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2.8.3 Control diagram for Remote I/O 4-wire Control
The control sequence for the ‘4-wire Control’ method is detailed below.
Fig. 2.8.2 Control diagram for 4-wire Control
Remote
System
Start Signal
(START)
Programmer
Active
Signal
(SPARE)
Programmer
FAIL
Signal
Programmer
is Active
(i.e. performing programming operation)
Programming operation
FAILED
(FAIL signal driven HIGH)
(FAIL)
or
Programmer
OK
Signal
Programming operation
OK (PASS)
(OK signal driven HIGH)
(OK)
Either 'OK' or 'FAIL' signal is asserted by the
programmer.
1
2
3
4
Key Programmer / Remote System Action
1
2
3
4
The Remote System asserts the programmer <START> signal to initiate the execution of a
‘Programming Project’.
The programmer will then assert the <ACTIVE> signal to indicate that it has commenced
programming.
At the end of the Programming operation the programmer asserts either the <OK> or <FAIL>
signal depending on the outcome.
The Remote System must then de-assert the <Start> signal to allow the programmer to reset
ready to program the next device.
PPM3 MKII Programmer - User Guide - V1.04 - 10 th May 2008
45
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