NOTE:
A warm boot will always return the RS-232C settings to' ihese defaults.
The RS-232C interface connector
is
provided
on
the rear panel.
Fig. 4.13
The pin assignments and signal descriptions are as follows.
RS232C
SERIAL
3~:
4~8
6 7 E
_Fig.
4.14
4-24
The standard RS-232C interface
is
connected to external devices through a minia-
ture connector. Pin ;ssignments
of
this connector are as follows.
Pin
No.
Signal
Signal
Description
of
Signal
Symbol Direction
I
GND
-
Ground
2
TxD
OUT
Transmitted
data
3 RxD
IN
Receive
data
4
RTS
OUT
Request
to
send
5 CTS
IN
Clear
to
send
6 DSR IN
Data
set ready
7
DTR
OUT
Data
terminal ready
8
DCD
IN
Data
carrier detect
E
FG
-
Frame"
ground
NOTE:
The direction
of
signal is as viewed from the P X-8.
The meanings
of
the various signals are as follows.
GND (Ground)
This terminal
is
used as the return line for the following signals.
TxD (Send data)
TxD
is
the signal used from transmitting data from the PX-S to the device (acous-
tic coupler, etc.) with which the PX-S
is
connected. This
is
possible when the
Clear to send signal
is
on.
RxD (Receive data)
RxD
is
the
data
signal from the acoustic coupler or other RS-232C compatible
device to the PX-S.
RTS (Request
to
send)
RTS
is
the signal which controls the communication function
of
the device
(acoustic coupler, etc.) connected
to
the PX-S. The connected device becomes
ready to send when this signal
is
ON.
CTS (Clear to send)
CTS
is
the signal which indicates whether the connected device
is
ready to ac-
4-25
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