T-40 User’s Manual
17
21
Signal Ground (Data 2)
22
Signal Ground (Data 3)
23
Signal Ground (Data 4)
24
Signal Ground (Data 5)
25
Signal Ground (Data 6)
26
Signal Ground (Data 7)
27
Signal Ground (Data 8)
28
Signal Ground (PError, Select, and nAck)
29
Signal Ground (Busy and nFault)
30
Signal Ground (nAutoFd, nSelctIn, and nInit)
31
H
nInit
32
P
nFault
33
Not defined
34
Not defined
35
Not defined
36
H
nSelectIn
36
H
nSelectIn
²
H stands for the host and P stands for the printer;
²
The letter “n” in front of signal name indicates that the low level is effective;
²
In data transmission, the host should not ignore “Busy” signal; otherwise print data may be
missing;
²
If the host cannot provide all the signal lines listed in the table above, the communication
may fail;
²
Parallel interface signal adopts TTL level; the rise and fall time of the signal from the host
must be controlled within 0.5 s when it is used;
²
For the interface, the signal line should use twisted pair with feeder line end, with the
feeder line end connected to signal ground;
²
The parallel interface connecting wire should be as short as possible on condition that it
meets the use condition.
