Hardware Description - Epson C82305 Series User Manual

HARDWARE DESCRIPTION

1. I/F board connector: EIA standard 25-pin D-SUB
female connector.
2. For signal description and pin assignment, refer to
the table below:
Table 9. Signal Description and Pin Assignment
Pin No. Signal name
protective
1
Ground
Transmitted
2
Data (TXD)
Received Data
3
(RXD)
Request to
4
Send (RTS)
I
7 Signal Ground
Reverse
1 1 Channel
(=2nd RTS)
Data Terminalk t
20
Ready (DIR)
Direction
—
Text
Ill Received serial data
This signal is always at the
o u t
positive EIA level.
I
In
control signals.
Out
ready to accept data entry
and at the negative EIA
level when the printer is not
ready to accept data entry
O u t
Operator can invert the
polarity of the signal with
jumper 15.
19
Description
Chasis ground
Transmitted serial data
Return path for data and
This
EIA Level when the printer is
signal is at he positive