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178

Reference Manual

00809-0100-4811, Rev DA

Appendix C: Rosemount 3300 Series with HART

to Modbus

Converter

January 2015

Rosemount 3300 Series with HART

to Modbus

Converter

C.2 Introduction

The Rosemount 3300 Series Transmitter is a Modbus compatible measurement device that

supports communication with a Remote Terminal Unit (RTU) using a subset of read, write, and

diagnostic commands used by most Modbus-compatible host controllers. The transmitter also

supports communication through Levelmaster and Modbus ASCII protocols.

The HART to Modbus Converter (HMC) module is located inside the Rosemount 3300

transmitter enclosure and provides power to and communicates with the transmitter through a

HART interface.

Failure to follow safe installation and service guidelines could result in death or

serious injury.

 Make sure the transmitter is installed by qualified personnel and in accordance with

applicable code of practice.

 Use the equipment only as specified in this manual. Failure to do so may impair the

protection provided by the equipment.

 Do not perform any services other than those contained in this manual unless you are

qualified.

Explosions could result in death or serious injury.

 Verify that the operating environment of the transmitter is consistent with the

appropriate hazardous locations specifications.

 To prevent ignition of flammable or combustible atmospheres, disconnect power

before servicing.

 Before connecting a HART

- based communicator in an explosive atmosphere, make

sure the instruments in the loop are installed in accordance with intrinsically safe or

non-incendive field wiring practices.

 To avoid process leaks, only use O-ring designed to seal with the corresponding flange

adapter.

Electrical shock can result in death or serious injury.

 Avoid contact with the leads and terminals. High voltage that may be present on leads

can cause electrical shock.

 Make sure the main power to the Rosemount 3300 Series Transmitter is off and the

lines to any other external power source are disconnected or not powered while

wiring the transmitter.

Probes with non-conducting surfaces

 Probes covered with plastic and/or with plastic discs may generate an ignition-capable

level of electrostatic charge under certain extreme conditions. Therefore, when the

probe is used in a potentially explosive atmosphere, appropriate measures must be

taken to prevent electrostatic discharge.

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