Appendix
87
A-4. Specifications of the RS-232C Connector
Pin number
Use
Name
Function
Remarks
1
RS
FG
Frame ground
2
RS
TXD
Data output
3
RS
RXD
Data input
4
RS
RTS
Internal connection with CTS
5
RS
CTS
Internal connection with RTS
6
RS
DSR
Handshake (receiving)
7
RS
SG
Signal grounding
8
NC
NC
Blank
9
Foot switch
TARE
External TARE
To GND
10
NC
NC
Blank
11
NC
NC
Blank
12
NC
NC
Blank
13
Spare
EXT
Extension input
Connection is prohibited
14
NC
NC
Blank
15
NC
NC
Blank
16
NC
NC
Blank
17
NC
NC
Blank
18
NC
NC
Blank
19
NC
NC
Blank
20
RS
DTR
Handshake (transmission)
21
NC
NC
Blank
22
NC
NC
Blank
23
NC
NC
Blank
24
NC
NC
Blank
25
Foot switch
External PRINT
To GND