Epson FX 1170 - B/W Dot-matrix Printer Service Manual page 132

See Table 1-14 for CNI (Centronics interface).
Table A-2. CN2 (BOARD ASSEMBLY, C094 MAIN)
No. 1/0 Signal Name
1 - +5
2 - +5
3 - +5
4 - +5
5 - +5
6 - +5
7 0 TXD
8 0 READY
9 I RXD
10 - NC
0
RST
12 0
13 I
CMREQ
14 I W R R D Y
15 I R D R E Q
1 6 0 W R
0
17
18 0 Cs
19 -
20 -
21 -
22 -
23 -
24 -
25 0 A3
26 0 A2
27 0 A l
28 0 AO
29 D7
30 D6
31 D5
32 D4
33 D3
34
D2
35
D1
36 DO
Function
+5 VDC
+5 VDC
+5 VDC
+5 VDC
+5 VDC
+5 VDC
Transmit Data
Ready to Receive Data
Receive Data
No Connection
Reset
Inhibit
Command Request
W r i t e R e a d y
Read Request
W r i t e
Read
Chip Select
Signal Ground
Signal Ground
Signal Ground
Signal Ground
Signal Ground
Signal Ground
Address Bus Bit 3
Address Bus Bit 2
Address Bus Bit 1
Address Bus Bit O
Data Bus Bit 7
Data Bus Bit 6
Data Bus Bit 5
Data Bus Bit 4
Data Bus Bit 3
Bus Bit 2
Data
Data Bus Bit 1
Data Bus Bit O
Table A-3. CN3 (BOARD ASSEMBLY, C094 MAIN)
No. 1/0 Signal Name
2 PEF
Table A-4. CN4 (BOARD ASSEMBLY, C094 MAIN)
No. 1/0 Signal Name
1 -
2 I
Table A-4. CN5 (BOARD ASSEMBLY, C094 MAIN)
No. 1/0 Signal Name
2
GSW
Table A-6. CN6 (BOARD ASSEMBLY, C094 MAIN)
No. 1/0 Signal Name
1 0 PF A
2 0
PF ~
3 0 PF B
4 0
PF ~
5 0
6 0
Table A-7. CN7 (BOARD ASSEMBLY, C094 MAIN)
No. 1/0 Signal Name
2 HOME
A-3
Function
Signal Ground
Paper End, FRONT
Function
Signal Ground
Release Lever Position
Function
Signal Ground
Platen Gap Adjust Lever
Function
PF Motor Phase A
PF Motor Phase ~
PF Motor Phase B
PF Motor Phase ~
PF Motor Common
PF Motor Common
Function
Signal Ground
CR Home Position