Rockwell-automation 2711 MODBUS COMMUNICATIONS FOR PANELVIEW TERMINALS Manual de usuario descargar pdf (Pagina 6)

Publication 2711-6.9 - March 2000

6 Modbus Communications for PanelView Terminals

Making Modbus

Connections

The PanelView Modbus protocol communicates with other devices

over an RS-232 (point-to-point) or RS-485/RS-422 (multi-drop) serial

link. Refer to the following pinout information to connect the

PanelView to a Modbus network.

Important: Follow the Modbus network layout and design as

specified by the user manual for your programmable controller.

Line Termination

The device at each end of an RS-485/422 network should be

terminated. A termination switch is provided on the PanelView (see

figure above). Enabling line termination provides an RC line

termination of .01mF and 120

Ω. Do not use line termination for RS-232

communications. Do not terminate devices between the network

ends.

ATTENTION

Use a nonconducting probe to change the line

termination switch. Do not use a graphite pencil or

other conductive material. Failure to use a

nonconducting tool, may result in damage to the

PanelView.

PanelView

Refer to next page for a

description of pinout connections.

OFF = termination is off

ON = line terminated

Line Termination

DIP Switch for RS-485/422

OFF

PanelView Modbus Connector

Not Used

1 2 3 4 5 6 7 8 9 10 11 ... 23 24

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Rockwell-automation 2711 MODBUS COMMUNICATIONS FOR PANELVIEW TERMINALS Manual de usuario Pagina 6