Epson FX-980 Service Manual page 22

FX-980
Table 1-13.
Connector Pin Assignment and Signals for Serial I/F
Pin In/
Signal Name
*1
No. Out
2 TXD Out
20 DTR Out
11 REV Out
4 RTS Out
3 RXD In
7 Signal GND -
1 Chassis GND -
other NC -
*1: In/Out refers to the direction of signal flow from the printer's point of view/.
Product Description
Functional Description
Transmits data.
Indicates that the printer is ready to
receive data or not.
Connected directly to the DTR signal.
Request to send. Always SPACE level
when the printer is powered on. Pulled
up to +12 V via 4.7 K resistor.
Receives data.
Signal GND.
Chassis GND.
Not used. Not connected.
Firmware Specifications
Revision A
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