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18 Micro Motion
®
Series 3000 MVD Transmitters and Controllers
Digital Communications Setup
Figure 3-2 Model 3300 or Model 3500 with RS-485 signal converter – I/O cables
Figure 3-3 Model 3350 or Model 3700 with RS-485 signal converter
RS-485 to RS-232
signal converter
Remote
device
RS-485 A
RS-485 B
For long-distance communication, or if noise
from an 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
Wire size is 24 AWG (0,25 mm
2
)
Serial port connection
(with 9-pin to 25-pin
adapter if necessary)
Input/output terminal block
RS-485 B
RS-485 A
Wire size is 22 AWG (0,35 mm
2
)
For long-distance communication, or if noise from an
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
RS-485 to RS-232
signal converter
Remote
device
Serial port connection
(with 9-pin to 25-pin
adapter if necessary)
Input/output terminal block