Q08 : How To Integrate Active And Passive Hart Devices In Multi-Drop Network - ICP DAS USA HRT-710 User Manual

Modbus / HART Mapping Table), users can get the communication status of the User
CMD Index = 1.
Figure 7-3 The status of the User CMD Index = 0&1
In the Figure 7-3, the status of the User CMD Index = 1 is 0x02. It means that the HART
device for the User CMD Index = 1 is disconnected from HRT-710. (In the Figure 7-3, the
status of the User CMD Index = 0 is 0x00. It means that the HART device for the User
CMD Index = 0 is connected to HRT-710.)
Q08 : How to integrate Active and Passive HART devices in
multi-drop network ?
A07: (2013/12/06)
1. If there are more than 7 HART devices in the HART network, users need to disable the
internal resistor (250 Ohm, 1/4W) of HRT-710 (adjust JP4 to be pin2 and pin3, refer to the
section 2.6 for detailed). Then add the external resistor (250 Ohm, 1W) in HART network.
2. The HART wiring of the Active and Passive HART devices, please refer to the figure 8-1.
HRT-710 User Manual (Version 1.24, June/2015) PAGE: 87