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Electrical Installation
May 2019
Table 3-2: CPU Module labeling and LED functions
CPU Module labeling and LED
functions
MEAS
PWR
LED 4
LED 5
RX
TX
LINK
Ethernet communications
The Ethernet port IP address, subnet mask, and gateway address are software-
configurable. In addition, a meter can be configured to act as a DHCP (Dynamic Host
Configuration Protocol) server to assign an IP address to a PC or laptop running Daniel
MeterLink. The DHCP server facility is not intended to act as a general purpose DHCP
server for a wider network. To this end, no user control is provided over the class or range
of IP addresses the unit provides. A standard twisted pair (Cat-5) cable should be used for
Ethernet wiring.
It is strongly recommended that the meter be configured using an independent (off-
network) single host. After configuration of the Daniel 3818 LNG Liquid Ultrasonic Flow
Meter, the DHCP option must be turned off if used on a LAN/WAN.
CAUTION
RESTRICT ETHERNET AND SERIAL CONNECTIVITY USAGE
User is responsible for ensuring that physical access and Ethernet or electronic access to
the Daniel 3818 LNG Liquid Ultrasonic Flow Meter is appropriately controlled and any
necessary security precautions, such as, establishing a firewall, setting password
permissions and/or implementing security levels.
Failure to restrict Ethernet and communication access to the Daniel 3818 LNG Liquid
Ultrasonic Flow Meter can result in, among other things, unauthorized access, system
corruption, and/or data loss.
48
(continued)
Function
System color indicates
metrology mode
•
Acquisition mode
•
Measurement mode
•
3.3V Power Indicator
•
Not used
•
Not used
•
RX signal (Port A for RS485
or RS232 communication)
receiving data
•
TX signal (Port A for RS485
or RS232 communication)
transmitting data
•
ETH1Link user Ethernet
connection
Installation manual
3-9000-771
Switch position indicator or
LED
LED status
•
Red flashing LED
•
Solid red the Acquisition
Module not communicating
with the CPU Module
•
Green flashing LED
•
Solid Green
•
Flashing green (when
receiving data)
•
Flashing green (when
transmitting data)
•
Solid green
3818 LNG Liquid Ultrasonic Meter
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