Page 2 - Contents
How to Use Data Communications 2 WATLOW Series 945 Page Item 3 Data Communications and the Series 945 3 Hardware Interfaces Protocols 3 Communications Wiring 4 RS-422A Interface Pinouts 5 RS-423A Interface Pinouts (RS-232C Compatible) 6 EIA-485 Interface Pinouts 6 Connecting the Control and Computer...
Page 3 - Communications Wiring
3 WATLOW Series 945 How to Use Data Communications This manual is a supplement to the Series 945 User's Manual. It is for users withthe data communications option. Use in conjunction with the Series 945 User'sManual. This is expert user-level material and requires previous experience with datacommun...
Page 4 - RS-422A Interface Pinouts
How to Use Data Communications 4 WATLOW Series 945 1920 2122 23 T + T -R + R - Signal Common (Optional) Series 945 #1 Series 945 #10 Twisted Pair Wire 1 2 3 4 5 9 8 7 6 19 2021 22 23 T + T - R +R - Signal Common (Optional) Twisted Pair Wire T + T - R + R - Com Host Computer (rear view) DB-9 female c...
Page 6 - EIA-485 Interface Pinouts; Connecting the Control and the Computer
How to Use Data Communications 6 WATLOW Series 945 EIA-485 Interface Pinouts 945A-XXXX-D000 The EIA-485 communications uses a two wire (half duplex) system. There are onlytwo lines, both lines used for transmitting and receiving. Only one device, thecomputer or the control, can be speaking at a time...
Page 7 - Configuration; How to Set the Hardware Protocol Switches; Network Connections
7 WATLOW Series 945 How to Use Data Communications Control Chassis - Top View Configuration (Up) RS-423A(Down) RS-422A (Up) RS-423A (Down) RS-422A Figure 4 -RS-422A/RS-423ASwitch Selection. NOTE: The Series 945leaves the factory inRS-423A operation (C1). How to Set the Hardware Protocol Switches for...
Page 8 - Parameters; Setup Menu - Communications Parameters
How to Use Data Communications 8 WATLOW Series 945 Parameters Setup Menu - Communications Parameters Enter the Setup menu by pressing the UP/DOWN keys simultaneously for 3seconds. The lower display shows the LOC parameter, and the upper displayshows its current level. All keys are inactive until you...
Page 9 - Setup; Setup Menu
9 WATLOW Series 945 How to Use Data Communications Minutes: Represents the 24 hour time-of-day clock setting for minutes. Appearsif Prot = On and Log = tAbL, CHrt or SPCA, SPCd, SPCn. Parameter resets todefault after a power interruption. Range: 0 to 59 Default: 0 Interval: Selects the time interval...
Page 10 - ASCII Character Set
How to Use Data Communications 10 WATLOW Series 945 ASCII Char. ASCII Ctrl Key Definition Dec. Hex. Char. Equiv. Equiv. Equiv. ENQ Ctrl E Enquiry 5 05 ACK Ctrl F Acknowledge 6 06 NAK Ctrl U Neg. Acknowledge 21 15 STX Ctrl B Start of Text 2 02 ETX Ctrl C End of Text 3 03 EOT Ctrl D End of Transmissio...
Page 11 - Syntax; Message Syntax; Series 945 General Message Syntax
11 WATLOW Series 945 How to Use Data Communications Syntax Message Syntax Messages from your computer to the Series 945 must take this general form. Allcommands do not require the full number of data fields. Command <Space> Data.1 <Space> Data.2 <Space> Data.3... Data.N "Comman...
Page 12 - ASCII; Example Format
How to Use Data Communications 12 WATLOW Series 945 ASCII Example Format For your benefit, we're presenting message/response examples with syntax re-quired for Series 945 communication. Information bracketed by < > indicates adescription, rather than literal characters. We show each ASCII char...
Page 15 - Device Address; Starting Communications in ANSI X3.28 Protocol
15 WATLOW Series 945 How to Use Data Communications ANSI X3.28 Table 4 -Address to ASCIIConversion. Device Address If you are using the ANSI X3.28 Protocol, you must have a device address (identifi-cation) number. A Watlow RS-422A multidrop network can handle up to 10 de-vices with this protocol. EI...
Page 16 - Stopping Communications in ANSI X3.28 Protocol
How to Use Data Communications 16 WATLOW Series 945 ANSI X3.28 "=" Figure 8 -ANSI X3.28 "="Command Example. ANSI X3.28 "=" Command Example The "=" Command sets a specific 945 parameter to a specific value. The generalcommand syntax applies to all commands. The definit...
Page 18 - Commands; Respns
18 WATLOW Series 945 How to Use Data Communications Commands Data.1 Respns Information Comments C1 ACTUAL Actual process value Between R1L and R1H IN 0 J T/C 1 K T/C 2 T T/C 3 N T/C 4 PT2 T/C 5 C T/C 6 Not Used 7 R T/C 8 S T/C 9 B T/C 10 RTD whole 11 RTD tenths 12 0-5V 13 4-20mA MODE 1 Auto mode Mul...
Page 21 - Data Logging
How to Use Data Communications 21 WATLOW Series 945 Data Logging Figure 10 -Data LoggingInterface WiringExample. 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...
Page 22 - SPC - Statistical Process Control
22 WATLOW Series 945 How to Use Data Communications Data Logging Figure 11 -Table PrintoutExample. SPC - Statistical Process Control SPC tracks variability to help you distinguish between natural variability (commoncauses) from unnatural variability (special causes). Based upon measurements,SPC give...
Page 23 - SPC; The Difference Between Control & Specification Limits
How to Use Data Communications 23 WATLOW Series 945 SPC The Difference Between Control & Specification Limits Control limits are established on the control chart at ± 3 standard deviations (3 sigma) . They are based upon the distribution of sample averages and are calculated from theactual perfo...
Page 24 - Chart and SPC Printout
24 WATLOW Series 945 How to Use Data Communications Chart & SPC NOTE: The time is printedevery 5th interval(Int). The tempera-ture variable (*) isprinted every 10thinterval.One Int = 6 seconds. Figure 12 -Chart and SPCPrintout Example 100 ° F 125 75 PROCESS DATE: 01-01-90 * * * * * * CPKL = 1.36...
Page 25 - Error Codes; NAKs and Error Codes
How to Use Data Communications 25 WATLOW Series 945 Error Codes Table 7 -PrinterTroubleshooting. Problem Cause Action Printing all on The line feed Set the printer for a carriage the same line. is missing. return and line feed. The printing is Data formats are Match the Series 945 data garbled. not ...
Page 26 - Index
26 WATLOW Series 945 How to Use Data Communications Index AALM, 20ANSI X3.28 "=" Command, Fig. 8, 17ANSI X3.28 "?" Command, Fig. 9, 18ANSI X3.28 Protocol for RS-422A & EIA-485, 3, 16ASCII Character Set, Table 1, 10ASCII Control Characters (Partial Set), Table 2, 10AXHI, 20AXLO, 2...
Page 27 - Notes
How to Use Data Communications 27 WATLOW Series 945 Notes
