Macurco DVP-120C Manual
REV – 1.0
[34-8708-4770-8 ]
17
|
P a g e
Power connections to Macurco sensors used with the DVP-120C are polarity-insensitive (no polarity) since a bridge
rectifier is connected to the power input terminals. All sensors used with the DVP-120C panel employ screw clamp
terminal blocks for power and signal connections. The polarity of the current loop connections is marked on the
printed circuit board of the sensor.
The Macurco MRS-485 Adapter converts the Macurco 6-Series 4-20mA analog output to a digital output for use with
the DVP-120C and other addressable network systems.
1.
Remove the 4-20mA/Power plug from the Macurco 6-Series gas detector
2.
Plug the MRS-485 adapter into the empty socket.
3.
Install the provided MRS-485 screw.
4.
See the wiring diagram for wire connection.
Figure 3-9 MRS-485 Installation
3.2.6.1
Connection
The Macurco MRS-485 output is connected via a four-terminal screw type connector. The MRS-485 adapter is wired
in the standard 2W-Modbus circuit definition with selectable built-in terminating resistors at the ends of the RS-485
bus. The power for the MRS-485 adapter is connected via a two-terminal screw type connector, 12 to 24 VAC or 12
to 24 VDC and no polarity.
Note
: Running the Modbus cable adjacent to or in the same conduit with high voltage wires is not recommended as
there may be interference from the high voltages.
