REV.-A
Table 1-17. Connector Pin Assignments and Signal Function (cent’d)
Pin No. Signal Name
Return Pin No.
DIR
Functional Description
33
GND
Same as with Pin No. 19 to 30.
34
NC
Not used.
35
Pulled up to
+5V
through 3.3 K ohms resistor.
36
SLCT-IN
In
The DC
l/DC3
code is only valid when this signal is
“HIGH” level.
(Internal fixing can be carried out with Jumper- l.)
NOTES: 1.
2.
3.
4.
“DIR” refers to the direction of signal flow as viewed from the printer.
“Return” denotes “TWISTED-PAIR RETURN” and is to be connected at signal ground level.
As to the wiring for the interface, be sure to use a twisted-pair cable for each signal and
never fail to complete connection on the Return side. To prevent noise effectively, these
cables should be shielded an connected to the chassis of the host computer and the printer,
respectively.
All interface conditions are based on TTL level. Both the rise and fall times of each signal
must be less than
0.2Ks.
Data transfer must not be carried out by ignoring the
ACKNLG
or BUSY signal.
(Data transfer to this printer can be carried out only after confirming the
ACKNLG
signal
or when the level of the BUSY signal is “LOW”.)
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