Section 50
00-02-0674
04-16-10
-
25 -
How to Configure a Thermocouple Remote
– ONE CHANNEL
Configuring a Thermocouple Remote is done by programming Configuration Registers 0 -> 6
(CONFIG_0 -> CONFIG_6) which are located at MODBUS register 38 -
> 44 in each Remote‟s
register space.
NOTE:
See
How to Program Remote Configuration Registers
for
additional information on programming the Configuration Registers.
Follow these steps to program the operating parameters:
1. Confirm that the command register is either 0 (zero) or 150. This tells us if a command
is pending.
o
Read register 34 in the Remote‟s register space and confirm that the value is 0
(zero) or 150
o
If the value is not 0 (zero) or 150, then wait until two heartbeats have occurred at
which time the value should be zero.
2. Enable MODBUS writes by sending a value of 4660 to MODBUS address 40053
3. The following configuration values can be set:
o
CONFIG_0 (register 38) Thermocouple Type
Type K
0
Type J
1
o
CONFIG_1 (register 39) Sample Frequency
Default is 15 seconds
Min value is 3 seconds
Max value is 60 seconds
o
CONFIG_2 (register 40) Hysteresis around the absolute min/max temperature.
Default is 5F
Min value is 0F
Max value is 10F
o
CONFIG_3 (register 41) Degrees the TC is allowed to increase since the last
heartbeat before generating an event.
Default is 5F
Min value is 1F
Max value is 100F
o
CONFIG_4 (register 42) Degrees the TC is allowed to decrease since the last
heartbeat before generating an event.
Default is 10F
