User's Manual

6-7
Where 2 is the Terminal ID, 123 is the data and CR is the termination.
Besides data, there are other messages that the Base Station will send to
the Host:
Serial Reply
After a Serial command (@S) has been successfully completed, the Base
Station sends to the Host the Terminal ID followed by a CR. Serial commands
are typically used for attached serial printers. Serial commands cannot be
combined with other commands in a message to the Base Station/Terminal.
Remember, you can only send 247 characters (including the ID + @S + EOT).
SIGN ON
To login to the host computer, the user presses a key on the RF Terminal at
power-up to get to the SIGN ON screen. As the user SIGNs ON, the Base
Station sends back the following SIGN ON message to the host:
Byte position Function Possible values
1 RF Terminal ID 0-F
2+ SIGN ON SI (ASCII 15) if 4 line display terminal
or; if 6 line display terminal configured
as 4 line display in firmware version
9075 or greater.
SYN (ASCII 22) if 6 line display
configured as a 6 line display in
firmware version 9075 or greater
Last Termination of
message
CR (ASCII 13)
After a terminal SIGNS ON, the host should be prepared to acknowledge the
SIGN ON and give the terminal instructions, such as:
Standby for Assignment, Press ENTER to acknowledge
Nothing to do, Press ENTER and See Supervisor
Pick Item 1234
If there is something for the Terminal to do, the host should send instruction to
the terminal (as in “Pick Item 1234” above). If there is nothing to do at the time
of SIGN ON, the host should acknowledge the SIGN ON and tell the terminal to
Stand By or See Supervisor (see lines 1 and 2 above). You will notice that in
lines 1 & 2 above, there is a request for the operator to press the ENTER key.
This is required for the message to be a valid command - remember that all
messages must end with a request for data input. The host should then expect a
response from the terminal of Terminal ID + DATA (none if only pressing
ENTER key) + CR.
SIGN ON is a good way for the terminal operator who has not received instruction
from the host for several minutes to determine if he is still connected and if the