Rosemount 4088A MultiVariable, Быстрый старт

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September 2016
10
Quick Start Guide
3. Slide the security and AC Termination switches into the preferred position by
using a small screwdriver. Note that the security switch will need to be in the
off position in order to make any configuration changes.
4. Reinstall the housing cover and tighten so that the cover is fully seated with
metal to metal contact between the housing and cover in order to meet
explosion proof requirements.
Figure 9. Transmitter Switch Configuration
A. Security B. AC termination
5.0 Wiring and power up
Use the following steps to wire the transmitter:
1. Remove the cover on the field terminals side of the housing.
2. Set up based on optional process temperature input.
a. If the optional process temperature input is being utilized, follow the
procedure “Install optional process temperature input (Pt 100 RTD Sensor)”
on page 13 .
b. If there will not be an optional temperature input, plug and seal the unused
conduit connection.
3. Connect the transmitter to the RS-485 bus as shown in Figure 10 .
a. Connect the A lead to the “A” terminal.
b. Connect the B lead to the “B” terminal.
4. Connect the positive lead from the power source to the “PWR +” terminal, and
the negative lead to the “PWR –” terminal.
Note
The Rosemount 4088 MultiVariable Transmitter uses RS-485 Modbus with 8 data bits, 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 feet (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.
A
B