Specifications

Setting Input Function Both the VT1533A Digital I/O SCP and VT1534A Frequency/Totalizer SCP can
input static digital states. The VT1534A Frequency/Totalizer SCP can also input
Frequency measurements and Totalize the occurrence of positive or negative digital
signal edges.
Static State (CONDition) Function
To configure digital channels to input static states, use the
[SENSe:]FUNCtion:CONDition (@<ch_list>) command. Examples:
To set the lower 8-bit channel of a VT1533A in SCP position 4 to input
SENS:FUNC:COND (@132)
To set the upper 4 channels (bits) of a VT1534A in SCP pos 5 to input states
SENS:FUNC:COND (@144:147)
Frequency Function
The frequency function uses two commands. For more on this VT1534A capability
see the SCP’s User’s Manual.
To set the frequency counting gate time execute:
[SENSe:]FREQuency:APERature <gate_time>,(@<ch_list>)
Sets the digital channel function to frequency
[SENSe:]FUNCtion:FREQuency (@<ch_list>)
Totalizer Function
The totalizer function uses two commands also. One sets the channel function and
the other sets the condition that will reset the totalizer count to zero. For more on
this VT1534A capability see the SCP’s User’s Manual.
To set the VT1534A’s totalize reset mode
[SENSe:]TOTalize:RESet:MODE INIT | TRIG,(@<ch_list>)
To configure VT1534A channels to the totalizer function
[SENSe:]FUNCtion:TOTalize (@<ch_list>)
Setting Up Digital
Outputs
Digital outputs can be configured for polarity, output drive type, and depending on
the SCP model, a selection of output functions as well. The following discussion
will explain which functions are available with a particular Digital I/O SCP model.
Setting a digital channel’s output function is what defines it as an output channel.
Programming the VT1419A Multifunction
Plus
Setting Up Digital Input and Output Channels
Chapter 3 67
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