21
2. Pin position
Pin position of the RS-232C cable (D-Sub 9-pin side, female)
Pin No. Signal name Direction
Description
1 (Vs) -
Internally used
*
(Power supply GND terminal for external
equipment)
2 TXD
Output
Transmit data
3 RXD Input
Receive data
4 - -
N.C.
5 SG -
Signal
ground
6 - -
Internally
used
*
7 RTS Input
Request
to
send
8
CTS
Output
Permission to send
9 (Va) -
Internally used
*
(Power supply output terminal for external
equipment
CTS and RTS are internally connected in the balance.
The AD-4212C can communicate by connecting TXD, RXD and SG.
*
When connecting to a PLC such as the external equipment, do not connect to the internally
used signal line.
3. Data output format
- This format consists of fifteen characters excluding the terminator<CR><LF>.
- A header of two characters indicates the balance condition.
- The polarity sign is placed before the data with the leading zeros. If the data is zero, the plus sign is
applied.
Example of output
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
S
T
,
+
0
0
1
2
.
3
4
5
g
When stable
S
T
,
+
0
0
1
2
.
3
4
5
g
When
unstable
U
S
,
+
0
0
0
5
.
4
3
2
g
When over state (plus over)
O
L
,
+
9
9
9
9
9
9
9
E
+
1
9
When over state (minus over)
O
L
,
-
9
9
9
9
9
9
9
E
+
1
9
Header Data
Unit
5 1
9 6
Inch screw
