Installation, Operation and Maintenance Manual
MDE 254 Rev. 1 March 2021
Communication Features 3
Section 3: Communication Features
Section 3: Communication Features
Communication Protocol: HART Protocol Revision 7.2
Electrical Interface: 4 - 20 mA analog loop, 2 wire communication
HART Signal: Digital FSK Frequency Shift Keying (Bell 202 standard)
Logical “0” frequency: 2,200 Hz
Logical “1” frequency: 1,200 Hz
Data Rate: Request / response mode – 2/3 updates per second
Optional burst mode – 3/4 updates per second
Data Transmission: Master / Slave and Burst communication modes
Data Byte Structure: 1 start bit, 8 data bits, 1 odd parity bit, 1 stop bit
Command Structure:
Type of Command Structure
Universal Common to all devices
Common practice Optional; used by many devices
Device specific For unique product features
HART Topology: Point to point, Multidrop, Series Connection
Cable Lengths: Maximum twisted pair length — 10,000 ft. (3,048 m)
Maximum multiple twisted pair length — 5,000 ft. (1,524 m)
Electrical Power: Bus powered
Max voltage 36 V
Min voltage 0 V
Device Type: Actuator
Device Impedance: Low Impedance
Temperature: -40 °C, +85 °C
Reversed Polarity Protection: Present
EMC Protections: According to generic standard for industrial environments
EN61000-6-2 and EN 61000-6-4
Manufacturer ID Code: 183 (B7 HEX)
Device Type Code: 126 (7E HEX)
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