Configuring The Rear Connector For Parallel Mode; Configuring The Rear Connector For Serial Mode - National Instruments SCXI-1162HV User Manual

32-channel isolated ac/dc digital input module

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Configuration and Installation

Configuring the Rear Connector for Parallel Mode

When the rear connector is configured for parallel mode, the data from each input is sent directly

to a rear connector pin. You do not need serial communication with the SCXI chassis or

modules to read the data when the module is in parallel mode. This mode may be useful when

you want to send data from the SCXI-1162HV directly to equipment other than a DAQ board.

When the SCXI-1162HV is configured for parallel mode, a DAQ board cabled to the module can

only read from that module; communication with the SCXI chassis or other modules in that

chassis must be through another DAQ board. Only DIO DAQ boards can read the data from the

SCXI-1162HV in parallel mode; MIO boards can only read from the SCXI-1162HV in serial

mode.

When you configure the SCXI-1162HV for parallel mode, the module can drive either all

32 digital lines of the rear connector or only the first 24 lines. When you cable a DIO -24 or the

DIO portion of an AT-MIO-16D to an SCXI-1162HV in parallel mode, the SCXI-1162HV must

be configured to drive only 24 of the rear connector lines, because the DIO-24 and the

AT-MIO-16D only have 24 digital inputs. Do not attempt to connect the SCXI-1162HV to a

DIO-24 or an AT-MIO-16D with the module configured to drive all 32 lines in parallel, as this

may cause driver contention.

Note: When the rear connector is configured for parallel mode, the data can still be read in

serial mode through the SCXIbus connector. The jumper set configuration only

affects the rear signal connector; no other module functionality is affected by the

jumper positions.

When the rear connector is configured for serial mode, there is a serial data link between the rear

connector and the SCXIbus. This lets a DAQ board cabled to the rear connector communicate

with the SCXI-1162HV and with all other modules in the chassis. This is the recommended

mode of operation because you only need one DAQ board for an entire SCXI system.

When the SCXI-1162HV is configured for serial mode, only digital data is transferred between

the SCXIbus and the rear signal connector. Thus, in a mixed system of analog modules and

digital modules, the DAQ board must be cabled to an analog module. If the DAQ board were

cabled to a digital module such as the SCXI-1162HV, the analog signals from analog modules

could not reach the DAQ board.

SCXI-1162HV User Manual

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Chapter 2

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