I/O Bootup Library; Chapter 5 I/O Bootup Library; Overview; Function - Casio PA-2400W Software Manual

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5. I/O Bootup Library

The I/O bootup library monitors the connection status of dedicated I/O Box and notifies user of the status.

This library supports only one function, iobox_chk(). The iobox_chk() function monitors and detects, for a

specified period, whether PA-2400W is mounted on I/O Box, and returns the result (mounting detected,

timeout error, or error). Each time this function is used, it is necessary to also execute "Permit interrupt, Wait

for interrupt and time-out, and Prohibit interrupt". The following diagram shows the range covered by this

library.

Fig. 5.1

PA-2400W

(1) iobox_chk ( TIME_OUT_SEC ) ;

Karnel

(2) Mounting

Because the interrupt signals are detected by their signal levels, they can be detected even if the order of (1)

and (2) is changed. (The connection status can be detected whether this function is called before or after the

PA-2400W is mounted on I/O Box is mounted, unless a timeout occurs.)

User Application

IOBOX1.DLL

(4) Interrupt Signal

I/O PORT: 0

I/O Box

(5) Return

Detection, Timeout

Error

(4) Timeout

(3) I/O Box ON Signal

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