MZ-RD – Multi-Zone Remote Display
8 Instruction 3015-5157
A switch or circuit breaker rated 1.0 A, 250 VAC must be attached to the unit’s AC power leads.
This switch must also be located in close proximity to the monitor, and be in easy reach of the
operator. This switch should also be clearly marked as the monitor’s main AC disconnect
device.
2.7. Communications Connections
2.7.1 MZ-RD Network
The MZ-RD is connected to the gas monitor using a shielded twisted pair instrument cable. The
maximum distance between the furthest gas monitor and MZ-RD is 4500 feet (1372 m).
Use any of the remaining service knockouts to gain access to the interior of the unit. The RS-485
communication wiring between the gas monitor and MZ-RD must be connected in the following
manner:
1. Locate the RS-485 connector in the gas monitor (See appropriate gas monitor manual).
2. Connect one lead of a twisted shielded pair to the “B” connection point; note the wire
color.
3. Connect the second wire to the “A” connection point; note the wire color.
4. Connect the ground to the “GND” connection point
Locate the RS-485 connector marked “TO MONITORS” in the MZ-RD. This connector is located
on the bottom of the MZ-RD PC board, second from the right. Run the wire to the MZ-RD and
connect the twisted shielded pair to the RS-485 TO MONITORS connector using the same color
code as used on the gas monitor.
2.7.2 Integration with Building Management
System
A second RS-485 connector allows a Building
Management System to “talk” to the gas monitor
network through the MZ-RD. The connection is
established using a shielded twisted pair cable.
Use any of the remaining service knockouts to gain
access to the interior of the MZ-RD. Locate the RS-485
connector marked “TO HOST” and remove it from the
circuit board. Secure the wire leads to the connector in
the orientation as displayed on the board. Check to
make sure the polarity matches the wiring to the
Building Management System. When connections are
secured, carefully plug the conne
ctor back onto the
circuit board.
RS-485 to HOST Connector
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