Hart; To Modbus ® Converter (Hmc) - Emerson 5301HxxxxxxxxxxxxxxZZ Series Reference Manual

Reference Manual
00809-0100-4530
For flameproof/explosion-proof applications the resistance between the negative terminal
on the transmitter and the power supply must not exceed 435 Ω.
Note
For flameproof/explosion-proof installations, make sure the transmitter is grounded to the
internal ground terminal inside the terminal compartment in accordance with national
and local electrical codes.
Note
For intrinsically safe installations, make sure the instruments in the loop are installed in
accordance with intrinsically safe field wiring practices and system control drawings when
applicable.
4.7

HART

4.7.1 External power supply
The input voltage U
4.7.2 Signal wiring
For the RS-485 bus, use shielded twisted pair wiring, preferably with an impedance of 120
Ω (typically 24 AWG) in order to comply with the EIA-485 standard and EMC regulations.
The maximum cable length is 4000 ft./1200 m.
4.7.3 Power supply cabling
The power supply cables must be suitable for the supply voltage and ambient
temperature, and approved for use in hazardous areas, where applicable.
4.7.4 Ground (common mode) voltage limit
± 7 V
4.7.5 Bus termination
Standard RS-485 bus termination per EIA-485
4.7.6 Connection terminals
The connection terminals are described in
Table 4-3: Connection Terminals
Connector label
HART +
HART -
Reference Manual
® ®
to Modbus
for Modbus is 8-30 Vdc (max. rating).
i
Description
Positive HART connector
Negative HART connector
converter (HMC)
Table 4-3.
Comment
Connect to PC with Rosemount
Radar Master software,
handheld communicator, or
other HART configurators.
Electrical installation
April 2019
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