– 155 –
APPENDIX
B-1. 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
When Memory Switch 4-D = 0: Same as DTR signal
When Memory Switch 4-D = 1: Always SPACE
5 N.C. Not connected
6DSRIN• DIP Switch 2-7 = 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
In DTR/DSR communication mode when Memory Switch 4-5=1,
status of this signal is not checked.
This signal is not checked in the X-ON/X-OFF communication
mode.
• DIP Switch 2-7 = 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
20 DTR OUT Indicates whether data receive from host is enabled or disabled.
DTR/DSR Communication Mode
Space when receive is enabled.
Appendix B: Serial Interface
Printer status
Memory switch 1-7
01
1. During the period from when the power is
turned on (including resetting using the in-
terface) to when the printer is ready to re-
ceive data.
2. During self printing and dot alignment ad-
justment.
3. During paper feeling using the paper feed
button (ESC/POS mode only).
4. When the printer stops printing due to a
paper end or a paper near end.
5. When an error has occurred.
6. When the receive buffer becomes full.
BUSY BUSY
BUSY BUSY
BUSY —
BUSY —
BUSY —
BUSY BUSY
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