RW-337D Service Manual I Page 6 of 61
Signal
Min. value (ns)
Max. value (ns)
tSetup
750
-
tReady
0
-
tStb
750
-
tBusy
0
500
tHold
750
-
Time Request of Parallel Interface
3.3.3 Interface signal
Pin
Signal source
Signal definition
Pin
Signal source
Signal definition
1
H
nStrobe
19
Signal Ground
2
H
Data 0 (Least Significant Bit)
20
Signal Ground
3
H
Data 1
21
Signal Ground
4
H
Data 2
22
Signal Ground
5
H
Data 3
23
Signal Ground
6
H
Data 4
24
Signal Ground
7
H
Data 5
25
Signal Ground
8
H
Data 6
26
Signal Ground
9
H
Data 7 (Most Significant Bit)
27
Signal Ground
10
P
Ack
28
Signal Ground
11
P
Busy
29
Signal Ground
12
P
PError
30
Signal Ground
13
P
Select
31
H
nInit
14
H
nAutoLF
32
P
nFault
15
Not defined
33
Signal Ground
16
Logic Gnd
34
Not defined
17
Chassis Gnd
35
Not defined
18
P
Peripheral Logic High
36
H
nSelectIn
Parallel interface signal definition
Caution:
H stands for host end, P stands for printer end.
Parallel interface signal adopting TTL level. Please make sure that both ascending and descending time of the
host end are less than 0.5
s when using the printer to print.
During data transmitting, the host end should not neglect the Busy signal, otherwise the printing data will be
lost.
The parallel interface signal cable should be as short as possible.
