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HV-G Instruction Manual Page 57
17.2 RS-422 / RS-485 / Relay output (OP-04)
Replacing RS-232C interface with this option, the RS-422/ RS-485 interface can connect
up to 16 scales and control them from a computer.
The RS-422/ RS-485 interface has the following two modes.
Stream mode Outputs data countinuouslly.
Command mode Controls the scale using commands from a computer.
It is necessary to set the parameters of the “Baud rate ( f4 )”, “
Output mode ( f5 )”, “ Format ( f15 )” in the function table in advance.
Transmission systemEIA RS-422/ RS-485
Transmission Asynchronous, bi-directional, half-duplex
Data format Baud rate:2400, 4800, 9600 bps
Data: 7 bits
Parity: 1 bit, Even
Start bit 1 bit
Stop bit 1 bit
Code ASCII
Terminator CR LF (CR: 0D[H], LF: 0A[H])
Address 01 ~ 99 Address parameter ( f10 ) of function table.
Relay Solid-state-relay
Maximum voltage DC50V
Maximum current DC100mA
Maximum resistance 8 Ω
Mating connector TM:BLA9 (of accessory pack)
Pin connections
Pin No. Signal name Direction Description
1 SDA Output RS-422 transmission A terminal
2 SDB Output RS-422 transmission B terminal
3 RDA Input RS-422 receive A terminal
Input / Output RS-485 transmission/ receive A
terminal
4 RDB Input RS-422 receive B terminal
Input / Output RS-485 transmission/ receive B
terminal
5 TRM - 120Ω terminator
6 HI Output Relay output of HI
7 OK Output Relay output of OK
8 LO Output Relay output of LO
9 COM - Relay common terminal