Honeywell UDC2800 Product Manual page 195

Register
Parameter
Address
Description
Hex
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.
When SP is overridden, the middle display shows the CSP value as
CSP XXXX.
Table 11-11: Shed Timer Reset
Parameter
Description
Shed Time Reset
Data
Type
Decimal
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.
Register Address Data
Type
Hex Decimal
199 409 FP
Chapter 11 - Modbus RTU Function Codes
Data Range or Enumerated
Access
Selection
in Engineering Units or Percent.
Data Range or Enumerated
Access
Selection
W Exit Slave Mode
195