Epson LQ-2550 Technical Manual page 253

Pin
Terminal
No.
3
4 I
1
2 PA 1
5 o
o
6
7 o
16
o
8
9 o
10 PB 1 0
14 o
13 o
2 0
11
o
12
15 o
17 TXD o
RXD
18
19 PC2
21 TO o
22 PC5 o
c o o o
2 3
o
PC7
2 4
2 5 NM I
26
Table A-3. ~PD781 OHG Terminal Functions
Signal
Name
Parallel l/F AUTO FEED XT
AFXT
signal
Parallel l/F SLIN signal
I CRHM CR home position sensor sig-
PGHM PG home position sensor sig-
LDPL LD
solenoid OFF/ON
RL
RLPL solenoid
PTPL PT
solenoid OFF/ON
PE sensor PAPER STAY/END
I PESN
BUZ Buzzer
DTO
Serial data signal
CKO Serial data synchronous
clock
LOAD Serial data trigger pulse
LCDCE LCD
signal
LINE
O L S W ON
CS 1/0 handshaking
MINH
CS 1/0 handshaking
FNEN HF motor enable signal
TXD
RXD
SCK CS 1/0 clock
CRTM CR motor drive pulse
PFTM PF
motor drive pulse
HPW
Printhead coil trigger pulse
PNPON
Printhead driver drive voltage
ON/OFF
I Parallel/Serial
Pulled up
Description
OFF/ON
controller chip enable
switch signal
A-8
Notes
External 8-bit parallel l\F
External 8-bit parallel l/F
Printer mechanism
Printer mechanism
Printer mechanism
Printer
mechanism
Printer mechanism
Printer mechanism
Control panel
Control panel
Control panel
Control panel
Control panel
Control panel
RXS, pin 52)
51 )
pin
IC (1 3A: CKS, pin 53)
l/F board
Optional 81 XX