8-5
(UURU,QWHUUXSW0RGH&RPPDQG^)(,0`5HPRWH
The Error Interrupt Mode command is used to set or reset the Error Interrupt Mode.
When the Error Interrupt Mode is set, the TCS generates an interrupt to the host immediately
upon detecting an error. The host can use this interrupt to detect whether the operational state of
the TCS has been affected by an error. The host can then act appropriately to ensure that proper
operation resumes. This might entail resending command sequences to the TCS.
For instance, an error interrupt is generated whenever screen memory (and hence Expansion
Memory) becomes full and indicates to the host that no more screens can be stored. The host
could then delete or simplify an existing screen to create more room for the new screen.
When the Error Interrupt Mode is reset, the TCS does not generate an error interrupt when an
error is encountered. Instead, the host must poll the TCS using the Request Error Status
command to determine whether an error has occurred.
After the TCS sends an error interrupt, it automatically resets the Error Interrupt Mode. This
gives the host time to finish processing the first interrupt before allowing the TCS to send
another. The host must set the Error Interrupt Mode again when it is ready to be asynchronously
notified of another error.
While Error Interrupt Mode is reset, the TCS holds any error until the host polls for error status
by sending the Request Error Status command. If subsequent errors occur before the host has
polled for the first one, the TCS does not report them to the host, although it continues to display
them in the Operational Status Window. If the TCS is already holding an error when the host sets
the Error Interrupt Mode, an error interrupt is sent immediately.
The conditions that can cause an error, the messages the TCS displays in the Operational Status
Window, and the error report the TCS sends to the host are described in Chapter 9.
'()$8/7
Reset. (The TCS does not send error interrupts.)
23(5$72586$*(
None. (This is a remote command only.)
+26786$*(
<ESC>[>7l
Resets Error Interrupt Mode. (The terminator for the reset command is the letter "l", ASCII
6C hex.)
<ESC>[>7h
Sets Error Interrupt Mode.
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