Specifications

Reference HART ♦ ProLinx Gateway
Driver Manual HART Master
ProSoft Technology, Inc. Page 101 of 119
July 7, 2009
ProLinx HART Connection Diagram for Multiple Single and Loop-Powered
Devices, Digital Signal Only (A, B, C, or D Types)
This type of connection is NOT recommended, but has been used to mix A, B, C,
and D types of HART devices.
Note: This type of connection may have problems associated with the lowering of AC impedance,
lower immunity to electrical noise, and lower supply voltage to A and B type devices.
5.3.2 Example Field Terminations
Up to 15
instruments per
channel
One instrument per channel
Multi-drop Mode
(address 1 to 15)
Point to Point
Mode
(address 0 to 15)
Point to Point
Mode with
Analog
(address 0 only)
Power Mode A
24VDC connected
to HART power
terminals 1 and 2
on terminal block
Master Powered
instruments on all
4 channels
OK
Install 250Ω 1KΩ
OK
Install 1K resistor
OK
Loop Powered
instruments on 1
or more channels
OK OK OK
- differential or
single ended
analog signal
Power Mode B
HART power
terminals 1 and 2
on terminal block
left open
Self Powered
instruments on 1
or more channels
Not possible OK OK
-differential or
single ended
analog signal