Specifications

Setting Output Polarity To specify the output polarity (logical sense) for digital channels use the command
OUTPut: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 output
channel. If and when the channel is configured for output (an output FUNCtion
command), the setting will be in effect.
·
The <mode> parameter can be either NORMal or INVerted. When set to
NORM, an output channel set to logic 0 will output a TTL compatible low.
When set to INV, an output channel set to logic 0 will output a TTL
compatible high.
·
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 eight I/O bits
that are individually configured as channels.
To configure the higher 8-bit channel of a VT1533A for inverted polarity:
OUTP:POLARITY INV,(@133) SCP in SCP position 4
To configure the upper 4 bits of a VT1534A for inverted polarity:
OUTP:POL INV,(@136:139) SCP in SCP position 4
Setting Output
Drive Type
The VT1533A and VT1534A use output drivers that can be configured as either
active or passive pull-up. To configure this, use the command
OUTPut:TYPE <mode>,(@<ch_list>). This setting is valid even while the specified
channel in not an output channel. If and when the channel is configured for output
(an output FUNCtion command), the setting will be in effect.
·
The <mode> parameter can be either ACTive or PASSive. When set to
ACT (the default), the output provides active pull-up. When set to PASS,
the output is pulled up by a resistor.
·
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 eight I/O bits
that are individually configured as channels.
To configure the higher 8-bit channel of a VT1533A for passive pull-up:
OUTP:TYPE PASS,(@156) SCP in SCP position 7
To configure the upper 4 bits of a VT1534A for active pull-up:
OUTP:TYPE ACT,(@148:155) SCP in SCP position 6
Programming the VT1419A Multifunction
Plus
Setting Up Digital Input and Output Channels
68 Chapter 3
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