Star Micronics LC-90 - Manual (Page 118)

AppendixC-E.frame Black #1
109
Appendix C: Interface Pin Outs / Annexe C: Disposition des broches pour interfaces
Anhang C: Interface-Pin-Belegung / Appendice C: Uscite a terminale interfaccia
Optional Serial Interface
Pin Name Function
1 GND Printer chassis ground
2 TXD Data from printer
3 RXD Data to printer
4 RTS Always low
5 CTS Low when computer is ready to send data. Printer ignores this signal.
6 Not connected.
7 GND Signal ground
8 - 10 Not connected.
11 RCH Printer sets line low when ready to receive data. Same signal as Pin 20.
12 - 19 Not connected.
20 DTR Printer sets line low when ready to receive data.
21 - 25 Not connected.
Parallel Interface
Pin Name Function
1 STROBE Goes low for ≥ 0.5 µ s when active.
2 DATA0 High when active.
3 DATA1 High when active.
4 DATA2 High when active.
5 DATA3 High when active.
6 DATA4 High when active.
7 DATA5 High when active.
8 DATA6 High when active.
9 DATA7 High when active.
10 ACK 10 µ s low to acknowledge receipt of data.
11 BUSY Printer sets line low when ready to receive data.
12 PAPER High when paper runs out. Can be disabled with the User Setup Utility.
13 SELECT High when printer is on-line.
14 AFXT Normally high.
15 Not connected.
16 SIGNAL GND Signal ground
17 CHASSIS Chassis ground (isolated from signal ground)
18 +5V +5V DC output from printer
19 - 30 GND Twisted pair ground return
31 RESET Printer is reset when this signal goes low.
32 ERROR Low when printing cannot continue due to error.
33 EXT GND External ground
34 - 35 Not connected
36 SELECT IN Normally low.