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CP 521
Backup battery missing (X7
•
No battery has been inserted in the CP 521, or
•
the battery is defective.
Job not accepted (X8
H
This message is sent to the CPU on two occasions:
•
A CPU job request cannot be accepted because the previous job has not yet
been processed by the CP operating system. This response can be scanned two
program scans after allocation of the CPU job request.
•
In the case of message buffer overflow.
The CP operating system writes the CPU job requests identified on page 6-41
into the message buffer for further evaluation. This buffer can only be filled
by the CPU job requests "03
"06
" are also stored in the message buffer but they cannot cause a buffer
H
overflow although this can be caused after the CP has received 255 CPU "Print
message texts" jobs. The CP message can only be scanned 3 program scan
cycles after allocation of the job, as with all other responses.
Character delay time exceeded (X9
The time between two received characters is greater than the value set in
parameter block 7.
The data received up to the error is transferred to the CPU as a message.
Parity error (XA
)
H
The parity of received characters does not agree with the parity configured in
parameter block 0.
The message is not transferrred to the CPU and is not stored in the receive
mailbox.
Receive after XOFF or receive after DTR = 0 (XB
In the case of XON/XOFF protocol:
The CP 521 sends XOFF to the peripheral device if
•
less than 20 bytes are free in the receive mailbox
•
the CP has received more than 100 messages.
The CP 521 sends XON again only when more than 256 bytes are free in the
receive mailbox.
GWA 4NEB 812 6030-02b
)
H
)
" and "04
". CPU job requests "02
H
H
)
H
ASCII Mode
", "05
H
)
H
" and
H
7-59
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