CCJIHUNICATIONS SECTION 6.4
6.4,7
6,<!, 7. 1
6,4,7.2
VER.V09F
d) 8-bit
All eight bits are transmitted with no mod-
ification. This may be used to transfer binary
information.
On reception the implementation is:-
a) None
b) Odd or Even
c) 8-bit
Parity bit is ignored and set to logical 0,
The data is checked for an odd or even number of
logical 1 's,
If the check fails then the
character is received as 255 decimal (OFFH).
All eight bits of data are passed to the calling
program,
NOTE: The parity fail character (OFFH) is displayed as~-- on
the screen,
HANDSHAKING LINES
There are handshaking lines provided on the RS-232 port. These
signals are usually used when operating with a modem, The lines
conform to the standard RS-232 specification for use with
modems, for specific applications lines need to be enabled as
appropriate. In general, a straight 25 way cable will operate
with most modems, They may also be used when communicating with
slow devices, e.g. printers or for the HUNTER to hold up
incoming data. These lines will be discussed in turn,
CTS pin 5 (Clear to send) input to HUNTER,
This signal, selected on the transmit menu, controls data being
transmitted.
If selected (y) then only if the line is active (+ve) will data
be transmitted, The input is tested at the start of each
character in async or start of each block in sync. Data
characters are always completely transmitted even if CTS goes
inactive.
If deselected (n) then this input is ignored and data is always
sent.
RTS pin 4 (Request to Send) output from HUNTER.
The RTS handshake can be set to operate in three different ways
from either the Communications Menu or via Basic by poking the
RTS flag, see section 9, 7, MEMORY LOCATIONS. The three modes
are:
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