12
AUTOM ATI C TR A N S FE R SWITCH , OTM _C _ 21D
OTM_C21D can achieve communication function
by using the optional external Modbus RTU
module.
—
3.5 Modbus communication function
Figure 10. Modbus RTU communication module
3.5.1 Modbus parameters
Parameter
Value
Modbus Address
1…32 (Default 1)
Modbus Baud Rate
4800bps
9600bps (Default)
19200bps
38400bps
Modbus Stop Bits
1 Stop Bit (Default)
2 Stop Bits
Modbus Parity
None
Odd
Even (Default)
Local/Remote
Local monitoring mode (Default)
Remote control mode
Table 2. Modbus parameters of OTM_C21D
3.5.2 Modbus functional code
Function code
Name
03(0x03)
Read Holding Registers
04(0x04)
Read Input Registers
06(0x06)
Write Single Register
16(0x10)
Write Multiple Registers
17(0x11)
Report Slave ID
Table 3. Modbus functional code
