RAD Data comm LRS-24 operation manual RS-232 Supervisory Port Interface Characteristics

LRS-24Installation and Operation Manual Chapter 4 Management via the CM-2 Module

Modules must be initialized properly to ensure correct terminal operation, as explained in Section 4.4; otherwise, some of the commands may not work properly.

RS-232 Supervisory Port Interface Characteristics

The CM-2 module has an RS-232 asynchronous DCE port, designated Management RS-232. This port has a 9-pin D-type female connector, which enables direct connection to terminals. Since terminals usually have DTE interfaces, their connection is made by means of a straight-through cable. For connection to a modem, use a cross cable (also called a null modem cable). For detailed instructions on connecting terminals, see below.

The control lines that are used, and directions for connections are listed in Appendix A.

The data transfer characteristics are as follows.

Default data rate: 38.4 kbps

Default word format: 1 start bit, 8 data bits, no parity, 1 stop bit

Terminal Connection Methods

This section presents typical methods for the connection of a supervision terminal to the CM-2 module installed in the LRS-24 unit.

Connection of Supervision Terminal

A supervision terminal can be connected either directly to the supervisory port, or through a modem or any other type of full-duplex data link. The CM-2 module supports unrestricted dial-in and only major alarms in dial-out.

Figure 4-1, Figure 4-2,and Figure 4-3show typical connections. Note that the cable used to connect directly to the terminal is a straight-through cable, whereas the connection to the modem requires a cross-cable.

Connection of Management Station

The Network Management Station connection is made through the Ethernet interface, available in the Management Ethernet connector of the CM-2 interface module (this is a 10BaseT interface for the LRSI-F1-CM2 module and a 10Base2 interface for the LRSI-F2-CM2 module).

Figure 4-4shows a typical connection in which a network management station with 10BaseT Ethernet interface is connected through a hub to several LRS-24 units installed in a rack.

Figure 4-1shows a typical configuration without hub. In this case, the Management Ethernet connectors of the LRS-24 units connect directly to the Ethernet media. For convenience, the 10BaseT interface in the LRSI-F1-CM2 module can be adapted by means of internal jumpers (Installation and Setup in Chapter 2) to enable connection by means of straight cables, either to a hub or directly to the LAN media.

Hardware Requirements 4-7

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