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PCL-721 – 32 Channel D/I Card

156,00  Excl. VAT

Introduction PCL-721 :

The PCL-721/723 is a 32/24-channel digital input card with independent
interrupt capabilities that allows the PCL-721/723 to work in the
background while the processor perform other jobs in the foreground. With
this feature, your system can do real-time Process monitoring without
polling its inputs, channel by channel.

The PCL-721/723 has two modes: normal and interrupt. While it is set to
normal mode, the PCL-721/723 serves as a general purpose multi-channel
digital input card. However,if it is set to interrupt mode, then each channel
will generate an interrupt request to the PC, once the channel input has
changed.

The 32digital input channels ofthe PCL-721 are divided into 4 groups. The
24 digital input channels of the PCL-723 are divided into 3 groups. Each
group handles8 digital input channels. There is a register that reflects the
interrupt status of each groups. Users can first read this register to check
which group caused the interrupt, then by reading the 8channels’ status of
that group, you can easily find which channel generated the interrupt. This
two-pass feature saves lot of time to determine which service routine should
be executed in your ISR (Interrupt Service Routine).

The PCL-721/723 is easy to configure. No switch or jumper settings are
needed (except the I/O base address). The IRQ level, individual channel’s
trigger mode (rising or falling edge), and interrupt mask (enable or disable)
are all software programmable

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 Introduction PCL-721 :

The PCL-721/723 is a 32/24-channel digital input card with independent
interrupt capabilities that allows the PCL-721/723 to work in the
background while the processor perform other jobs in the foreground. With
this feature, your system can do real-time Process monitoring without
polling its inputs, channel by channel.

The PCL-721/723 has two modes: normal and interrupt. While it is set to
normal mode, the PCL-721/723 serves as a general purpose multi-channel
digital input card. However,if it is set to interrupt mode, then each channel
will generate an interrupt request to the PC, once the channel input has
changed.

The 32digital input channels ofthe PCL-721 are divided into 4 groups. The
24 digital input channels of the PCL-723 are divided into 3 groups. Each
group handles8 digital input channels. There is a register that reflects the
interrupt status of each groups. Users can first read this register to check
which group caused the interrupt, then by reading the 8channels’ status of
that group, you can easily find which channel generated the interrupt. This
two-pass feature saves lot of time to determine which service routine should
be executed in your ISR (Interrupt Service Routine).

The PCL-721/723 is easy to configure. No switch or jumper settings are
needed (except the I/O base address). The IRQ level, individual channel’s
trigger mode (rising or falling edge), and interrupt mask (enable or disable)
are all software programmable

 Features, Application and Specifications of PCL-721 :

• 32 TTL digital input channels
• Independent interrupt capability
• Programmable IRQ level (IRQ2..IRQ7)
• Individual trigger (sense) mode
• Individual interrupt mask
• More than one PCL-721/723 card can be installed
in one PC to share the same IRQ level.
APPLICATONS
• Real-time process monitoring
• Background monitoring
• Switch sensing
SPECIFICATIONS
• Input channels: 32
• Logic level 0: rti, low (-0.5V to 0.8V)
• Logic level 1: TTL high(2.0V to 5.0V)
• Minimum trigger pulse width: 3Ons

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