Emerson Series 3000 MVD Manuel D’Utilisation
Configuration and Use Manual
17
Digital Communications Setup
Installation
Using the
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Begin
2. Using twisted-pair shielded cable, and a signal converter if required, connect the remote device
to the RS-485 output terminals on the Series 3000 device. Maximum cable length between the
Series 3000 and remote device is 4000 feet (1200 meters).
Series 3000 and remote device is 4000 feet (1200 meters).
•
Model 3300 or Model 3500 with screw-type or solder-tail terminals: see Figure 3-1
•
Model 3300 or Model 3500 with I/O cables: see Figure 3-2
•
Model 3350 or Model 3700: see Figure 3-3
3. Add resistance if required.
4. Configure RS-485 communications as described in Section 13.3.
Figure 3-1
Model 3300 or Model 3500 with RS-485 signal converter – Screw-type or solder-tail connectors
RS-485 to RS-232
signal converter
RS-485 A
RS-485 B
Wire size is 24 AWG (0,25 mm
2
)
For long-distance communication, or if noise from an
external source interferes with the signal, install a 120
external source interferes with the signal, install a 120
Ω,
½ watt resistor at each end of the wiring loop between the
Series 3000 device and the signal converter
Series 3000 device and the signal converter
Remote
device
Serial port connection
(with 9-pin to 25-pin
adapter if necessary)
(with 9-pin to 25-pin
adapter if necessary)
Input/output terminal block