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SECTION 5

Connecting to the Host from the RS-422A/485 Port

This section describes the method for connecting to the host using the RS-422A/485 port of the NT31/NT31C.

5-1 Connecting to the Host’s RS-232C Port 94. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-1-1 The type of host and settings 95. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-1-2 1:1 Connection between RS-422A/485 at the NT31/NT31C and RS-232C at the Host 97

5-1-3 1:N Connection between RS-422A/485 at the NT31/NT31C and RS-232C at the Host 102

5-1-4 Recommended Connectors, Cables, and Crimp Terminals 108. . . . . . . . . . . . . . . . . . . . . . .

5-1-5 Setting the Terminal Resistance for RS–422A/485 Communications 110. . . . . . . . . . . . . .

5-2 Connecting to the Host’s RS-422A/485 Port 111. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-2-1 Host Types and Settings 112. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-2-2 Direct Connection between RS-422A Ports at Both Units 131. . . . . . . . . . . . . . . . . . . . . . .

5-2-3 Direct Connection between RS-485 Ports at Both Units 136. . . . . . . . . . . . . . . . . . . . . . . . .

5-2-4 1:N Connection among RS-422A Ports 137. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-2-5 1:N Connection among RS-485 Ports 140. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-2-6 Recommended Connectors, Cables and Crimp Terminals 143. . . . . . . . . . . . . . . . . . . . . . .

5-2-7 Setting the Terminal Resistance for RS–422A/485 Communications 144. . . . . . . . . . . . . .

Omron NT31 User Manual

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