GX-A Series/GF-A Series Communication Manual 4 / 41
Connector: D-Sub9-pin
（
male
）
Method of transmission: EIA RS-232C
Format of transmission: Asynchronous, two-way, half-duplex transmission
Data transmission rate: 5 times per second
（
ca. 5.21Hz
）
, 10times per second
（
ca. 10.42Hz
）、
20 times per second
（
ca. 20.83Hz
）
Linked with the setting value of the internal setting’s display rewrite cycle
Signal format
Baud rate
600, 1200, 2400, 4800, 9600, 19200, 38400 bps
Data bits
7 or 8 bits
Parity
EVEN
、
ODD
（
Data length
7 bits
）
NONE
（
Data length
8 bits
）
Stop
bits 1
bit
Code
ASCII
Format
of
1
character
D-Sub9, pin arrangement
Pin No.
Signal
name
Direction Meaning,
remarks
1
-
-
N.C. (same potential
with SG)
2 RXD
Output
Transmitted
data
3 TXD
Input
Received
data
4 - -
N.C.
5 SG -
Signal
ground
6
DSR
Output Data Set Ready
7
RTS
Input
Request to Send
8
CTS
Output Clear to Send
9
-
Output N.C. (12V Output)
Connection diagram
（
when connecting to a PC
）
2. Interface specifications
2-1. RS-232C
0 1 2
LSB
3
5
4
6
P
MSB
Sp
St
Start bit
Data bits
Parity bit
Stop bit
0 +5V ~ +15V
1 -5V ~ -15V
Balance
（
DCE
）
RXD
TXD
RTS
CTS
DSR
SG
PC
（
DTE
）
RXD
TXD
RTS
CTS
DSR
SG
Inch screw #4-40UNC
1
2
3
4
5
6
7
8
9
