Digi 9XCite-PKG Manual descargar pdf (Pagina 11)

9XCite™RS‐232/485RFModem–ProductManualv2.1[2007.01.04]

©2007MaxStream,Inc. 11

Figure2‐14. XCiteRFModeminanRS‐422environmen t

RS-485/422 Connection Guidelines

The RS-485/422 protocol provides a solution for wired communications that can tolerate high

noise and push signals over long cable lengths. RS-485/422 signals can communicate as far as

4000 feet (1200 m). RS-232 signals are suitable for cable distances up to 100 feet (30.5 m).

RS-485 offers multi-drop capability in which up to 32 nodes can be connected. The RS-422 proto-

col is used for point-to-point communications.

Suggestions for integrating the XCite RF Modem with the RS-485/422 protocol:

Figure2‐15. MaleDB‐9toRJ‐45Adapter(yellow)

Figure2‐16. FemaleDB‐9toRJ‐45Adapter(green)

An XCite RS-232/485 RF Modem ‘Accessories Kit’ is available that includes connectors that facilitate

RS-485/422 and other serial communications.

1. When using Ethernet twisted pair cabling: Select wires so that T+ and T- are connected to

each wire in a twisted pair. Likewise, select wires so that R+ and R- are connected to a

twisted pair. (For example, tie the green and white/green wires to T+ and T-.)

2. For straight-through Ethernet cable (not cross-over cable) - The following wiring pattern

works well: Pin3 to T+, Pin4 to R+, Pin5 to R-, Pin6 to T-

3. Note that the connecting cable only requires 4 wires (even though there are 8 wires).

4. When using phone cabling (RJ-11) - Pin2 in the cable maps to Pin3 on opposite end of

cable and Pin1 maps to Pin4 respectively.

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Digi 9XCite-PKG Manual Pagina 11