Using the HVCX1 Option for High Voltage/Current Outputs
CAUTION
Never connect external high-level devices to a Channel 0 port or to a Channel 1 port
which has not first been configured for this purpose. Failure to do so may result in
damage to the Digital488/80A.
The HVCX1 option provides buffering for all the digital I/O lines on the Digital488/80A. This means that
the HVCX1 option has 80 digital I/O lines that are divided into two 40-bit channels -- Channel 0 and
Channel 1. Each channel is divided into five eight-bit ports. Six high-level ASCII commands configure
the ports to be all inputs, all outputs or combinations in between. Thus, a configuration can range from 80
input lines to 80 output lines or combinations in between in multiples of 8 bits.
Once the Channel port(s) are configured for high level operation, they can be used to drive devices such as
switching relays, solenoids and displays. For example, a typical application may require a lamp and a relay
to be driven by the Digital488/80A. The relay is connected to data line 27 (Port 4) and the lamp is
connected to data line 37 (Port 5). These two ports must be configured as high-level outputs. These
devices would be connected as shown in the following figure.
Since a relay is used for this application, the flyback terminal is connected to the positive terminal of the
external power supply. Note also that the Ground lead of the power supply should be connected to Pin 50
on the DB-50 connector. Remember that ports configured as high-level outputs can only be used as
outputs.
18 Digital488/80A Setup
Digital488/80A User's Manual
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