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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 PT.

5-1 Connecting to the Host’s RS-232C Port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

5-1-1 The Type of Host and Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

5-1-2 1:1 Connection between RS-422A/485 at the PT and

RS-232C at the Host . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

5-1-3 1:N Connection between RS-422A/485 at the PT and

RS-232C at the Host . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

5-1-4 Recommended Connectors, Cables, and Crimp Terminals . . . . . . . 92

5-1-5 Setting the Terminal Resistance for RS-422A/485 Communications 93

5-2 Connecting to the Host’s RS-422A/485 Port . . . . . . . . . . . . . . . . . . . . . . . . . 94

5-2-1 Host Types and Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

5-2-2 Direct Connection between RS-422A Ports at Both Units . . . . . . . 116

5-2-3 Direct Connection between RS-485 Ports at Both Units . . . . . . . . . 119

5-2-4 1:N Connection among RS-422A Ports. . . . . . . . . . . . . . . . . . . . . . 121

5-2-5 1:N Connection among RS-485 Ports . . . . . . . . . . . . . . . . . . . . . . . 124

5-2-6 Recommended Connectors, Cables and Crimp Terminals. . . . . . . . 126

5-2-7 Setting the Terminal Resistance for RS-422A/485 Communications 127

5-2-8 Handling the Shield on RS-422A/485 Cables . . . . . . . . . . . . . . . . . 128

Omron NT31 Setup Manual

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