Appendix B: Serial Interface; B-1. Pins And Signal Names - Star Micronics SP500 Series User Manual

B-1. Pins and Signal Names

Pin No. Signal Name
1 FG
2 TXD
3 RXD
4 RTS
5 N.C.
6 DSR
7 SG
8 -19 N.C.
20 DTR

Appendix B: Serial Interface

Direction
— Frame ground
OUT Transmission data
IN Receive data
OUT Always space
Not connected
IN 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.
Signal ground
Not connected
OUT Indicates whether data receive from host is enabled or disabled.
DTR/DSR Communication Mode
Space when receive is enabled.
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. When the printer stops printing due to a
paper end or a paper near end.
4. When an error has occurred.
5. When the receive buffer becomes full.
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Function
Printer status
Memory switch 6-9
0 1
BUSY BUSY
BUSY BUSY
BUSY —
BUSY —
BUSY BUSY