Wiring And Inputs/Outputs - Emerson Rosemount 3410 Series Installation Manual

Electrical installation
October 2023
3.5

Wiring and inputs/outputs

MeterLink uses the TCP/IP protocol to communicate with the Rosemount 3410 Series
Ultrasonic Gas Flow Meter electronics instead of Modbus ASCII or RTU. The TCP/IP protocol
only works across either Ethernet, RS-485 full duplex (4-wire) or RS-232. MeterLink can
communicate with multiple meters if they are multi-dropped using 4-wire, full duplex
RS-485 mode. The meter electronics is HART capable and provides communication
flexibility with Rosemount 3410 Series Gas Ultrasonic Flow Meters.
Note
Port B for RS-485 full duplex communication is not supported.
The HART
Communicator and AMS
diagnostic information through PlantWeb
NOTICE
If not using Ethernet, a full duplex serial connection is necessary for MeterLink to
communicate with a 3410 Series Gas Ultrasonic Meter.
The 3410 Series Gas Ultrasonic Flow Meter electronics auto-detects the protocol used
and automatically switches between TCP/IP, Modbus ASCII, and Modbus RTU so it is not
necessary to make any meter configuration changes to the protocol.
3.5.1 Central processing unit (CPU) Module labeling and LED
indicators
The meter's metrology mode and the status of the data transfer from the Acquisition
Module to the CPU Module are indicated via light-emitting diode (LED) status indicators.
The WRITE PROT. switch protects the meter's configuration.
Figure 3-7: CPU Module labeling and LED indicators - Type 2
A. Acquisition/Measurement mode
B. Power
C. LED 5: communication between CPU and acquisition module
D. LED 4: link between CPU and acquisition module
E. RX (RS-485/RS-232): receiving data
F. TX (RS-485/RS-232): transmitting data
G. Link (Ethernet 1 link): user Ethernet connection
(3) For RS-485 two-wire, use TX+ and TX-.
48
output provides communication with other field devices (e.g., Field
®
Device Manager software) and ultimately, communicates key
™
architecture.
®
(3)
Installation manual
00825-0600-3104
Gas Ultrasonic Flow Meters