Epson PX-8 User Manual page 102

The communication speed is 38400 bps when disk drives are connected and 4800,
600 or 150 bps when a printer is connected. When the serial interface is chosen
as the printer interface, the default setting is 4800 bps. Which device is con-
nected is determined by the CONFIG program.
Cable #723 (Fig. 4.20) is used to connect disk drives and cable #725 (Fig. 4.16)
is used to connect a printer.
~========~I~
DIN mini
connector
CG
GND 1
PTX 2
PRX 3
(RTS) 4
(CTS) 5
PIN 6
POUT 7
DIN
connector
4
Fig. 4.20 Cable # 723
The PX-8 can also detect than an EPSON Floppy Disk Drive is attached and
will automatically set the baud rate to 38,400 baud without the need to use
CONFIG.
When a printer is selected, logical device LST: is assigned to the serial inter-
face. Therefore,
PIP LST:
=
A:SAMPLE. TXT
outputs the contents of file SAMPLE. TXT to the printer connected to the seri-
al interface.
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4.4 Using Printers with the PX-8
Many applications of the PX-8 will require the use of a printer, e.g. documents
entered using Portable WordStar™.
It
is also convenient to have a hardcopy
(Le. a copy printed on paper) of BASIC program listings, disk directories and
many other day to day transactions.
4.4.1 Connecting a printer
To connect an EPSON printer to the PX-8 an additional serial interface is re-
quired. The printer must be connected to the interface connector (RS-232C or
serial) which has been selected by the CONFIG command. The default setting
is to the RS-232 interface. The data transfer rate should be set to 4800 bps on
both the printer and the PX-8. This is the default setting on the PX-8, but may
have been altered for other communication. The current setting can be found
using the CONFIG program.
f
Th.
port
~"";,
d""m;nod
by
the printer ifF setting. (See
Fig. 4.21
CONFIG.)
If
the PX-8 and the printer have different transmission rate settings the result
will be that the output to the printer will be unintelligible. For example:
Fig. 4.22
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