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Modbus Read, Write and Override Parameters plus Exception Codes
4/07 UDC2500 Universal Digital Controller Product Manual 213
10.7.10 Communications
Table 10-18 lists all the register addresses and ranges or selections for the function
parameters in Set-up Group Communications.
Table 10-18 Set-up Group – Communications
Parameter
Description
Register
Address
Data
Type
Access Data Range or
Enumerated Selection
Hex Decimal
Communication
Address
004D 77 FP R/W 1 - 99
Communications
Type
00E7 231 INT R/W
0 = None
1 = Disable
2 = RS-485 Modbus
3 = Ethernet
IR Port Enable 00F1 241 INT R/W 0 = Disable
1 =- Enable
Baud Rate 00E8 232 INT R/W 0 = 4800
1 = 9600
2 = 19200
3 = 38400
Transmit Delay 004E 78 FP R/W Response Delay in ms
(1 to 500) +6ms
Floating Point
Byte Order
00E9 233 INT R/W 0 = Big Endian
1 = Big Endian Byte Swap
2 = Little Endian
3 = Little Endian Byte Swap
Shed Enable 00EA 234 INT R/W 0 = Enable
1 = Disable
Shed Time 004F 79 INT R/W 0 = No Shed
1 = 255 sample periods
Shed Mode and
Output
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
00A3 163 INT R/W 0 = To Last Local Setpoint used
1 = CSP
Computer
Setpoint Ratio
005A 90 FP R/W –20.00 to 20.00
Computer
Setpoint Bias
005B 91 FP R/W –999 to 9999.
Comm Data
Units
00A1 161 INT R/W
0 = Percent
1 = Engineering Units