Connect Tech NT960/PCI User Manual download pdf (Page 70)

4-18 Chapter 4: Appendix D - RS-485/422 Option

Intellicon-NT960/PCI User's Manual, ver. 0.02

DIP switches S1, S2, S3, and S4 on the RS-485/422 SLIM allow

you to select a "generator station" load and a "receiver station"

load. The "generator station" is either the TxD or RTS signals.

The "receiver station" is either the RxD or CTS signals.

The RS-485 SLIM also offers you the additional functionality to

disconnect the RxD signal pair COMPLETELY from the load and

bias circuits. This allows you to "multi-drop" the RxD station on a

half duplex communication line. You select this option with

switch positions 3 and 4 on switch blocks S1, S2, S3, and S4.

Please refer to the following examples concerning this option and

their switch settings.

Examples:

1. The following example shows the RxD signal pairs on a

ACM/Flex16 port disconnected from the load and bias

circuits for multi-drop on a half duplex line.

switch blocks

S1, S2, S3, or S4

2. The following example shows the RxD signal pairs on a

ACM/Flex16 port connected to the load and bias circuits.

switch blocks

S1, S2, S3, or S4

Switch positions 1 and 2 on switch blocks S1, S2, S3 and S4

allow the "generator stations" (TxD and RTS) to have either no

load or a DC load of 150 ohms. Please refer to the examples

following for these configuration options and their switch settings.

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Connect Tech NT960/PCI User Manual Page 70