Epson FX Series User Manual page 317

ESCape"s" - Half-speed printing
On the FX, prints at half the normal speed, which results in 80 char-
acters per second.
On the RX, prints at half the normal speed, which results in 50
characters per second.
Dumping programs in hexadecimal
On the FX and RX, you can use the hex dumping facility to aid you
in debugging. All codes sent to the printer are dumped onto the paper
in their hex format, which lets you see exactly what the printer is
receiving from the computer.
You turn this facility on as you turn the printer on. As you turn on
the FX, hold down the FF button. As you turn on the RX, hold down
both the FF and LF buttons. For either model, you stop dumping in
hex by turning off the printer.
The FX-80 prints the hex dump at 20 numbers per line; this leaves 2
spaces between each pair of numbers. The FX-100 prints the hex dump
at 34 numbers per line; this leaves 2 spaces between each pair of num-
bers.
The RX-80 prints the hex dump at 26 numbers per line; this leaves 1
space between each number.
Alarms
The FX and RX have different alarms for the various error condi-
tions. See Appendix F.
Typestyles
On the FX and RX, you can print in 128 typestyles.
DIP switches
Each model has its own arrangement of DIP switches. See Appen-
dix E.
Pin feeder
Only the FX-80 has a built-in pin feeder.