User's Manual

the terminal goes to sleep until the time it took the last time for the host to

respond has expired; then the terminal wakes up and listens. If it has

nothing, it retransmits its data and waits for a response.

The original data transmission could have collided with another message, or

the Base could have received the Terminal's data but had not yet received

the host's prompt response. If the previous transmission got through, the

Base Station knows that the data is a retransmission rather than a new data

transmission so it sends a message to the Terminal telling it:

“I have nothing for you from the host, go to sleep”.

While in “sleep” mode, the Terminal “wakes” up at a random interval and

asks “do you have anything for me yet”, waiting for either a “go to sleep”

message or a new data prompt. After each delays, the Terminal displays:

WAITING FOR HOST PROMPT

If a Terminal receives no response at all from a Base Station (no data

prompt or “go to sleep” message), it retransmits its data and waits for a

response. If the Terminal gets no response after 10 re-transmissions, it

assumes it out of range from the Base Station with which it was

communicating, and attempts of establish contact with any Base Station. If

the Terminal can't contact any Base Station, it displays:

TRANSMISSION FAILED

HIT ANY KEY_

Pressing a key on the Terminal starts the re-transmission process over

again. The RF Terminal will try to retransmit its data, displaying the

TRANSMISSION FAILED message after every 10 unsuccessful tries.

Can I change a prompt after it has been sent?

Normally once the Terminal has received a prompt from the host, it goes to

sleep and waits (as long as it takes) for the operator to scan or key

something in response. The host cannot send another prompt without

creating a "Sequence Error." You might want to change the prompt or

locate a lost terminal with beeping.

There is a special setting in the RF Terminal Setup in which you specify the

time (between 5 seconds and 7 minutes) you want the Terminal to quit

waiting for input from the operator, blank the screen, send back a special

control character to the host program, display "Waiting on Host Prompt"

and wait for a prompt from the host application program; the host

application program can choose to send back different instructions or

simply repeat the previous prompt's instructions, (See Automatic Check

Back in the Programming Section).