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11-1-2. Connectors and Signal Names
RS-232
Pin No.
Signal name
Direction
Function
–
FG
—
Frame ground
1
N.C
—
Not used
2
RXD
IN
Receiving data
3
TXD
OUT
Transmission data
4
DTR
OUT
Indicates whether data receive from host is enabled or disabled.
1) DTR Communication Mode
Space when receive is enabled.
2) X-On/X-Off Communication Mode
Always space, except during following conditions:
• Period between reset and communication enabled
• During self printing
5
S-GND
—
Signal ground
6
DSR
IN
Status of this signal is not checked
7
RTS
OUT
Always space
8
CTS
IN
Status of this signal is not checked
9
N.C
—
Not used
D-sub 9 Pin