A&D Weighing HW-1200KGV3 - Manual (Page 70)

Page 68 HV-G/HW-G Series 17. Options
17.3. RS-422/ RS-485 / Relay Output (OP-04)
Replacing with the standard RS-232C interface, 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 continuously.
Command mode Controls the scale using commands from a computer.
To use the RS-422/ RS-485 interface, set the parameters of the "Baud rate ( f4 )",
“Address ( f11 )", "Output mode ( f5 )" and " Format ( f15 )" in the function table.
Transmission system EIA 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: 0Dh, LF: 0Ah)
Address 01 to 99 Address parameter ( f11 ) of function table.
Relay Solid-state-relay
Maximum voltage 50V DC
Maximum current 100mA DC
Maximum resistance 8 Ω
Adaptable connector TM:BLA9 (of accessory)
Pin connections
Pin No. Signal name Direction Description A
1 SDA Output RS-422/485 transmission A terminal A
2 SDB Output RS-422/485 transmission B terminal A
3 RDA Input RS-422/485 receive A terminal A
4 RDB Input RS-422/485 receive B terminal A
5 TRM - 120 Ω terminator A
6 HI Output Relay output of HI A
7 OK Output Relay output of OK A
8 LO Output Relay output of LO A
9 COM - Relay common terminal A