Parallel Interface Signals - Microcom 814M Operator's Manual

6.2.3 Parallel Interface Signals

Pin No.
Note:
−
H stands for host computer terminal and P stands for printer terminal.
−
Parallel Interface signals use TTL voltages. When it is used, please make sure both the rise and drop
time of host computer terminal is no longer than 0.5us.
−
When data transfers, the host computer should not ignore the busy signal, or else the print data may
be lost.
−
The length of parallel interface connection wire should be as short as possible.
Source
1 H
2 H
3 H
4 H
5 H
6 H
7 H
8 H
9 H
10 P
11 P
12 P
13 P
14 H
15
16
17
18 P
19
20
21
22
23
24
25
26
27
Table 6-3 Parallel Interface Signals Definition
Compatible mode
nStrobe
Data 0 (Least Significant Bit)
Data 1
Data 2
Data 3
Data 4
Data 5
Data 6
Data 7 (Most Significant Bit)
nAck
Busy
Perror
Select
nAutoFd
Not Defined
Logic Ground
Chassis Ground
Peripheral Logic High
Signal Ground (nStrobe)
Signal Ground (Data 0)
Signal Ground (Data 1)
Signal Ground (Data 2)
Signal Ground (Data 3)
Signal Ground (Data 4)
Signal Ground (Data 5)
Signal Ground (Data 6)
Signal Ground (Data 7)
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