BASIC PROGRAMMING
SECTION 4. 11
If the echo switch is left 'on', double characters will appear
on the screen, This in no way affects communication, but makes
outgoing messages hard to read!
Half duplex occurs when the host does not echo characters back
to HUNTER. In this situation, the echo switch should be 'on' to
allow outgoing messages to be read by the operator. This method
does not guarantee that data sent to the host is being correctly
interpreted.
A third mode,
Simplex, occurs when data is sent in only one
direction at one time and is otherwise similar to Half duplex.
HUNTER is not concerned which mode is in use,
4.11.4.4 Protocol
Unfortunately, very few dial-up databases support any kind of
protocol, so that generally HUNTER's 'none' option should be
used. Note that 1200 baud is the fastest recommended speed for
no protocol program loading,
However, some systems do support 'XON/XOFF' although implement-
ations vary between computers - seek advice from HUSKY Computers
if difficulty is encountered,
4.11.4.5 Other Parameters
The setting of 'NULL' and 'LF' are generally not material in
mainframe communication, so that '0' is recommended for NULL
count. See below for LF.
4,11.4.6 Terminator
HUN'lrER's 'ENTER' key generates CR (Carriage Return), but some
mainframes expect other terminators. Examples are Control C and
LF (Line Feed), or 'New Line', Consult your computer manual for
details.
4. 11.4,7 Delete
4, 11.5
VER. V091·
HUN'lrER's DEL (Delete) key generates 'rubout'. Few mainframes
recognise this, or in many cases allow any deletion at all!
'Cursor left' may work in some cases.
ACOUSTIC COUPLERS
Good qua] ity communication can often be achieved over surprising
distances with acoustic couplers at 300 baud, but this method is
not. recommended for routine daily use.
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