Epson PX-8 User Manual page 79

iii)Option 3 (add ETX and delete LF) has the same effect on line feeds as
Option 2, but it also adds an 'end of text' code (ASCII code 03
decimal; hexadecimal 03) to each transmitted carriage return after delet-
ing LF code there. When receiving, data is processed as is. This allows
communication with computers which require the ETX code instead of
the LF code.
When you have selected which mode you wish to use on the PX-8 by pressing
[ RETURN [
key, the screen will display:
Modes of TERM
1
=
Normal
2 = Del ete LF after CR (send)
I
In-sert LF after CR (recei vel
3
=
Insert ETX and Delete LF after CR (send)
Select a mode 1
displayl printl sendl receivel
lexit
The bottom line of the screen shows the functions assigned to the
00
keys.
When these functions are inactive they appear in lower case characters, and
when activated by pressing the relevant key they appear in upper case. These
have the following effect:
[§J - DISPLAY ON/OFF
This switches the display ON or OFF while transmission is in progress. Nor-
mally, transmitted data does not show on the PX-8's screen, so switching the
display on allows you to see what is transmitted as it is sent. If the display is
switched on while data is being received (either from the keyboard or from an
external source) the data will show twice on the screen. The effect is that any-
thing sent from an outside source instead of appearing on the screen as 'Hello'
will appear as 'HHeelllloo'. This would also be the case if the display were
switched on while using the PX-8 as a terminal.
[ PF2 [ -
PRINTER ON/OFF
Printer output can be switched on or off during reception or transmission to
produce a hard copy of the data to be transferred. Thus, whatever appears on
the screen will also appear on the printer. Remember that because the TERM
program uses the RS232C port the printer must be connected to the serial port.
The [PF3 [ and [PF4 [ assignments at the bottom of the screen disappear when
PRINTER is ON.
3-78
[ PF3 [ - SEND A FILE/TERMINATE TRANSMISSION
A file can be sent to the external device and its transmission ended using this
key. This procedure is fully described in 1.4 below.
[PF4[ -
RECEIVE A FILE/TERMINATE RECEPTION
Pressing the [PF4[ key will make the PX-8 prompt for the name of the file to
be received. A full description of this can be found in 1.3 below.
[PF10[ -
EXIT
Pressing
IPF10[
and will cause the PX-8 to exit from the TERM program at any
time.
[ HELP
1-
OUTPUT BREAK SIGNAL
Pressing the
I
HELP
1
key outputs the BREAK signal to the receiving computer.
Note:
When using TERM only the junction displayed on the 8th line can be selected.
1.1 SENDING AND RECEIVING MESSAGES
When transmitting messages between computers it is necessary to have a pro-
gram to handle the data being transmitted. Since there are many such programs
and computers, the EPSON QX-IO is used as an example with the QX-I0 TERM
program as the executing software.
First of all, execute the TERM programs on both the PX-8 and the QX-IO.
The QX-IO screen will show:
QX-IO TERMinal or Remote ver 1.8
rs232c : bit rate
=
31111 parity
=
no stop bit
=
1 data char
=
8bit
Terminal mode ....... 1
Remote mode ......... 2
Normal mode ......... 3
change rs232c ........ X
select 1-3 or X?
Comparison of the RS232C parameters with the default parameters of TERM
on the PX-8 will show that the handshaking does not match. The quickest way
to make an alteration is to change the QX-IO parameters by selecting 'X'. When
the screen changes to that of fig. below press 'B' and '5' to change the bit rate
to 4800 and the stop bits to 2:
3-79