27
Pin assignments
Pin No.
Signal name
Direction
DCE-DTE
Description
1 – –
N.C.
2 TxD
→
Transmit
data
3 RxD
←
Receive
data
4 – –
N.C.
5 GND –
Signal
ground
6 DSR
→
Data set ready
7 RTS
←
Request to send
8 CTS
→
Clear to send
9 – –
Used
internally
Signal names of the scale side are the same as the
DTE side with TxD and RxD reversed
.
Scale (DCE)
External device (DTE)
Inside the scale
Terminal example
RxD
TxD
RTS
CTS
DSR
GND
TxD 2
RxD 3
RTS 7
CTS 8
DSR 6
GND 5