Worth Data 701 RF manual Sequence Error Message, Illegal Command, ?Cr, @1,1,1,Scan Serial Number

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
1	RF Terminal ID
2+	Illegal Command
Last	Termination of message

Possible values

0-9, A-Z, a-z, - =

?

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

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