Specifications

Custom EU
Conversions
See “Creating and Loading Custom EU Conversion Tables” on page 96.
Linking Output
Channels to
Functions
Analog outputs are implemented either by a VT1531A or VT1537A Voltage Output
SCP or a VT1532A Current Output SCP. Channels where these SCPs are installed
are automatically considered outputs. No SOURce:FUNCtion command is required
since the VT1531A and VT1537A can only output voltage, while the VT1532A can
only output current. The only way to control the output amplitude of these SCPs is
through the VT1419A’s Algorithm Language.
Setting Up Digital Input and Output Channels
Setting Up Digital
Inputs
Digital inputs can be configured for polarity and depending on the SCP model, a
selection of input functions as well. The following discussion will explain which
functions are available with a particular Digital I/O SCP model. For Digital SCPs
whose data direction is programmable, setting a digital channel’s input function
is
what defines it as an input channel. The VT1536A Isolated Digital I/O SCP’s data
direction is set by configuration switches so the SENSe:FUNCtion and
SOURce:FUNCtion commands do not apply.
Setting Input Polarity To specify the input polarity (logical sense) for digital channels use the command
INPut:POLarity <mode>,(@<ch_list>). This capability is available on all digital
SCP models. This setting is valid even while the specified channel in not an input
channel. If and when the channel is configured for input (an input FUNCtion
command), the setting will be in effect. For the VT1536A the INP:POL command is
disallowed for output channels.
·
The <mode> parameter can be either NORMal or INVerted. When set to
NORM, an input channel with 3 V applied will return a logical 1. When set
to INV, a channel with 3 V applied will return a logic 0.
·
The <ch_list> parameter specifies the channels to configure. The VT1533A
has two channels of 8 bits each. All 8 bits in a channel take on the
configuration specified for the channel. The VT1534A has 8 I/O bits that
are individually configured as channels.
To configure the lower 8-bit channel of a VT1533A for inverted polarity:
INP:POLARITY INV,(@156) SCP in SCP position 7
To configure the lower 4 bits of a VT1534A for inverted polarity:
INP:POL INV,(@148:151) SCP in SCP position 6
Programming the VT1419A Multifunction
Plus
Setting Up Digital Input and Output Channels
66 Chapter 3
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