Radiant, Inc.
11
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Step Four (Rev B Hardware):
Connect the HOST RS232 connector (See Figure 5) to a host PC serial port using a 6
conductor phone wire to the RJ12<->9 pin male/female adapter. Connection to the DB9
side requires only three wires for pins 2, 3, and 5.
RS485 Termination
Switch for CHAIN
Address Switch
(FF0-FFF)
Figure 5 – DVMD1 Rev B Rear Panel
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Step Five:
Set the Unit Address switch to “0” for single DVMD installations. All DVMD units are
mapped into the address range 0xFF0 to 0xFFF. The Unit Address rotary switch selects
the least significant digit (0-F). Turn the rotary switch to “0” to select Unit Address 0xFF0.
(See Figure 5) For systems with multiple DVMD units, chained together by the RS485
bus, each individual Unit Address switch must be set to a unique number from “0” to “F”.
The physical Unit Address must match the last digit entered in the “Unit Address” menu in
the user interface.
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Step Six:
The RS485 CHAIN switch must be terminated for the first and last units in the CHAIN. All
other DVMD1 termination switches must NOT be terminated. A six-conductor phone wire
may be used to connect from the CHAIN output of the first unit (FF0) to the next unit.
The REV A product has separated CHAIN inputs. The Rev B products use the HOST
connector for two functions: RS232 to the host, and as the CHAIN-IN connection for
subsequent units on the RS485 bus. The CHAIN cables may be up to 100 feet in length,
with a total length of 1000 feet. The CHAIN phone cables are crimped with the white wire
to the right with the tab up on both ends of the cable.
