Interface Signals - Epson TF-20 Reference Manual

5.2 Interface Signals

(1) Interface connector to the HX-20
Interfacing with the HX-20 is carried out by daisy chaining using cable set
#707.
Connector name: DIN 6 Pin (female)
Direction (as
Signal
viewed from
Pin No.
name
Flexible Disk Unit)
OUTPUT
RXS
1
OUTPUT
PINS
2
INPUT
TXS
3
INPUT
POUTS
4
I GNDS
5
Description
Output signal from the TF-
20 This signal is con-
nected to other terminals
or the serial input of the
HX-20
OR signal between the
PIN0 terminal and the
DTRA terminal of internal
serial controller uPD7201
Usually, this signal is not
used
Serial input signal from the
HX-20 to the TF-20
Input signal This signal is
connected to the CTSA ter-
minal of internal serial con-
troller uPD7201 through
the line receiver "HIGH"
level of this signal enables
serial output
Ground
—
(2) Interface Connector to Other Terminals
Connector name: DIN 5 Pin (female)
5.3 Interface Level
RS-232C serial interface: Logic 1 (-3 to -27V)
Logic 0 (+3 to +27V)
NOTE:
The interface on the rear panel of the TF-20 is not used.