User's Manual

12
Since ASCII 19 is XOFF, the ASCII 19 character can be changed to ASCII
20 for XON/XOFF sensitive systems by changing the Base Station Setup.
See Chapter 2; RF System Setup for details.
The Base Station Initialized message is provided so that the host will
know that there has been a power interruption on the Base Station. When a
serial device powers up, the first byte transmitted is often garbage.
QBASIC handles the garbage character without incidence, but GWBASIC
does not unless ON ERROR GOTO is used to trap the error. Be aware of
this potential garbage-byte problem in your programming. To isolate and
test for the problem, power up the Base without the serial cable connected.
After you power the Base up, plug in the serial cable. You will not see the
“Base Initialized” message but it should not matter when testing for the
garbage data.
If a terminal is signed-on to the system, and the base station is re-initialized,
the following message is sent to the terminal:
Base Reinitialized X
Cycle Power on RF
Terminal and Sign-on
again to Restart_
where X is either a P (base initialization was power-related) or H (base
initialization was host-related.
Control Keys for Possible Programming
There are some keys on the RF Terminal keypad that when pressed, can
transmit special ASCII characters back to the host program. This feature
might be used by a programmer to allow the operator to review transactions.
You can use these keys for special program functions, such as scrolling
thru data, backing up steps, jumping, finishing a process, etc The keys
are as follows:
Key Code transmitted to Host
UP ARROW key FS (ASCII 28)
DOWN ARROW key GS (ASCII 29)
LEFT ARROW key RS (ASCII 30)
RIGHT ARROW key US (ASCII 31)
BEGIN key ETB (ASCII 23)
END key CAN (ASCII 24)
SEARCH key VT (ASCII 11)
The STATUS key is reserved to only display the Time and Date.