ProSoft Technology ProTalk PTQ-104C Instruções de Operação descarregar pdf (Página 52)

PTQ-MCM ♦ Quantum / Unity Platform Setting Up the ProTalk Module

Modbus Communication Module

Page 52 of 139 ProSoft Technology, Inc.

April 29, 2008

RS-485

The RS-485 interface requires a single two or three wire cable. The Common

connection is optional and dependent on the RS-485 network. The cable required

for this interface is shown below:

Note: Terminating resistors are generally not required on the RS-485 network, unless you are

experiencing communication problems that can be attributed to signal echoes or reflections. In this

case, install a 120 ohm terminating resistor on the RS-485 line.

RS-422

RS-485 and RS-422 Tip

If communication in the RS-422/RS-485 mode does not work at first, despite all

attempts, try switching termination polarities. Some manufacturers interpret +/-

and A/B polarities differently.

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ProSoft Technology ProTalk PTQ-104C Instruções de Operação Página 52