A&D Weighing HR-202i - Manual (Page 43)

41
13. Standard Input and Output Interface
13.1.
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, 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 25-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.
Start bit
Data bits
Parity bit
Stop bit
-5V to -15V
+5V to +15V
RS-232C
#4-40 UNC
Balance side
DCE
Computer side
DTE
Inside of balance Terminal example
+5V
3.3k Ω
TXD 2
RXD 3
RTS 7
CTS 8
DSR 6
SG 5
RXD
TXD
RTS
CTS
DSR
SG