Hardware Description - Epson C824431 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 Direction*
Protective
1
Ground
Transmitted
2
Data (TXD)
Received
3
Data (RXD)
Request to
4
Send (RTS)
Signal
7
Ground
Reverse
11 Channel
(=2nd RTS)
Data
20 Terminal
Ready (DTR)
- Chassis ground
Out Transmitted serial data
In Received serial data
This signal is always at the
Out
positive EIA level.
Return path for data and control
In
signals.
This signal is at the positive EIA
Out level when the printer is ready to
accept data entry and at the
negative EIA level when the
printer is not ready to accept data
entry. Operator can invert the
Out
polarity of this signal with
jumper J2.
19
Description