Epson PX-8 User Manual page 99

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