4-18 Chapter 4: Appendix D - RS-485/422 Option
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.
Intellicon-NT960/PCI User's Manual, ver. 0.02