Rs-232C Serial Interface - A&D FX-200i Instruction Manual

14. RS-232C SERIAL INTERFACE

The balance is a Data Communication Equipment (DCE) device. Connect the balance to a personal
computer (DTE) using a straight through cable.
Transmission system : EIA RS-232C (D-Sub 9-pin, female connector)
Transmission form
Transmission rate
Data format
D-Sub 9-pin assignments
Pin No. Signal name
1 -
2 TXD
3 RXD
4 -
5 SG
6 DSR
7 RTS
8 CTS
9 -
Signal names of the balance side are the same as
the DTE side with TXD and RXD reversed.
Balance side
DCE
Approx.5V
Inside of balance
: Asynchronous, bi-directional, half duplex
: 20 times/second, 10 times/second or 5 times/second (same as data refresh rate)
: Baud rate : 600, 1200, 2400, 4800, 9600, 19200 bps
Data bits : 7 or 8 bits
Parity : Even, Odd
None
Stop bit : 1 bit
Code : ASCII
LSB
0 1
Data bits
Start bit
Direction Description
- No connection
Output Transmit data
Input Receive data
- No connection
- Signal ground
Output Data set ready
Input Request to send
Output Clear to send
- No connection
TXD
2
RXD
3
RTS 7
CTS
8
DSR 6
5
SG
(Data bits 7 bits)
(Data bits 8 bits)
MSB
2 3 4 5 6
Parity bit
#4-40UNC
56
RS-232C
-5V to -15V
1
+5V to +15V
0
Stop bit
9 8 7 6
5 4 3 2 1
Computer side
DTE
RXD
TXD
RTS
CTS
DSR
SG
Terminals sample