Emerson 5301HxxxxxxxxxxxxxxZZ Series Reference Manual page 104

Electrical installation
April 2019
Figure 4-12: Star Topology Connection of Rosemount 5300 Level Transmitters
A. For star topology connection, connect the 120 Ω termination resistor to the transmitter
4.7.10 External HART
The HART to Modbus
external devices are separated by using the HART address. The address must be different
between the external devices and only addresses 1 to 5 are allowed for multiple slaves.
Connect the devices one at a time and change the short address prior to connecting the
next device by using a HART Configuration Tool such as Rosemount Radar Master, or a
handheld communicator.
Note
The power supply from the HMC to external HART devices is not intrinsically safe. In a
hazardous environment, any external HART device connected to the HMC must have
Flameproof/Explosion-proof certification.
The HMC cyclically polls the HART devices for measurement values. The update rate
depends on the number of connected devices and is shown in
Table 4-4: Approximate Update Rates for Measurement Values
No. of devices (slaves)
1
2
3
4
5
104
with the longest cable run.
®
devices (slaves)
®
Converter (HMC) supports up to four external HART devices. The
Table 4-4.
Approx. update rate
2 seconds
3 seconds
4 seconds
5 seconds
5 seconds
Rosemount 5300 Level Transmitter
Reference Manual
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