Macurco DVP-120 User Instructions page 12

DVP-120M
The Macurco MRS-485 Adapter converts the Macurco 6-Series 4-20mA analog output to a digital output for use with the DVP-120M
and other addressable network systems
1. Remove the 4-20mA/Power plug from the Macurco 6-Serires 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.
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.
DIP Switches and Addressing
Each MRS-485 (and the partner gas detector) must be configured to a unique address. If there are 10 detectors on the serial line, then
10 unique addresses must be used, one for each detector. To set the address use the eight DIP switch positions. For each unit choose
the value from 1 to 247 (see chart) and set the eight switches to match the address. UP means ON or 1 and DOWN means OFF or 0.
12