나 3 Communication Specification
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3 Communication Specification
Comm. protocol Modbus RTU (16bit CRC)
Connection type RS485
Application standard Compliance with EIA RS485
Max. connection 31 units (address: 1 to 127)
Synchronous method Asynchronous
Comm. type Two-wire half duplex (half duplex)
Comm. distance Max. 800m
Comm. speed 2400, 4800, 9600 (factory default), 19200, 38400bps
Comm. response time 5 to 99ms (factory default: 20ms)
Start bit 1-bit (fixed)
Data bit 8-bit (fixed)
Parity bit None (factory default), Even, Odd
Stop bit 1, 2-bit (factory default: 2bit)
It is recommended to use communication converter RS232C to RS485 (SCM-38I, sold
separately), USB to RS485 (SCM-US48I, sold separately). Communication cable should be
twisted pair cable for RS485 communication.
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