Spectrum Controls 1734sc-IE2CH - Manual (Page 42)

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