Epson EPL-5500 Service Manual page 132

Appendix
Table A-3. CN4 Pin Assignments (Continued)
Pin No.
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
A-6
Signal Name I/O
RD
O
WR
O
IREQ
O
NMI
O
DREQ
O
DTCT
I
VCC
—
VCC
—
VCC
—
VCC
—
TXD+
—
TXD-
—
RXD+
—
RXD-
—
DTR
—
CTS
—
NC
—
NC
—
LCD
—
SWRD
—
GND
—
GND
—
GND
—
GND
—
RESET
O
INH
O
CMREQ
I
WRRDY
I
RDREQ
I
WRT
O
RDT
O
TYPB
I
TXD
—
READY
—
RXD
—
NC
—
VCC
—
VCC
—
VCC
—
VCC
—
EPL-5500 Service Manual
Description
Read strobe signal
Write strobe signal
Interrupt to option
Non-maskable interrupt
Data request
LT option used/unused
+5 VDC
+5 VDC
+5 VDC
+5 VDC
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Ground
Ground
Ground
Ground
Reset signal
I/F disabled
Request command
I/F ready
Data read request
Write enable
Read enable
Type-B I/F used/unused
Not used
Not used
Not used
Not connected
+5 VDC
+5 VDC
+5 VDC
+5 VDC
Rev. A