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ROC800-Series Instruction Manual
4-24
Input/Output Modules
Revised Jul-14
Figure 4-30. MVS Jumper J4 (Shown Not Terminated)
Four wires run from the MVS module terminal block and connect to the
sensor. The wires should be a minimum size of 22 AWG and a
maximum length of 1220 m (4000 ft).
Note
:
Insulated, shielded, twisted-pair wiring is required when using
MVS signal lines.
Two of the terminal blocks provide power and the other two terminals
provide a communication path.
Table 4-5
identifies the terminals.
Table 4-4. MVS Signal Routing
Label
MVS
LED
Terminal
A
RX / TX +
Lit green when receiving
1
B
RX / TX –
N/A
2
None
No Connect
Lit green when transmitting
3
+
Sensor Power
N/A
4
–
Common
N/A
5
Note
:
Pay close attention to the connections; do not reverse the
power wires.
Make
these connections only
after removing
power
from the ROC800. Double-check connections for the
proper orientation before applying power. If the connections are
reversed and power is applied, you may damage
both
the MVS
module and the ROC800-Series processor board.
Caution
You can induce ground loops by tying commons from various modules
together.