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
with the longest cable run.
4.7.10
External HART
®
devices (slaves)
The HART to Modbus
®
Converter (HMC) supports up to four external HART devices. The
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.
Table 4-4: Approximate Update Rates for Measurement Values
No. of devices (slaves) Approx. update rate
1 2 seconds
2 3 seconds
3 4 seconds
4 5 seconds
5 5 seconds
Electrical installation Reference Manual
April 2019 00809-0100-4530
104 Rosemount 5300 Level Transmitter
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