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Page 74 AD-4402
8.2.
8.2.8.2.
8.2. Built-in RS-485 Interface
Built-in RS-485 InterfaceBuilt-in RS-485 Interface
Built-in RS-485 Interface
The RS-485 interface can use command to control the indicator. The interface can
read weighing data or parameters or store parameter to the indicator.
The interface can connect max. 32 units and a personal computer in a communication
cable.
These unit is specified by address appended to the command.
Transmission system EIA RS-485, Asynchronous, bi-directional, half-duplex
Data length 7 bis ot 8 bits
Start bit 1 bit
Parity bit Odd, Even, not used
Stop bits 1 bit, 2 bits
Baud rate 600 bps, 12000 bps, 2400 bps, 4800 bps, 9600 bps, 19200
bps, 38400 bps
Line 2 wires (2-balanced wires)
Connection Max. 32 units
Character code ASCII code
Terminator CR, CR LF
The way of Use and Note
When use terminator, connect between SDA and SDB terminals with accessory
resister.
If there is not signal ground at host computer, it is not necessry to use the SG
terminal.
If the shield cable is used, connect the FG teminal to shield line.
When connecting to RS-232C, Use AD-7491 or converter of RS-232C/ RS-485 on
market.
Use multi-droped connection for command mode.
Do not use multi-droped connection in stream mode or jet stream mode.
8.2.1.
8.2.1.8.2.1.
8.2.1. Connection
ConnectionConnection
Connection
Terminals Interface Circuit
SDA
RS-485
A
B
SG
C.LOOP
FG
SDB
SG
Shield
A
D-4402 Inside
A
B
SG
RE/DE