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CHAPTER 15 DEDICATED INSTRUCTIONS
15
15.7 GP.ECPRTCL
(c) Timing chart
The E71 performs the following process according to the timing of cancel request.
The followings describe the operations of protocol cancellation according to the timing.
• When the cancel request is performed before sending
(when "1" (Waiting for transmission) is set in Protocol execution status (address: 54C0
H
))
Protocol execution status
(address: 54C0
H
)
E71 operations at cancel request
0: Unexecuted No process
1: Waiting for transmission The E71 cancels the sending and terminates the dedicated instruction forcibly.
2: Sending The E71 terminates the dedicated instruction forcibly at sending completion.
3: Waiting for data reception The E71 cancels the receiving and terminates the dedicated instruction forcibly.
4: Receiving The E71 terminates the dedicated instruction forcibly at receiving completion.
5: Completed
The E71 terminates the dedicated instruction when protocols are executed
consecutively.
The E71 does not send a send
packet to the connected device
even when a receive data or a
protocol exists.
1: Cancellation request 2: Cancel completed
Connection No.n
Protocol cancellation specification
(54D3
H (when the value of n is 1))
Cancel
E71
Connected device
ECPRTCL instruction
Completion device
Send packet
Send packet
Completion device + 1
The device turns on
upon abnormal end.
Waiting time
to send
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