Thermo Scientific 42i Instruction Manual page 338

MODBUS Protocol
MODBUS Parameters Supported
Reading a Write Coil
C-14 Model 42i Instruction Manual
Coil Number Action Triggered
114 NOT USED
115 NOT USED
116 NOT USED
117 EXT ALARM 1
118 EXT ALARM 2
119 EXT ALARM 3
120 NOT USED
To read a write coil, issue a read coil command for that coil. For example,
to view the state of write coil 101, issue a "read coil 101".
Coil Group
Thermo Fisher Scientific