Oki Pos 407II - Manual (Page 58)

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13-2. RS-232C Connector
Pin No. Signal name Direction Function
 F-GND — Frame ground
 TXD OUT Transmission data
 RXD IN Receive data
 RTS OUT Same as DTR signal.
 N/C Not used
6 DSR IN 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 com-
munication mode.
 S-GND — Signal ground
~ N/C Not used
0 DTR OUT 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 condi-
tions:
• Period between reset and communication ena-
bled
• During self printing
ESC/POS Mode
Indicates whether data receive from host is enabled or
disabled.