The digital input word, from pins 5 through 12 on the input/output connector, is updated with each conversion in polled
mode and with each packet of ten conversions in normal scanning mode. For digital input scanning, the digital input byte is updated and
transmitted once per conversion. The digital inputs are active low. They can be activated by a contact closure to digital ground or by
any 5 volt logic signal referenced to the same ground.The digital input word is displayed as an integer between 0 and 255. You may
want to view it in binary format so that individual inputs show as ones and zeros.
The digital output command puts a latched 8-bit digital word at pins 18 through 25 on the input/output connector. Valid values are in the
range of 0 to 255. The digital outputs are buffered to source or sink 20mA. Note that when sinking current, the voltage may rise significantly
above 0 volts.
25-PIN CONNECTOR PINOUT
PIN 13
|
Digital Ground
|
|
|
|
|
PIN 25
|
Digital Out 7
|
PIN 12
|
Digital In 0
|
|
|
|
|
PIN 24
|
Digital Out 6
|
PIN 11
|
Digital In 1
|
|
|
|
|
PIN 23
|
Digital Out 5
|
PIN 10
|
Digital In 2
|
|
|
|
|
PIN 22
|
Digital Out 4
|
PIN 9
|
Digital In 3
|
|
|
|
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PIN 21
|
Digital Out 3
|
PIN 8
|
Digital In 4
|
|
|
|
|
PIN 20
|
Digital Out 2
|
PIN 7
|
Digital In 5
|
|
|
|
|
PIN 19
|
Digital Out 1
|
PIN 6
|
Digital In 6
|
|
|
|
|
PIN 18
|
Digital Out 0
|
PIN 5
|
Digital In 7
|
|
|
|
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PIN 17
|
Digital Ground
|
PIN 4
|
Digital Ground
|
|
|
|
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PIN 16
|
Analog Ground
|
PIN 3
|
Analog Ground
|
|
|
|
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PIN 15
|
CHANNEL 1+
|
PIN 2
|
CHANNEL 1-
|
|
|
|
|
PIN 14
|
CHANNEL 0+
|
PIN 1
|
CHANNEL 0-
|
|
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|
|
Note: For maximum protection, any unused input terminals should be connected to ground. This is done to protect
the circuitry from static discharges which can be of extremely high voltage. Open inputs can also pick up noise.
Strain-relief is recommended for all permanent wiring on the connector. Otherwise, physical stress may cause the
failure of an electrical connection. The connector hood provided has a strain-relief clamp.
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