Rice Lake FX-i WP Series, A&D Weighing - Manual (Page 57)

55
13. 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 : Asynchronous, bi-directional, half duplex
Transmission rate
: 20 times/second, 10 times/second or 5 times/second (same as data refresh
rate)
Data format
: Baud rate : 600, 1200, 2400, 4800, 9600, 19200 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
D-Sub 9-pin assignments
Pin No. Signal name Direction Description
1 - - No connection
2 TXD Output Transmit data
3 RXD Input Receive data
4 - - No connection
5 SG - Signal ground
6 DSR Output Data set ready
7 RTS Input Request to send
8 CTS Output Clear to send
9 - - No connection
Signal names of the balance side are the same as the DTE side with TXD and RXD reversed.
0 1 2 3 4 5 6
LSB MSB
1
0
-5V to -15V
+5V to +15V
RS-232C
Stop bit
Parity bit Start bit
Data bits
2
3
7
8
6
5
TXD
RXD
RTS
CTS
DSR
SG
RXD
TXD
RTS
CTS
DSR
SG
Approx.5V
Inside of balance
Balance side
DCE
Computer side
DTE
Terminals sample
#4-40UNC
9 8 7 6
5 4 3 2 1