INfinity 510 Protocol Reference Guide - Sirit

Chapter 4 - Reader Behavior
In the following example, the state of the outputs is read and then all four
outputs are changed (i.e. those that were on are switched off and vice
versa):
> dio.out.all
ok 0xA
> dio.out.all=0x5
ok
Asynchronous notification of DIO changes
Whenever the state of digital inputs or digital outputs change, certain
events are generated. Depending on the specific needs of your application,
you may choose to register for some or all of these events.
event.dio.in.X value=Y – This event indicates that digital input
X has changed, and its new value is Y. X will be from 1 to 4, and Y will
be either 0 or 1.
event.dio.out.X value=Y – This event indicates that digital
output X has changed, and its new value is Y. X will be from 1 to 4, and
Y will be either 0 or 1.
event.dio.all in=X, out=Y – This event is sent whenever any
digital inputs or outputs change. It provides, in hexadecimal format, the
state of all digital inputs (X) and all digital outputs (Y). The format of X
and Y are the same as the format of the dio.in.all and
dio.out.all variables.
For example, if all four digital inputs are high, and then digital input 3 goes
low, the following two events are generated. In this case, digital outputs 2
and 4 are enabled (connected to ground):
event.dio.in.3 value=0
event.dio.all in=0x0b, out=0x05
Debouncing
Depending on the nature of the device connected to the digital inputs, some
debouncing may be necessary. The variable dio.debounce.X sets a
specific debounce time for each digital input. Input changes will only be
reported after the new value has been asserted for greater than the amount
of time specified by the debounce variable.
If very fast pulsed inputs are used, ensure the debounce time is not too low
(less than the pulse width), or an input pulse may be missed. If a noisy
switch contact is used as an input, ensure the debounce time is high
enough to account for the noise on the contact.
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