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Serial interface pins and signal names
Pins and Signal Names
Pin
No.
Signal
Name
Direction Function
1 FG — Frame ground
2 TXD OUT Transmission data
3 RXD IN Receive data
4 RTS OUT
STAR Mode
When Memory Switch 4-D = 0: Same as DTR signal
When Memory Switch 4-D = 1: Always SPACE
ESC/POS Mode
Same as DTR signal
5 N.C. Not connected
6 DSR IN • DIP Switch 9 = OFF
STAR Mode
Status of this signal is not checked.
ESC/POS Mode
In DTR/DSR communication mode when Memory Switch4-5 = 0, indicates whether data
receive from host is enabled or disabled.
Space: Receive enabled
Mark: Receive disabled
This signal is not checked in the X-ON/X-OFF communication mode.
• DIP Switch 9 = ON
This signal used for external reset. Printer is reset whenever signal is in mark state with
pulse width of 1mS or more.
7 SG Signal ground
8 -19 N.C. Not connected
13
25
1
14
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