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4-2 Point IO™ 2/4 Channel Analog HART Module

User’s Manual Pub. 0300257-01 Rev. A

To determine if a HART device is present on a given channel the module will

continuously send out HART command 0 if the channel is enabled for HART. Short

frame addressing is used on command 0 and the polling address will be incremented in

the following manner:

0,1-15,16-63, 0

Once the module receives a reply to command 0 it will start its connection sequence to

populate its internal cache of device data for that channel and then proceed to scanning of

the dynamic variables and processing pass-through requests. The data acquisition

process is described in the flow chart shown on the following page.

Figure 4-1

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Spectrum-controls 1734sc-IE2CH Bedienungsanleitung Seite 42