1.
I/F board connector
:
EIA standard 25-pin Cannon
type.
2
For signal description and pin assignment, refer to
the table below:
Table 11. Signal
Description
and Pin Assignment
No.
I
2
o u t
data
out
This
is
at the
6
21
20
Note
1
The column heading “Direction” refers to the
direction of signal flow as viewed from the printer.
2
All signals except TTY-TXD and TTY-RXD comply
with EIA RS-232C standard.
RECOMMENDED CIRCUIT CONNECTIONS
Recommended line driver and line receiver for RS-232C
signal level settings., (As viewed from the host com-
puter.)
Figure 4. RS-232C
MC
75199
Recommended line interface circuit for 20 mA Current
Loop signal level settings. (As viewed from the host
computer .)
5.
I
Note
The value of “R” should be selected so that the loop
current is set between 10 and 20 mA. The
should
be 3v to 24v.
22
