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Digital Output Lines
TEMPpoint, VOLTpoint, and MEASURpoint instruments feature eight, latched and isolated
digital output lines. The outputs are solid-state relays that operate at ±30 V and 400 mA peak
(AC or DC). Switching time is 2 ms maximum.
Figure 31
shows the digital output circuitry.
Digital outputs resemble a switch; the switch is closed if the state of the digital output line is 1,
and the switch is open if the state of the digital output line is 0. On power up or reset, the
digital outputs are disabled.
Channel-to-Channel Isolation
Each TEMPpoint, VOLTpoint, and MEASURpoint instrument includes channel-to-channel
isolation of up to 250 V between digital I/O lines. If you require greater channel-to-channel
isolation, use every other digital line. This reduces the number of digital I/O lines, but
provides channel-to-channel isolation of 500 V (one channel can be +250 V while the adjacent
channel can be –250 V).
Resolution
Each TEMPpoint, VOLTpoint, and MEASURpoint instrument provides 8 bits of resolution for
the digital input port to accommodate the 8 digital input lines and 8 bits of resolution for the
digital output port to accommodate the 8 digital output lines. These lines are organized as
isolated, dedicated ports. You cannot configure port resolution through software.
Operation Modes
Using software, you can read from a single digital input line or the entire digital input port, or
write to a single digital output line or the entire digital output port. You can also return the
value of the entire digital input port in the analog input data stream if you want to correlate
analog input data with digital events; refer to
1 of 8 Solid State Relays
Figure 31: Digital Output Circuitry
page 92
for more information.
Principles of Operation
97
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