Specifications

ProLinx Communication Gateways, Inc. 78
HART Master Protocol Drive Manual
August 17, 2004
Connections for HART Devices (Types A, B, C and D)
The ProLinx HART interface card has power supply input terminals for powering the
devices in a network. This external power supply must be properly sized to supply
current to all the HART devices in the network. A good rule of thumb is that each HART
device may require as much as 20mA. Therefore, if you plan to place 10 HART devices
in a network, you must provide a 24VDC power supply that can supply at least 200mA of
output current.
WARNING: Whenever the HART module is used in multi-drop mode (2 to 15
instruments per channel), each of the instruments 4 to 20mA analog signal is lost.
ProLinx HART Connection Diagram for Multiple Loop Powered Devices,
Digital Signal Only
(A, B, or D types)
15 devices maximum per
channel of any A, B or D
Type
POWER CHANNEL CHANNEL CHANNEL CHANNEL
1 2 3 4
+- +-+-+-+-
24V
Power
Supply