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13-2.RS-232C Connector
Pin No.
1
2
3
4
5
6
Signal name
F-GND
TXD
RXD
RTS
N/C
DSR
Direction
—
OUT
IN
OUT
7
8~19
20
S-GND
N/C
DTR
—
IN
OUT
Function
Frame ground
Transmission data
Receive data
Same as DTR signal.
Not used
STAR Mode
Status of this signal is not checked.
ESC/POS Mode
In DTR/DSR communication mode, indicates whether
data receive from host is enabled or disabled.
Space: Receive enabled
Mark: Receive disabled
(except when transmitting data by DLE EOT, and GS a)
This signal is not checked in the X-ON/X-OFF communication mode.
Signal ground
Not used
STAR Mode
Indicates whether data receive from host is enabled or
disabled.
1) DTR/DSR 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
ESC/POS Mode
Indicates whether data receive from host is enabled or
disabled.
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