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1 WATLOW Series 945 How to Use Data Communications User's Manual $5.00 Made in the U.S.A. Printed on Recycled Paper W945-SA50-9210 March, 1992 Supersedes: W945-SA40-9119 Ho w T o Use Data Comm unications with the W atlo w Series 945 Watlow Controls, 1241 Bundy Blvd.
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 Inte.
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 with the data communications option. Use in conjunction with the Series 945 User's Manual. This is expert user-level material and requires previous experience with data communications.
How to Use Data Communications 4 WATLOW Series 945 19 20 21 22 23 T + T - R + R - Signal Common (Optional) Series 945 # 1 Series 945 #1 0 Twisted Pair Wire 1 2 3 4 5 9 8 7 6 19 20 21 22 23 T + T - R +.
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.
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 only two lines, both lines used for transmitting and receiving. Only one device, the computer or the control, can be speaking at a time.
7 WATLOW Series 945 How to Use Data Communications Control Chassis - Top View Configuration (Up) RS-423 A (Down) RS-422 A (Up) RS-423A (Down) RS-422A Figure 4 - RS-422A/RS-423A Switch Selection. NOTE: The Series 945 leaves the factory in RS-423A operation (C1).
How to Use Data Communications 8 WATLOW Series 945 P arameters Setup Menu - Comm unications P arameters Enter the Setup menu by pressing the UP/DOWN keys simultaneously for 3 seconds. The lower display shows the LOC parameter, and the upper display shows its current level.
9 WATLOW Series 945 How to Use Data Communications Minutes: Represents the 24 hour time-of-day clock setting for minutes. Appears if Prot = On and Log = tAbL, CHrt or SPCA, SPCd, SPCn. Parameter resets to default after a power interruption. Range: 0 to 59 Default: 0 Interval: Selects the time interval for the logging function.
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.
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. All commands do not require the full number of data fields. Command <Space> Data.1 <Space> Data.
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 a description, rather than literal characters.
13 WATLOW Series 945 How to Use Data Communications XON/XOFF "=" Figure 6 - XON/XOFF "=" Command Example. ASCII Characters HEX Value 1 Space 5 0 0 41 4C 31 20 35 30 30 <Space>.
How to Use Data Communications 14 WATLOW Series 945 Figure 7 - XON/XOFF "?" Command Example. XON/XOFF "?" XON/XOFF "?" Command Example You want to know the Alarm 1 Low (A1LO) value. The "?" uses a variation of the message syntax shown just below.
15 WATLOW Series 945 How to Use Data Communications ANSI X3.28 Table 4 - Address to ASCII Conversion. 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.
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 general command syntax applies to all commands.
17 WATLOW Series 945 How to Use Data Communications ANSI X3.28 "?" Figure 9 - ANSI X3.28 "?" Command Example. ANSI X3.28 "?" Command Example You need to know the Alarm 1 Low value (A1LO). The "?" uses a variation of the message syntax shown just below.
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 Multiple modes are possible.
How to Use Data Communications 19 WATLOW Series 945 Commands Data.1 Data.2 Low Limit High Limit Code Function AXHI Process RL value RH value Alarm High X value ± 555/Deviation ± 999 A XLO Process RL.
20 WATLOW Series 945 How to Use Data Communications Commands Data.1 Data.2 Low Limit High Limit Code Function LAT X 0 1 0 Latched alarms 1 Non-latched alarms LINE 10 127 Lines per page for data logging LOC 0 3 Lock front panel LOG 0 3 0 Logging OFF See Page 22.
How to Use Data Communications 21 WATLOW Series 945 Data Logging Figure 10 - Data Logging Interface Wiring Example. 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.
22 WATLOW Series 945 How to Use Data Communications Data Logging Figure 11 - Table Printout Example. SPC - Statistical Pr ocess Contr ol SPC tracks variability to help you distinguish between natural variability (common causes) from unnatural variability (special causes).
How to Use Data Communications 23 WATLOW Series 945 SPC The Difference Between Contr ol & 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 the actual performance of the process.
24 WATLOW Series 945 How to Use Data Communications Char t & SPC NOTE: The time is printed every 5th interval (Int). The tempera- ture variable (*) is printed every 10th interval. One Int = 6 seconds. Figure 12 - Chart and SPC Printout Example 100 ° F 125 75 PROCESS DATE: 01-01-90 * * * * * * CPKL = 1.
How to Use Data Communications 25 WATLOW Series 945 Error Codes Table 7 - Printer Troubleshooting. 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.
26 WATLOW Series 945 How to Use Data Communications Inde x A ALM, 20 ANSI X3.28 "=" Command, Fig. 8, 17 ANSI X3.28 "?" Command, Fig.
How to Use Data Communications 27 WATLOW Series 945 Notes.
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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