Epson FX 890 - B/W Dot-matrix Printer - Page 88

FX-1180/FX-880 Service Manual
Appendix
Rev. B
7-
3
Table 7-3. Connector Pin Assignment - CN2
Pin No. I/O Signal Name Function
1 - 6

+5 +5 V
7 O TXD Transmit data
8 O /READY Ready to receive data
9 I RXD Receive data
10

NC Not connected.
11 O /RST Reset
12 O INH Inhibit
13 I /CMREQ Command request
14 I /WRRDY Write ready
15 I /RDRDY Read request
16 O /WR Write
17 O /RD Read
18 O /CS chip select
19 - 24

GND Ground
25 O A3 Address bus bit 3
26 O A2 Address bus bit 2
27 O A1 Address bus bit 1
28 O A0 Address bus bit 0
29 I/O D7 Data bus bit 7
30 I/O D6 Data bus bit 6
31 I/O D5 Data bus bit 5
32 I/O D4 Data bus bit 4
33 I/O D3 Data bus bit 3
34 I/O D2 Data bus bit 2
35 I/O D1 Data bus bit 1
36 I/O D0 Data bus bit 0
Table 7-4. Connector Pin Assignment - CN3
Pin No. I/O Signal Name Function
1 O PSC
2 I PWDN
3 - 4

+5V +5V
5 - 6

GND Ground
7

+35V +35V
8

+35V +35V
9 - 10

GP Ground
Table 7-5. Connector Pin Assignment - CN4
Pin No. I/O Signal Name Function
1 I HP HP Detector signal
2

GND Ground