Emerson 3-9000-771A User Manual

3-9000-771 Rev A

May 2012

Daniel MeterLink uses the TCP/IP protocol to communicate with the 3818 LNG Liquid Ultrasonic 
Flow Meter electronics instead of Modbus ASCII or RTU. The TCP/IP protocol only works across 
either Ethernet, RS-485 full duplex (i.e., 4-wire), or RS-232. Daniel 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 Daniel 3818 LNG Liquid 
Ultrasonic Flow Meters.

The HART® output provides communication with other field devices (e.g., Field Communicator 
and AMS™ Device Manager software) and ultimately, communicates key diagnostic information 
through PlantWeb® architecture.    

The Daniel 3818 LNG Liquid Ultrasonic Flow Meter has two 3814 electronics enclosures and 
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 change the 
protocol.

Two sets of transmitter electronics (co-located) are provided with the Daniel 3818 LNG Liquid 
Ultrasonic Flow Meter. The Primary (master) electronics are in the upstream enclosure with the 
serial tag marked _H1. The Secondary (slave) electronics are in the downstream enclosure with 
the serial tag marked _H2. 

If not using Ethernet, a full duplex serial connection is necessary for Daniel MeterLink to 
communicate with a Daniel 3818 Liquid Ultrasonic Meter.  

Note:

Daniel recommends running conduit and field wiring to each of the co-located Transmitter
 Electronics Enclosures and wiring each of the meters.