Table 3-3: Ethernet cable to PC communication
Ethernet communication
Wire color CPU
White w/Orange Stripe TX+
Orange w/White Stripe TX -
White w/Green Stripe RX+
Green w/White Stripe RX -
A DIN 41612 48-pin connector is the interface from the CPU Module to the CPU
Module to the Field Connection Board (male end located on the back of the Field
Connection Board).
Serial connections
Use serial cable (P/N 3-2500-401) to connect to a PC running MeterLink. The cable
is designed for RS-232 communications which is the serial Port A default
configuration (see Engineering Drawings field wiring diagram, Drawing
DMC-004936). The DB-9 end of the cable plugs directly into the PC running
MeterLink. The three wires on the other end of the cable connect to the CPU
Module. The RED wire goes to RX, the WHITE wire goes to TX, and the BLACK wire
goes to COM for the RS-485/RS-232 treenails (Table 3-4 for Port A wiring).
When Belden wire No. 9940 or equivalent is used, the maximum cable length for
RS-232 communications at 9600 bps is 88.3 meters (250 ft.) and the maximum
cable length for RS-485 communication at 57600 bps is 600 meters (1970 ft.).
Port A supports a special override mode which forces the port to use known
communication values (19200 baud, address 32, RS-232). Note that the protocol is
auto-detected. This mode is expected to be used during meter commissioning (to
establish initial communication) and in the event that the user cannot
communicate with the meter (possibly due to an inadvertent communication
configuration change). Alternately, when using MeterLink
™
with an Ethernet port,
use Ethernet cable (P/N 1-360-01-596) to connect the PC.
Installation manual Electrical Installation
00825-0100-3814 January 2023
Rosemount 3814 Liquid Ultrasonic Flow Meter 51
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