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Preferred JC-22D2 - Modbus

Preferred JC-22D2
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SDI-JC-22D2 rev. 11-1-21 page 19 of 22
Modbus
RS485 Baud: 4800, 9600, 19200, 38400, 57600
RS485 Parity: Odd, Even, None
Ethernet: 10/100 Mb/s
Protocol: RTU
Address: 1-247
Register Formats: 16 bit Signed Integer and 32 bit Floating Point
Modbus Commands: 01 Read Coils, 03 Read Registers, 05 Write Single Coil, 06 Write Single Register,
16 Write Multiple Registers (2 registers max)
Max Poll Size: 120 coils or registers (except Code 16)
Coil
0 =
1 =
Description
98
WO
Alarm Silence
Remote Alarm Silence
99
RO
No Alarm
Alarm
Common Alarm
120
RO
No Alarm
Alarm
High Draft Alarm
121
R
O
Auto
Manual
Auto/Manual
1
22
RO
Fan OFF
Fan ON
Fan Energized Input
123
RO
De
-
Energized
Energized
Fuel Valve Energized Input
124
RO
Limits OFF
Limits ON
Start Limits Input
125
RO
De
-
Energized
Energized
Burner Start Delay Relay
Register
Type
Description
40
200
RO
F
LOAT
Filtered Draft PV
40202
R
O
F
LOAT
Draft Control Setpoint
40204
R
O
F
LOAT
Actuator Position Command

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