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11-1-2. Connectors and Signal NamesRS-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