cept
data
transmissions. Transmission
is
enabled when this signal
is
ON and
disabled when it
is
OFF.
DSR (Data set ready)
DSR
is
the signal which indicates whether the connected device
is
ready for oper-
ation. When this signal
is
ON, the applicable device
is
connected to the inter-
face cable and
is
ready to accept data transmission/reception control signals.
DTR (Data terminal ready)
DTR
is
the signal output by the PX-8
to
the connected device
to
indicate that
it
is
ready to receive data.
DCD
(Data carrier detect)
The DCD terminal
is
used for detecting the carrier signal from the connected
device.
FG
(Frame ground)
This terminal
is
connected to the chassis
of
the PX-8; ordinarily, it
is
also con-
nected via the external cable to the corresponding terminal
on
the other device.
RS-232C cables
Please consult your Epson dealer for the correct type
of
cable to connect to
the other equipment. The cables available from EPSON are as
follows:-
1)
Cable # 724
This cable
is
used to connect the PX-8
to
a modem
or
acoustic coupler.
2)
Cable #
725
This cable
is
used to connect the PX-8
to
a computer which
is
equipped with
an RS-232C interface and a DB25 connector.
It
is
also used to connect the
PX-8 with a serial printer
or
other
110
device which
is
equipped with an
RS-232C interface.
3)
Cable #726
This cable
is
used to conllect two PX-8s through the RS-232C interfaces.
This
is
also referred to as the null modem cable.
4-26
PX-B side
mini
connector
TxO
2
RxO 3
RTS
4
CTS
5
OSR 6
OTR 7
OCO
B
0825
connector
2
3
4
5
6
B
9
19
20
21
25
Fig.
4.15
Cable #
724
4-27
mini
connector
0825
connector
CGE~
GNO
1
TxO 2
-~~,
2
RxO 3
3
RTS 4
4
CTS
5
5
OSR 6
6
OTR 7
OCO B
B
9
19
20
21
25
Fig.
4.16
Cable #
725
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