113
A-4. Specifications of Connectors
RS-232C Connector KEY Connector
(When used for checkweighing output)
Pin
No.
Name Function
1 FG Frame ground
2
TXD Data output
3
RXD Data input
4
RTS Internal connection with CTS
5
CTS Internal connection with RTS
6
DSR Handshake (receiving)
7
SG Signal grounding
8
NC Blank
9
NC Blank
10
NC Blank
11
NC Blank
12
NC Blank
13
NC Blank
14
NC Blank
15
NC Blank
16
NC Blank
17
NC Blank
18
NC Blank
19
NC Blank
20
DTR Handshake (transmission)
21
NC Blank
22
NC Blank
23
NC Blank
24
NC Blank
25
NC Blank
Pin
No.
Name Function Remark s
1GND
Ground of
checkweighing
2 OPERA-
TION
Output during
weighing
Checkweighing output
is O.C. (open collec-
tor).
Capacity:
5 to 24VDC,
0 to 20mADC
3 STABIL-
ITY
Output while
balance display is
stable.
10 LO
LO signal output
11 GO
GO signal output
12 HIGH
HI signal output
13 ZERO
Output while
balance display is
zero
9
Pin 9 and Pin 15 must be short-circuited by the
external device in order to use KEY Connector
for checkweighing signal output.
15
"Pin n" O.C. (+)
"Pin 1" (GND)
Balance internal circuit
Concept of Open Collector Circuit
(n= 2,3,10,11,12,13)