7
3) Interface Connector
Pin
SIG.
DIRCTION FUNCTION
2
TXD
OUT
Transmitter data
3
RXD
IN
Receive data
6
DSR
IN
l
Indicate Whether host could receive data or
not .
l
Can do it on SPACE , not do it on MARK
l
Can operating on DSR/DTR Handshaking, printer
transmitter data after checking the signal.
l
Use it on Hardware Handshaking.
7
GND
-
Signal Ground
20
DTR
OUT
l
Indicate Whether printer could receive data or not.
l
Can do it on SPACE , not do it on MARK, when
setting DTR/DSR control
l
It’s on MARK as bellows;
-
Full buffer in printer
-
Operating on error
-
On self-test
25 Pin D-SUB Connector
(MALE)
Printer
RXD 2
TXD 3
DTR 4
GND 5
DSR 6
2 TXD
3 RXD
6 DSR
7 GND
20 DTR
9 Pin D-SUB Connector
(FEMALE)
HOST
8
3-2. Parallel interface
1) Parallel
Data Transmission
8-bit parallel
Handshaking
STROBE and BUSY or ACK
Connector
D-SUB 25 MALE
2) Interface Connection
1 STROBE 1
2 2
↕
DATA 1 ~ 8
↕
9 9
10 ACK 10
11 BUSY 11
12 P. E. 12
15 ERROR 15
18 ~ 25 GND 18 ~ 25
25 Pin D-SUB Connector
(MALE)
HOST
25 Pin D-SUB Connector
(FEMALE)
Printer
