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Daniel 3818 LNG Liquid Ultrasonic Meter Installation Manual Section 3: Electrical installation
3-9000-771 Rev A May 2012
Wiring and I/O 41
3.5 Wiring and I/O
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.