Epson PX-8 User Manual page 100

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