A&D Weighing HW-200KV-WP - Manual (Page 61)

HV-WP/HW-WP Series Page 59 17.3. OP-04, Options
17.3. RS-422/ RS-485 / Relay Output (OP-04)
Replacing the standard 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 continuosly.
Command mode Controls the scale using commands from a computer.
Set the parameters for the "Baud rate ( f4 )", " Output mode ( f5 )", "Address
( f11 )", " Format ( f15 )", in the function table, in advance.
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 ~ 99 Address parameter ( f11 ) of the function table.
Relay Solid-state-relay
Maximum voltage DC50V
Maximum current DC100mA
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