RS485/MODBUS Protocol E-3MN762
E.6 Communication Specifications
Table E-4 Communication Specifications
Communication Speed 9600, 19200, 38400, 57600, 115200 bps selectable
Control Procedure Asynchronous communication system
Communication Half Duplex
Characters (Data bits) ASCII (8 bit)
Start bits 1 bits
Stop bits 1 bits
Check Sum 2 byte CRC
Parity None
E.7 Communications Protocol (MODBUS-RTU)
Use MODBUS-RTU protocol (Open Protocol). Requires computer or other host to be network Master and inverters to be
Slaves. Inverters respond to Read/Write commands from the Master.
Table E-5 Modbus-RTU Protocol
Register Upper byte Lower Byte Command Type
1* Command 03,06 R/W
2* Speed reference 03,06 R/W
3* Reserved 03,06 R/W
4* Modbus ramp control time 03,06 R/W
5 Reserved 03 R
6* Error code Drive status 03 R
7* Motor speed 03 R
8* Motor current 03 R
9* Reserved 03 R
10 Reserved 03 R
11 Digital input status 03 R
12 Rating ID 03 R
13 Power rating 03 R
14 Voltage rating 03 R
15 IO processor software version 03 R
16 Motor control processor software version 03 R
17 Drive type 03 R
18 Reserved 03 R
19 Reserved 03 R
20 Analog 1 input result 03 R
21 Analog 2 input result 03 R
22 Speed reference value 03 R
23 DC bus voltages 03 R
24 Drive temperature 03 R
25 to 30 Reserved 03 R
*Registers are available in standard eld bus gateway conguration.
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