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Quick Start Guide
5
Wiring and power up
Use the following steps to wire the transmitter:
Procedure
1. Remove the cover on the field terminals side of the housing.
2. Set up based on optional process temperature input.
3. Connect the Rosemount 4088A to the RS-485 bus as shown in
6-2.
4. Connect the positive lead from the power source to the "PWR +"
terminal, and the negative lead to the "PWR –" terminal (for power
requirements, reference ).
Note
The Rosemount 4088A uses RS-485 Modbus
one stop bit and no parity. The default baud rate is 9600.
Note
Twisted pair wiring is required for RS-485 bus wiring. Wiring runs
under 1000 ft (305 m) should be AWG 22 or larger. Wiring runs from
1000 to 4000 ft. (305 to 1219 m) should be AWG 20 or larger. Wiring
should not exceed AWG 16.
5. Ensure full contact with terminal block screw and washer. When
using a direct wiring method, wrap wire clockwise to ensure it is in
place when tightening the terminal block screw.
14
a) If the optional process temperature input is being utilized,
follow the procedure
input (Pt 100 RTD
b) If there will not be an optional process temperature input,
plug and seal the unused conduit connection.
NOTICE
When the enclosed threaded plug is utilized in the conduit
opening, it must be installed with a minimum engagement of
five threads in order to comply with explosion-proof
requirements. For straight threads, a minimum of six threads
must be engaged. For tapered threads, install the plug
wrench-tight.
a) Connect the A lead to the "A" terminal.
b) Connect the B lead to the "B" terminal.
Rosemount 4088A MultiVariable Transmitter Quick Start Guide
Install optional process temperature
Sensor).
April 2019
®
with eight data bits,
Figure
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