ROC827 Instruction Manual

Figure 5-6. 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 5-16 identifies the terminals.

Table 5-16. MVS Signal Routing – Comm3, Comm4, and Comm5

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

Notes:

ƒPay close attention to the connections; do not reverse the power wires. Make these connections only after removing power from the ROC827. Double-check connections for the proper orientation before applying power. If the connections are reversed and power is applied, you will damage both the MVS module and the ROC800-Series processor board.

Issued Mar-06

Communications

5-15

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Image 107
Emerson ROC827 instruction manual MVS Jumper J4 Shown Not Terminated, MVS Signal Routing Comm3, Comm4, and Comm5