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16. RS-232C SERIAL INTERFACE / EXTERNAL INPUT
RS-232C
The balance is a DCE device. Connect the balance to a personal computer (DTE), using a straight
through cable or a modem cable.
Transmission system : EIA RS-232C
Transmission form : Asynchronous, bi-directional, half duplex
Data format : Baud rate : 600, 1200, 2400, 4800, 9600 bps
Data bits : 7 or 8 bits
Parity : Even, Odd (Data bits 7 bits)
None (Data bits 8 bits)
Stop bit : 1 bit
Code : ASCII
Pin connections
Pin No. Signal name Direction Description
1 FG - Frame ground
2 RXD Input Receive data
3 TXD Output Transmit data
4 RTS Input Ready to send
5 CTS Output Clear to send
6 DSR Output Data set ready
7 SG - Signal ground
18 PRINT Input Same as the PRINT key
19 RE-ZERO Input Same as the RE-ZERO key
8 – 25 (Excluding 18 and
19)
- - Not connected
Note
The signal names for the RS-232C are the same as those for the DTE side except TXD and
RXD.
Circuits
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