RAD Data comm LRS-24 - Manual (Page 71)

LRS-24 Installation and Operation Manual Chapter 4 Management via the CM-2 Module
Hardware Requirements 4-7
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 4-3 show 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 4-4 shows 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 4-1 shows 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.
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