Standard Input And Output Interface; Rs-232C Interface - A&D BM series Instruction Manual

16. Standard Input and Output Interface

RS-232C Interface

16.1.
The balance is a DCE device. Connect the balance to a personal computer (DTE) using a straight
through cable.
Transmission system
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
+5V
Inside of balance
: EIA RS-232C
: Asynchronous, bi-directional, half duplex
: 10 times/second or 5 times/second (same as data refresh rate)
: Baud rate : 600, 1200, 2400, 4800, 9600, 19200 bps
Data bits
Parity
Stop bit
Code
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
DCE
TXD 2
RXD 3
RTS 7
CTS 8
DSR 6
SG 5
: 7 or 8 bits
: Even, Odd (Data bits 7 bits)
None (Data bits 8 bits)
: 1 bit
: ASCII
Data bits
RXD
TXD
RTS
CTS
DSR
SG
84
RS-232C
-5V to -15V
+5V to +15V
Stop bit
Parity bit
#4-40UNC
Computer side
DTE
Terminal example
BM series