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Check your program for the sequence error before starting again. The host program will have to reinitialize the
Base Station or you will have to cycle power on the Base Station and have the Terminal Sign On again in order
to continue.
Sequence Error Message
The host program must observe the one-for-one "host prompt/terminal response" protocol at all times. The
host cannot send a second data entry prompt until it has received a response to the first data entry prompt. If
it does, this is considered a Sequence Error. If the Base Station receives a command that is out of sequence,
it sends the following message back to the host:
Byte position Function Possible values
1 RF Terminal ID 0-9, A-Z, a-z, - =
2+ Sequence Error DC2 (ASCII 18)
Last Termination of message CR (ASCII 13)
If the Base Station receives 5 Sequence Error’s in a row, it transmits the following message to the Terminal
and shuts down: (the only host command that it will receive is *@EOT)
Base Shut Down
Due to Host Logic
Error
Check your program for the sequence error before starting again. You will have to reinitialize the Base
Station by host program control (*@EOT) or manually cycle power on the Base Station and have the
Terminal Sign On again in order to continue.
Illegal Command
When a terminal receives an illegal statement from the host, it will display the entire statement on the
terminal. Once the ENTER key is pressed on the terminal, the terminal sends a “?” back to the Base Station.
Byte position
Function Possible values
1 RF Terminal ID 0-9, A-Z, a-z, - =
2+ Illegal Command ?
Last Termination of message CR (ASCII 13)
For example, if Terminal #2 received an illegal command, the Base station would transmit to the host:
2?CR
If a command is sent from the host to the base station without a valid terminal ID character, such as:
@1,1,1,Scan Serial Number
since the command doesn’t specify which terminal it is meant for, the base sends the following message
back to the host:
*
?CR
If the Base Station receives more than 231 characters, it treats that statement as an Illegal Command. If it
sees more than 231 characters 5 times in a row, it transmits the following message to the Terminal and shuts
down:
Base Shut Down
Due to Host Logic
Error
You can re-initialize the terminal by sending *@EOT or by powering the base off and back on.