Epson PX-8 - 4.3 Serial Interface

mini
connector
DIN mini
connector
CG E------E
GND 1------
TxD
2 _____________ 2
3--------------- 3
RxD
RTS 4
4
CTS 5
5
DSR 6 -----=>.-~"""'
6
DTR 7 _---,~~.J
7
DCD 8
8
Fig. 4.17 Cable #726
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4.3 Serial Interface
The serial interface is used to connect optional disk drives (drive D:, E:, F: and
G: in the default assignments) or a serial printer. The location
of the interface
connector
is shown below.
Fig. 4.18
The serial interface is connected to external devices through a miniature con-
nector. Pin assignments
of this connector are as follows.
Pin No.
Signal
Signal
Description
of Signal
Symbol Direction
1
GND - Ground
2
PTX OUT
Transmitted data
3
PRX IN
Receive data
4
(RTS)
OUT
Request to send
SERIAL
3@25
4 8
6 E
PX-8 side
5
(CTS) IN Clear to send
6
PIN
IN Status ready
7 POUT
OUT Control signal
8
E
FG
-
Frame ground
NOTE:
The direction of signal is as viewed from the PX-8.
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