Honeywell UDC2800 - Page 329

Shed
The computer setpoint override will continue until SHED from
communications occurs or the controller is placed into monitor mode
through communications. Doing periodic SLAVE READS within the
shed time will allow the override to continue until communication is
stopped and shed time elapses. Does not apply to Bluetooth
communications.
ATTENTION: 0 Shed (code 8D4 (Hex)) allows the override to
continue indefinitely or until the reset shed timer register
address 1B90 is written using function code 6 or register
address 199 (Hex) using function code 21. Any data value can
be written because it is ignored.
When SP is overridden, the middle display shows the CSP value as
CSP XXXX.
Table 11-13: Shed Timer Reset
Parameter
Description
Register Address
Data
Type
Access
Data Range or Enumerated
Selection
Hex Decimal
Shed Time Reset 199 409 FP W Exit Slave Mode
Associated Parameters
Refer to table below for the codes to display or change any of the
parameters associated with the computer setpoint.
Parameter
Register Address
Hex Decimal
Setpoint Limits E5, E6 229, 230
Local Setpoint #1 123 291
Local Setpoint #2 124 292
Local Setpoint #3 125 293
Local Setpoint #4 126 294
Local Setpoint Selection 8A5 2213
Computer Setpoint Ratio 105 261
329
Chapter 11 - Modbus RTU Function Codes 20&21