Epson FX-880 Service Manual page 138

Table A-3. Connector Pin Assignments-CN1 (continued)
Pin I/O Signal
19 to GND
30
31 In /INIT
32 Out /ERROR
33 GND
34 NC
35 Out +5 V
36 Out /SLIN
Pin I/O
1 to 6
7 Out
8 Out
9 In
10
11 Out
12 Out
13 In
14 In
15 In
16 Out
17 Out
18 Out
19 to 24
25 Out
26 Out
27 Out
28 Out
29 In/Out
30 In/Out
31 In/Out
32 In/Out
EPSON FX-880/FX-1180 Service Manual
Function
Signal ground.
Initializes the printer.
Indicates an error condition.
Signal ground.
Not connected.
This line is pulled up to +5 V through 1.0K .
Always HIGH when the printer is powered on.
Table A-4. Connector Pin Assignments-CN2
Signal Function
+5 +5 VDC line
TXD Transmit data
/READY Ready to receive data
RXD Receiving data
NC No connected
/RST Reset
INH Inhibit
/CMREQ Command request
/WRRDY Write ready
/RDRDY Read request
/WR Write
/RD Read
/CS Chip select
GND Ground
A3 Address bus bit 3
A2 Address bus bit 2
A1 Address bus bit 1
A0 Address bus bit 0
D7 Data bus bit 7
D6 Data bus bit 6
D5 Data bus bit 5
D4 Data bus bit 4
Appendix
A-3