Rosemount Model 8800C Vortex Flowmeter
3-18
Figure 3-2 shows a typical multidrop network. This figure is not
intended as an installation diagram. Contact Rosemount product
support with specific requirements for multidrop applications.
Figure 3-2. Typical Multidrop Network
NOTE
The Model 8800C is set to poll address zero at the factory, allowing it to
operate in the standard point-to-point manner with a 4–20 mA output
signal. To activate multidrop communication, the transmitter poll
address must be changed to a number between 1 and 15. This change
deactivates the 4–20 mA analog output, setting it to 4 mA, and disables
the failure mode alarm signal.
Poll Address
Poll Address enables you to set the poll address for a multi-dropped
meter. The poll address is used to identify each meter on the multi-drop
line. Follow the on-screen instructions to set the address at a number
from 1 to 15. To set or change the flowmeter address, establish
communication with the selected Model 8800C in the loop.
Auto Poll
When a HART-based communicator is powered up and auto polling is
on, the communicator automatically polls the flowmeter addresses to
which it is connected. If the address is 0, the HART-based
communicator enters its normal online mode. If it detects an address
other than 0, the communicator finds each device in the loop and lists
them by poll address and tag. Scroll through the list and select the
meter with which you need to communicate.
3051-0087B
RS-232-C
Bell 202
Modem
Power
Supply
HART Comm. 1, 4, 3, 3, 1
HART Comm. OFF LINE FCN
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