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7. Specifications
7.1 Type of Communication Standard: EIA Standard Based on RS-485
7.2 Communication Specifications
7.2.1 Communication Method
: Network･････Multidrop System (1 to 31 stations)
: Direction of Information･･･････Half-Duplex
: Synchronization System･･･････Start-Stop Synchronization
: Transmission Code･･･････ASCII 7-bit Code (except for BCC data)
(For 8-bit code, top bit = 0)
7.2.2 Interface System
: Signal Wire･･･････････Two wires for sending and receiving
: Communication Speed･････････1200, 2400, 4800, 9600, 19200BPS
Select and set the above.
: Communication Distance･････････Up to 500m
However, the distance may vary depending on the surrounding
environment, such as cable.
7.2.3 Character
1) TOHO Communication Protocol
: Start Bit Length･･･････1 bit fixed
: Stop Bit Length: Select and set from 1 bit and 2 bits
: Data Length: Select and set from 7 bits and 8 bits
: Parity･･･････････････Select and set from none, odd, and even
: BCC Checking･････････Select and set from Yes (with) and No (without)
: Communication Address･･･････････1-99
2) MODBUS (RTU) Communication Protocol
: Start Bit Length･･･････1 bit fixed
: Stop Bit Length: Select and set from 1 bit and 2 bits (With parity: 1 bit fixed)
: Data Length･･･････････････8 bits fixed
: Parity･･･････････････Select and set from none, odd, and even
: CRC-16 Check･･･ON fixed
: Communication Address･･･････････1-247
3) MODBUS (ASCII) Communication Protocol
: Start Bit Length･･･････1 bit fixed
: Stop Bit Length: Select and set from 1 bit and 2 bits (With parity: 1 bit fixed)
: Data Length･･･････････････7 bits fixed
: Parity･･･････････････Select and set from none, odd, and even
: LRC Check･････････ ON fixed
: Communication Address･･･････････1-247
4) MODBUS (RTU/ASCII) Communication Function Code
: 03H (Read the content of the holding register)
: 10H (Write the content of multiple holding registers)
