1 bit

0 bit

-12V

+12V

Bit signals on an RS-232 interface.

+5V

0V

-5V

1 bit

1 bit

+5V

0V

-5V

0 bit

Bit signals on an RS-422 interface.

Bit signals on an EIA-485 interface.

Figure 1.3 - Interface
bit signals.

An EIA-485 interface uses three wires: a T+/R+; a  T-/R-; and a common line. A -5-
volt signal is interpreted as a 1, a +5-volt signal as a 0. Up to 32 remote devices
can be connected to a master on a multi-drop network up to 4,000 feet long.

The RS-422 interface uses five wires: a "talk" pair; a "listen" pair; and a common
line. It can handle one master and up to ten remote devices in a multidrop network
up to 4,000 feet long. RS-422 uses the difference in voltage between the two wires
to indicate a 1 or a 0 bit. A 1 is a difference of +5 volts, while a 0 is a difference of
-5 volts.

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.

RS-232, EIA-485 and RS-422 Interfaces

The three interfaces we're concerned with on this controller are RS-232, EIA-485
and RS-422.

An RS-232 interface uses three wires: a single transmit wire; a single receive wire;
and a common line. Only two devices can use an RS-232 interface. A -12 volt
signal indicates a 1 and a +12 volt signal indicates a 0. The RS-232 signal is
referenced to the common line rather than to a separate wire, as in EIA-485 and
RS-422. An RS-232 cable is limited to 50 feet, due to noise susceptibility.

0 bit

Содержание 988 series

Страница 1: ...F XUMN Rev A03 Supersedes W98F XUMN Rev A02 June 1997 Printed on Recycled Paper 10 Post consumer Waste User Level Targeted New User Go to page 1 1 Experienced User Go to page 2 1 Expert User Go to pag...

Страница 2: ...l a lightning bolt in a triangle precedes an electric shock hazard CAUTION or WARNING safety statement Technical Assistance If you encounter a problem with your Watlow controller review all of your co...

Страница 3: ...nt Panel Chapter 4 Sending Commands 4 1 General Message Syntax 4 1 Message Syntax 4 1 Data Rules 4 1 Command List 4 2 Example Format 4 2 XON XOFF Protocol for RS 232 4 2 How to Communicate Using XON X...

Страница 4: ...Table of Contents Data Communications with the Watlow Series 988 Family of Controllers IV Table of Contents NOTES...

Страница 5: ...a 1 or a 0 A byte is a string of seven or eight bits which a computer treats as a single character The ASCII pronounced asky character set uses a unique seven bit byte to represent each letter digit a...

Страница 6: ...age PC 1 says OK D 2 says That s all your turn PC 1 then takes the protocol lead and says Thank you that s all D 2 hangs up disconnect That s basically how the connect message and disconnect protocols...

Страница 7: ...work up to 4 000 feet long RS 422 uses the difference in voltage between the two wires to indicate a 1 or a 0 bit A 1 is a difference of 5 volts while a 0 is a difference of 5 volts Of these three int...

Страница 8: ...We are declaring that the number of 1s in the 8 bit character frame will be either always odd or always even To do that about half the time we ll have to add another 1 to get an odd or an even number...

Страница 9: ...ase stop bit Both help the listener understand the message 7 bit character 1 2 3 4 5 6 7 8 1 0 idle line start bit stop bit odd parity bit Figure 1 5 ASCII upper case W with start and stop bits Baud R...

Страница 10: ...int data and a protocol ETX End of Text control character The whole phrase would look like this STX SP1 0500 ETX ASCII Control Character Definitions ENQ Enquiry inquiry Request for a data link ACK Ack...

Страница 11: ...s the session computer 2 ENQ 2 are you there controller 2 ACK I m 2 I m here computer STX space SP1 space 500 return ETX Here comes a message Make SP1 500 I m done with the message controller ACK I un...

Страница 12: ...1 8 Introduction to Data Communications Chapter 1 Data Communications with the Watlow Series 988 Family Introduction NOTES...

Страница 13: ...__ If your controller is supplied with a U board you can select via the comms menu either EIA 232 or EIA 485 opera tion The IntF parameter is defaulted to EIA 232 To select the multidrop interface ent...

Страница 14: ...e typical connections with jumpers Receive 6 Figure 2 2 RS 232 Interface Wiring Diagrams DB 9 Pinouts 1 DCD 2 receive 3 transmit 4 DTR 5 common 6 DSR 7 RTS 8 CTS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16...

Страница 15: ...iation EIA 485 standard recommends a maximum total network distance of 4 000 feet Com T R T R B A Gnd Converter Box or Card Controller 1 Controller 2 T R 3 As many as 32 units can be connected to an E...

Страница 16: ...ciation EIA RS 422 standard recom mends a maximum network distance of 4 000 feet Figure 2 4 RS 422 Interface Wiring Diagrams Com T T R R B A B A Gnd Converter Box or Card Controller 1 Com 7 R 6 R 5 T...

Страница 17: ...er To run a two device network with an RS 232 interface you can also use XON XOFF Protocol a simpler protocol XON XOFF will also work with the RS 422 and EIA 485 interface but the network is limited t...

Страница 18: ...ype 485 422 RS 422 Interface type TL W WA PROCESS L1 L2 L3 L4 DEV OUT DISPLAY MODE HOLD RUN SERIES 988 Figure 3 2 The Communications Menu Setup at the Controller s Front Panel Press the and keys simul...

Страница 19: ...haracter space or sp is simply a delimiter an ASCII space character hex 20 Data fields are prompts and values specific to the command The number of data fields depends on the particular command The fi...

Страница 20: ...ove 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 02 and End of Text ETX hex 0...

Страница 21: ...t response is not received in three seconds How to Communicate Using ANSI X3 28 The ANSI X3 28 protocol provides high quality communications by requiring a response to every message With a multiple de...

Страница 22: ...his 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 Table 4 4 Address to ASCII Conversion for ANSI X3 28 Pro...

Страница 23: ...r NAK The command was not understood Re send corrected message Master EOT The host gives the device permission to respond Remote STX 500 ETX The device sends back the requested value Do not send a res...

Страница 24: ...n on the Modbus provides information for writing a software application that uses Modbus Writing a Modbus Application You need to code messages in eight bit bytes with no parity bit Negative parameter...

Страница 25: ...er data low byte first register data high byte register n data high byte register n data low byte CRC low byte CRC high byte Example Read register 0 model number of the controller at address 1 Sent 01...

Страница 26: ...ister low byte number of registers to write high byte 0x00 number of registers to write low byte must be 0x01 number of data bytes must be 0x02 data high byte data low byte CRC low byte CRC high byte...

Страница 27: ...mand 0x80 exception code 0x01 or 0x02 or 0x03 CRC low byte CRC high byte Messages with the wrong format timing or CRC are ignored A read command sent to an inactive parameter returns 0x0000 Example Ex...

Страница 28: ...pend it to the packet define POLYNOMIAL 0xA001 unsigned int calc_crc unsigned char start_of_packet unsigned char end_of_packet unsigned int crc unsigned char bit_count unsigned char char_ptr Start at...

Страница 29: ...ected results because some prompts change the values of other prompts Copy this page and use the checkboxes Table 5 1 Download Sequence Complete Parameter Download Sequence When you download a complet...

Страница 30: ...tifies the prompts accessible in run or hold and those available in run only Others not specifically identified are accessible in the hold mode only RUN Only Mode RUN or HOLD MODE CSP ALM EJC C1 ENSP...

Страница 31: ...min ABSP Abort Set Point sp ABSP cr off 1211 sp ABSP sp data 2 cr RL to RH ACAL Calibration Offset for sp ACAL cr 999 F to 999 F 746 Retransmit Output sp ACAL sp data 2 cr 555 C to 555 C 999 to 999 u...

Страница 32: ...CAL2 Input 2 Calibration sp CAL2 cr 999 F to 999 F 615 Offset sp CAL2 sp data 2 cr 555 C to 555 C 999 units to 999 units Default 0 CF Degrees Select sp CF cr 0 Display F 901 Display Loop sp CF sp dat...

Страница 33: ...EI1S cr 0 Open off 201 1 Closed on EI2 Event Input 2 sp EI2 cr 0 None 1062 Function sp EI2 sp data 2 cr 1 Lock out keyboard 2 Alarm reset 3 Turn control outputs off 4 Hold profile 5 Start file 1 6 St...

Страница 34: ...1 sp FTR1 sp data 2 cr Default 0 GSD Guaranteed Soak sp GSD cr 0 F to 999 F 1205 Deviation sp GSD sp data 2 cr 0 C to 999 C 0 to 999 units 0 disabled Default 0 F 0 C or 0 units HIP High Power Limit s...

Страница 35: ...0mV dc 999 to 9999 units 24 0 100mV dc 999 to 9999 units IN2 Input 2 Type sp IN2 cr 26 Slidewire off 611 sp IN2 sp data 2 cr 27 Slidewire 100 to 1200 32 Event input 2 off 33 Event Input 2 on IT1 Integ...

Страница 36: ...2 cr 0 Mode to previous prompt 1900 1 Mode to next prompt MTR Monitor the sp MTR cr See Key Command MTR at the 1200 currently running end of this chapter for full response step syntax This key comman...

Страница 37: ...PB2 cr if DFL 0 and CF 1 then 0 to 555 C 510 Output 2 sp PB2 sp data 2 cr if DFL 0 and CF 0 then 0 to 999 F if DFL 0 and In1 a process value then 0 to 999 units if DFL 1 then 0 0 to 99 9 of span Defa...

Страница 38: ...sp RHS cr 0 Hold 200 1 Run 2 Pre run RL1 Range Low sp RL1 cr min IN1 range to max IN1 range 602 Input 1 sp RL1 sp data 2 cr Default sensor low range RL2 Range Low sp RL2 cr min IN2 range to max IN2 ra...

Страница 39: ...g SP1 Set Point 1 sp SP1 cr RL1 to RH1 300 sp SP1 sp data 2 cr Default per IN1 and hardware set SP1 to RL1 1 to turn all outputs off SHYS Slidwire sp SHYS cr 0 to Hunt 1904 Hysteresis sp SHYS sp data...

Страница 40: ...rocess disabled or unavailable Range RL1 to RH1 FILE 1 to 4 STEP 1 to 6 STYP Step Type 1 SP Set Point RATE 0 to 360 F 0 to 200 C or 0 to 360 units SP RL to RH DFLT 75 F 25 C 75 units or RL if the abov...

Страница 41: ...bled or unavailable 0 DSBL 1 on 2 off WPR Wait for Process disabled or unavailable Range RL1 to RH1 RLI 1 DSBL Soak Step Syntax STP Program a step FILE 1 to 4 STEP 1 to 6 STYP Step Type 1 SP Set Point...

Страница 42: ...58 1259 1260 Parameter 2 File Step Type Hour Min Sec PROGRAM command for a Jump Loop Step Register 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 Parameter 2 File Step Type JF JS PROGRAM comma...

Страница 43: ...1 1272 1273 ES3 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 ES3 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 WE WP ES3 1261 1262 1263 1264 1265 1266 1267 1268...

Страница 44: ...45 ARH 40747 746 ACAL 40901 900 DFL 40902 901 CF 41061 1060 EI1 41063 1062 EI2 41201 1200 MTR 41202 1201 STP 41203 1202 CSP 41204 1203 EJC 41205 1204 ENSP 41206 1205 GSD 41207 1206 POUT 41208 1207 PST...

Страница 45: ...M DIAG CAL OPLP SPEE Complete Parameter Download Sequence When you download a complete set of parameters to a controller you must load them in this order The user s manual has more information about p...

Страница 46: ...cr Process A3LO to sensor high range 16 sp A3HI sp data 2 cr Deviation 0 to 9999 Rate 0 to 9999 minute Default RH 999 or 999 min A3LO Output 3 Alarm Low sp A3LO cr Process sensor low range to A3HI 15...

Страница 47: ...tune sp ATSP cr 50 to 150 109 Set Point sp ATSP sp data 2 cr Default 90 C1 Input 1 Value sp C1 cr Based on IN1 range RL1 to RH1 1 C2 Input 2 Value sp C2 cr Based on IN2 range RL2 to RH2 2 CAL Lockout...

Страница 48: ...cr 555 C to 555 C 999 units to 999 units Default 0 F 0 C or 0 units DE1A Derivative sp DE1A cr 0 00 to 9 99 minutes 25 Output 1 PID Set A sp DE1A sp data 2 cr Default 0 00 DE2A Derivative sp DE2A cr 0...

Страница 49: ...2 Input 1 overrange 3 Input 1 underrange 4 Input 1 A D underflow 5 Input 2 A D overflow 6 Input 2 overrange 7 Input 2 underrange 8 Input 2 A D underflow 9 Ambient error 10 Heater 11 Open loop ER2 Err...

Страница 50: ...its to 999 units Default 3 F 2 C or 3 units IDSP Idle Set Point sp IDSP cr RL1 to RH1 9 sp IDSP sp data 2 cr IN1 Input 1 Type sp IN1 cr 1 J t c 32 to 1500 F 0 to 816 C 47 sp IN1 sp data 2 cr 2 K t c 3...

Страница 51: ...detect 32 Event input 2 off 33 Event input 2 on INPT Lockout Input Menu sp INPT cr 0 No input menu lockout 116 sp INPT sp data 2 cr 1 Read only 2 No read or write allowed Default 0 IT1A Integral for...

Страница 52: ...112 sp LOC sp data 2 cr 1 Lock out mode key 2 Lock out mode and auto manual keys 3 Lock out all single keys Default 0 LOP Low Power Limit sp LOP cr 100 to HIP 107 sp LOP sp data 2 cr Default 100 Heat...

Страница 53: ...data 2 cr if DFL 1 then 0 0 to 99 9 of span Default 25 F 14 C 25 units or 3 0 PB1B Proportional Band sp PB1B cr if DFL 0 then 0 to 9999 34 Output 1 PID Set B sp PB1B sp data 2 cr if DFL 1 then 0 0 to...

Страница 54: ...ate Output 2 sp RA2B cr 0 00 to 9 99 minutes 42 PID Set B sp RA2B sp data 2 cr Default 0 00 RE1A Reset Output 1 sp RE1A cr if ALGO 0 1 or 3 then 22 PID Set A sp RE1A sp data 2 cr 0 00 to 9 99 repeats...

Страница 55: ...larm 2 Silence sp SIL2 cr 0 off disabled 77 sp SIL2 sp data 2 cr 1 on enabled Default 0 SIL3 Alarm 3 Silence sp SIL3 cr 0 off disabled 83 sp SIL3 sp data 2 cr 1 on enabled Default 0 SRNB Serial Number...

Страница 56: ...Set Point Value sp STPT cr RL1 to RH1 103 PID A B Switch sp STPT sp data 2 cr Default Sensor type low range SYS Lockout System sp SYS cr 0 No lockout 113 Menu sp SYS sp data 2 cr 1 Read only 2 No read...

Страница 57: ...2 LOC 40114 113 LOCK SYS 40115 114 LOCK PIDA 40116 115 LOCK PIDB 40117 116 LOCK INPT 40118 117 LOCK OTPT 40119 118 LOCK GLBL 40120 119 LOCK COM 40121 120 LOCK DIAG 40122 121 LOCK CAL 40123 122 DATE 40...

Страница 58: ...ith the Watlow Series 988 Family Temperature process Controller Prompt Table 986 987 988 989 Name Description Read and or Write Syntax Range data 1 data 2 Modbus address 6 14 Command Summary Series 98...

Страница 59: ...rder The user s manual has more information about prompt interaction Complete Parameter Download Sequence IN1 IN2 RTD1 RTD2 DFL CF OT1A OT2A OT1B OT2B OT3 DEC1 RL1 RH1 CAL1 FTR1 DEC2 RL2 RH2 CAL2 FTR2...

Страница 60: ...LT Altitude sp ALT cr 0 0 1902 Compensation sp ALT sp data 2 cr 1 2500 feet 2 5000 feet default 0 AMB Ambient Terminal sp AMB cr Input 1 terminals in 0 0 F 1500 Temperature ANUN Alarm Annunciation sp...

Страница 61: ...Loop sp CF sp data 2 cr 1 Display C Default 0 COM Lockout Comms sp COM cr 0 No lockout 1312 Menu sp COM sp data 2 cr 1 Read only 2 No read or write Default 0 CT1A Cycle Time sp CT1A cr S S relay or op...

Страница 62: ...0 00 3 Decimal point 0 000 Default 0 DEC2 Decimal Point sp DEC2 cr 0 Decimal point 0 616 Process Input 2 sp DEC2 sp data 2 cr 1 Decimal point 0 0 2 Decimal point 0 00 3 Decimal point 0 000 Default 0 D...

Страница 63: ...sp FTR1 sp data 2 cr Default 0 FTR2 Process Input 2 sp FTR2 cr 60 to 60 seconds 614 Filter Time Constant sp FTR2 sp data 2 cr Default 0 GLBL Lockout sp GLBL cr 0 No lockout 1311 Global Menu sp GLBL sp...

Страница 64: ...sp IN2 sp data 2 cr 1 J t c 32 to 1500 F 0 to 816 C Caution Writing to 2 K t c 328 to 2500 F 200 to 1371 C IN2 resets most 3 T t c 328 to 750 F 200 to 399 C prompts to their 4 N t c 32 to 2372 F 0 to...

Страница 65: ...Alarm 3 Latching sp LAT3 cr 0 Latching alarms 738 sp LAT3 sp data 2 cr 1 Non latching alarms Default 1 LIN2 Linearization sp LIN2 cr 0 None 618 Process Input 2 sp LIN2 sp data 2 cr 1 Wet bulb 2 Vaisa...

Страница 66: ...ocess 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 PB1B Proportional Band sp PB1B cr if DFL 0 and CF 1 then 0 to 555 C 520 Output 1 PID sp PB1B sp data...

Страница 67: ...9 99 minutes 534 PID Channel B sp RA2B sp data 2 cr Default 0 00 RE1A Reset Output 1 sp RE1A cr 0 00 to 9 99 repeats minute 502 PID Channel A sp RE1A sp data 2 cr Default 0 10 repeats minute RE1B Rese...

Страница 68: ...nit serial number in two segments SNxx and xxxx i e as in the upper and lower front panel displays SRNT Serial Number sp SRNT cr SNxx 1 Top Display 00 to 99 SOFT Software Revision sp SOFT cr 0 Rev A 7...

Страница 69: ...ecimal places returned by many of these com mands is deter mined by the DEC1 DEC2 IN1 or IN2 setting CAUTION Avoid writing continuously such as ramping set points or repetitive loops to the Series 996...

Страница 70: ...738 LAT3 40740 739 SIL3 40743 742 ANUN 40736 735 PRC3 40744 743 AOUT 40745 744 ARL 40746 745 ARH 40747 746 ACAL 40901 900 DFL 40902 901 C F 40903 902 FAIL 41061 1060 EI1 41101 1100 RPA 41102 1101 RTA...

Страница 71: ...syntax error See the ER2 error code list in Chapters 5 6 and 7 With XON XOFF protocol and the RS 232 interface the Series 981 984 986 989 and 996 999 sends no feedback on commands Therefore you may w...

Страница 72: ...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 6...

Страница 73: ...n Output 1 981 984 OT1 5 8 986 989 OT1 6 13 996 999 OT1A OT1B 7 7 Output 2 981 984 OT2 5 8 986 989 OT2 6 13 996 999 OT2A OT2B 7 7 address prompt 3 1 4 4 Addr 3 2 Alarm Annunciation ANUN 981 984 5 4 98...

Страница 74: ...tput 2 OTY2 981 984 5 9 986 989 6 14 996 999 7 8 Output 3 OTY3 981 984 5 9 986 989 6 14 996 999 7 8 Output 4 OTY4 981 984 5 9 986 989 6 14 996 999 7 8 hex string 4 2 hexadecimal hex 1 4 High Power Lim...

Страница 75: ...Output 1 Action 981 984 OT1 5 8 986 989 OT1 6 13 996 999 OT1A OT1B 7 7 Derivative PID 981 984 DE1 5 4 986 989 DE1A DE1B 6 9 996 999 DE1A DE1B 7 4 Hardware Type OTY1 981 984 5 9 986 989 6 14 996 999 7...

Страница 76: ...996 999 RTA RTB 7 10 Ramping Initiation 986 989 RP 6 16 996 999 RPA RPB 7 10 Range High Input 1 RH1 981 984 5 10 986 989 6 15 996 999 7 9 Input 2 RH2 981 984 5 10 986 989 6 15 996 999 7 9 Retransmit A...

Страница 77: ...5 4 1 Syntax Query MTR 5 12 System Menu Lockout SYS 986 989 6 17 996 999 7 11 T termination resistors 2 3 2 4 Test Outputs TOUT 981 984 5 11 986 989 6 17 996 999 7 11 total characters 4 1 Type Input...

Страница 78: ...A 8 Data Communications with the Watlow Series 988 Family Appendix Notes...

Страница 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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