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Digital In and Out

Use the following chart to find the location of the digital bits for your device.

 

Device Interface in Use Mux in Use?3 DigOut from High Byte?1 DigOut from Low Byte?5 DigIn to High Byte?5 DigIn to Low Byte?1
DI-145, DI-245, DI-1100 USB No No No No No
DI-148/149/155/158 USB No No Yes No Idle4
DI-154/194/195B Serial Port No No No No No
DI-200 ISA No No Yes No Idle
DI-200 ISA Yes No No No Idle
DI-220/221 Printer Port No No Yes No Yes
DI-220/221 Printer Port Yes No No No Idle
DI-4x0 ISA No No Yes No Yes
DI-700 USB No No Yes No Idle
DI-71x Ethernet No No Yes No Idle
DI-71x USB No No Yes No Idle
DI-7205-EN Ethernet No No No Primary Idle Expansion Idle
DI-720-EN Ethernet Yes No No Primary Idle Expansion Idle
DI-720-ENA Ethernet No Yes2 Yes Primary Idle Expansion Idle
DI-720-ENA Ethernet Yes No Yes Primary Idle Expansion Idle
DI-720-ENB Ethernet No Yes2 Yes Primary Idle Expansion Idle
DI-720-ENB Ethernet Yes No Yes Primary Idle Expansion Idle

DI-720-ENx

 Printer Port No Yes Yes Primary Expansion
DI-720-ENx Printer Port Yes No Yes Primary Expansion
DI-720-P Printer Port No Yes Yes Primary Expansion
DI-720-P Printer Port Yes No Yes Primary Expansion
DI-720-U Printer Port No Yes Yes6 Primary Expansion
DI-720-U Printer Port Yes No Yes6 Primary Expansion
DI-720-U USB No Yes No Primary Idle Expansion Idle
DI-720-U USB Yes No No Primary Idle Expansion Idle
DI-1110, DI-1120, DI-2008, DI-2108, DI-2108-P, DI-4108, DI-4208, DI-4718B, DI-4730 USB No No Yes No Idle
DI-1120, DI-2008, DI-2108,DI-2108-P, DI-4108, DI-4208, DI-4730 USB Yes No Yes7 No Idle

1. For the DI-720/722/730/740/750/760/785/788/500/510, "DigOut from High Byte" and "DigIn to Low byte" both connect to unlabeled expansion connector pins (via CABL-7, or the right front panel connector if available). Pins DI10 through DI15 go to data bits 2-7 of scanned data or DigitalInput return values, R. START/STOP goes to data bit 1, and EVNT goes to bit 0. Note the change in pinout with the following image.

2. Requires special firmware. Contact DATAQ Instruments for more information.

3. The "Mux" column should be "Y" if a DI-725 expander is connected, for DI-510/760 devices with more than 32 channels, or for older devices with Computer Boards multiplexers attached, but "N" if only DI-75B or DI-78B expanders are attached.

4. "Idle" means that the DigitalInput properties should not be examined while scanning, when they may obtained by adding a digital input channel to the scan list. However, when this is done for devices outside the DI-720 series, the digital inputs appear in the high byte (right-justified if there are fewer than eight), unlike their position in DigitalInput return values.

5. DI-722/730/740 users have no way to access the "DigOut Low byte" and "DigIn High Byte" pins buried inside the device. These devices work like the DI-720, except that these columns should be filled with "N".

6. Except for DO1, DO2, and DO3 which are unavailable.

7. For these devices digital out bits 8-11 specify relative device number of multiple devices. Bit 14 specifies digital output of D0-D2 to a device LED, or if Bit 15 is also set, bits 8-11 specify the relative device number for digital input from a device that is not scanning.

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