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Electrical Installation
January 2023
Figure 3-3: CPU Module labeling and LED indicators
A. Acquisition/Measurement mode
B. Power
C. RX (RS-485/RS-232) - receiving data
D. LED 4 - not used
E. LED 5 - not used
F. TX (RS-485/RS-232) - transmitting data
G. Link (Eth1 Link) - user Ethernet connection
Table 3-2: CPU Module labeling and LED functions
CPU Module labeling and
LED functions
WRITE PROT.
48
Function
•
Write-protect mode -
with switch in the ON
position (default setting)
protects configuration
and firmware overwrites.
•
To write configuration
changes or download
firmware to the meter,
change the switch to the
OFF position.
Rosemount 3812 Liquid Ultrasonic Flow Meter
Installation manual
00825-0100-3812
Switch position indicator
or LED
Switch position
•
ON - (default setting)
enables writeprotection
of the configuration and
firmware
•
OFF - enables writing
configuration changes or
downloading firmware
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