A&D HV-G Series instruction manual 17.2 RS-422 / RS-485 / Relay output OP-04

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

HV-G Instruction Manual Page 57