Modbus Read, Write and Override Parameters plus Exception Codes
3/07 UDC3500 Universal Digital Controller Product Manual 421
10.7.20 Communications
Table 10-29 lists all the register addresses and ranges or selections for the function
parameters in Set-up Group Communications.
Table 10-29 Set-up Group – Communications
Parameter
Register
Address
Data
Type
Access Data Range or
Enumerated Selection
Description ID Hex Decimal
Shed Time 79 004F 79 INT R/W 0 = No Shed
1 = 255 sample periods
Shed Mode and
Output
162 00A2 162 INT R/W 0 = Last Mode and Last
Output
1 = Manual Mode, Last
Output
2 = Manual Mode, Failsafe
Output
3 = Automatic Mode
Shed Setpoint
Recall
163
00A3 163 INT R/W 0 = To Last Local Setpoint
used
1 = CSP
Computer Setpoint
Ratio
90
005A 90 FP R/W –20.00 to 20.00
Computer Setpoint
Bias
91
005B 91 FP R/W –999 to 9999.
Loop2 Computer
Setpoint Ratio
90 015A 346 FP R/W –20.00 to 20.00
Loop2 Computer
Setpoint Bias
91 015B 347 FP R/W –999 to 9999.
Communication
Address
77
004D 77 FP R/W 1 - 99
Communications
Type
231 00E7 231 INT R/W 0 = None
1 = Disable
2 = RS-485 Modbus
3 = Ethernet only if installed
IR Port Enable 241 00F1 241 INT R/W 0 = Disable
1 = Enable
Baud Rate 232 00E8 232 INT R/W 0 = 4800
1 = 9600
2 = 19200
3 = 38400
Transmit Delay 78 004E 78 FP R/W Response Delay in ms
(1 to 500) +6ms
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