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Cabling the LX Series

451-0308

Modem Control/Hardware Flow Control

LX Series serial ports can be set up to support RTS/CTS flow control. The

adapters shown in Figure 22 and Figure 23 illustrate RTS/CTS flow

control for DTE devices using DB25 and DB9 connectors. Figure 24

illustrates RTS/CTS flow control for a DB-25 connector on a DCE device

like a modem. LX Series serial ports can also be set up to support modem

control (except for the DIAG port (port 0)). Figures 22, 23, and 24 support

modem control as needed. Only Figures 23 and 24 support concurrent

modem control and RTS/CTS flow control between the LX Serial Port and

the attached device.

The adapter shown in Figure 24 supports modem control.

NOTE: You would use a "null-modem" cable when making a direct

connection between the serial ports of two communication servers

(i.e., no modems involved) or other DTE device. For that

application, use a DTE-to-DTE cable.

RJ-45 Wiring Considerations

You should give special consideration to the wiring scheme when

connecting a device such as a terminal to a LX Series serial port. The LX

Series is considered a DTE device. To connect to another DTE device such

as a terminal, you will need crossover wiring, as shown in Figure 22 and

Figure 23. When a DCE device is connected to an LX Series serial port,

straight-through wiring is required, as shown in Figure 24.

NOTE: In general, an ethernet CAT3/CAT5 may introduce noise due to the

crossing of pins 3 and 6 (transmit and receive). Flat eight wire

cables are recommended.

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MRV Communications AE092FCAKA Spezifikationen Seite 60