Epson SQ-B50/2550 Technical Manual page 270

REV.-A
Table A-5. E05A22EA Terminal Functions
Pin No. Terminal I/O Description
1 CHA 0 Printhead charge pulse A
2 CHB 0 Printhead charge pulse B
3-6 AB3 -ABO I Address bus 3 - 0
7 TEST
- Test terminal for production
8 RST
I
Reset signal terminal
9 Vss
- GND
10- 17 D7 -DO
I/O Data bus 7 - 0
18 Vss - GND
19 H12
0 Head data output 12th nozzle
20 H11
0 Head data output 11 th nozzle
21 H10 0
Head data output 10th nozzle
22 H 9 0
Head data output 9th nozzle
23 H 8 0
Head data output 8th nozzle
24 H 7 0
Head data output 7th nozzle
25 H 6 0
Head data output 6th nozzle
26 H 5 0
Head data output 5th nozzle
27 VSS(GND)
-
GND
28 H 4 0 Head data output 4th nozzle
29 H 3 0 Head data output 3rd nozzle
30
H 2
0 Head data output 2nd nozzle
31 H 1 0 Head data output 1st nozzle
32 VDD(+5V)
-
Power sourse
33 - 35 PO- P2
I/O Multi purpose I/O (TTL level)
36 VSS(GND)
-
GND
37 P3
I/O
Multi purpose I/O (TTL level)
38 H 13
0
Head data output 13th nozzle
39 H 14
0
Head data output 14th nozzle
40
H 15
0 Head data output 15th nozzle
41 H 16 0 Head data output 16th nozzle
42 H 17 0 Head data output 17th nozzle
43 H 18 0 Head data output 18th nozzle
44 VSS(GND) - GND
45 XIN I External x'tal terminal
46 XOUT 0
47 CS 0 Chip Select signal
- -
48 DREQ 0
DMA Request signal
- ~
Print Timing Signal input
49 PTM(PTS)
I
50 WR I Write strobe
51 RD
I Read strobe
52 VSS(GND) - GND
A-12