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8.
STANDARD INPUT AND OUTPUT INTERFACE
8.1. RS-232C Interface
The balance is a DCE device. Connect the balance to a personal computer (DTE) using a straight
through cable.
Transmission system
: EIA RS-232C
Transmission form
: Asynchronous, bi-directional, half duplex
Transmission rate
: 10 times/second or 5 times/second (same as data refresh rate)
Data format
: Baud rate : 600, 1200, 2400, 4800, 9600, 19200bps
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 assignments
Pin assignments of the RS-232C communication cable for PC or PLC (D-Sub 9 pin side)
Pin No.
Signal name
Direction
Description
1
-
-
No connection
2 RXD
(TXD)
Output
Transmit
data
3
TXD (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
Pin
names mean one for the DTE side.
#4-40UNC
Start bit
Data bits
Parity bit
Stop bit
-5V to -15V
+5V to +15V
RS-232C
Balance side
DCE
Computer side
DTE
Inside of balance
Terminal example of
the PL or PLC side
+5V
RXD 2
TXD 3
RTS 7
CTS 8
DSR 6
SG 5
RXD
TXD
RTS
CTS
DSR
SG
5 4 3 2 1
9 8 7 6
D-Sub 9 pin plug of RS-232C
cable for the PC or PLC
