Chapter a
Using the RS232 Interface
Connecting peripherals to the RS232 Interface
As you know, the Spectrum character set comprises both single symbols
(letters, digits, etc.) and compound tokens (keywords, function names. etc.).
All these characters can be sent and received by the RS232 Interface to and
from any compatible serial device; for example, a printer, a modem or another
RS232 Interface connected to a different kind of computer.
To connect any of these peripherals to the RS232. you should use a lead
with a B-way D-plug on one end and an appropriate plug for your peripheral
on the other. You should insert the D-plug into the back of the RS232, as
shown below. (For wiring details, see Appendix 4, page 49.)
Next, before you can use the RS232 you will need to adjust some of the
settings on the peripheral. These may include:
- the auto line feed, which should normally be switched to off. (The
Spectrum outputs a carriage return and a line feed on a “t” channel but
a carriage return only on a “b” channel. These t and b channels are
explained below.)
-
the parity on/off, which should be set to off.
- the number of bits, since the Spectrum puts out eight bits.
- the number of stop bits, since the Spectrum puts out one stop bit.
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