Appendix D: Interface - Star SP298 SERIES User Manual

131

Appendix D: Interface

D-1. Serial Interface
Pins and Signal Names
Pin Signal
Direction
No. Name
1 FG —
2 TXD OUT
3 RXD IN
4 RTS OUT
5 N.C.
6 DSR IN
7 SG
8 -19 N.C.
20 DTR OUT
21 - 24 N.C.
Frame ground
Transmission data
Receive data
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
Not connected
• 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.
Signal ground
Not connected
Indicates whether data receive from host is enabled or disabled.
DTR/DSR Communication Mode
Space when receive is enabled.
X-On/X-Off Communication Mode
Always space, except during following conditions:
• Period between reset and communication enabled
• During self-test printing and dot alignment adjustment
Not connected
Function