- RAD Data Communications LRS-24 12-slot Link Access Rack with SNMP Version 3.00 Installation and Operation Manual

Chapter 3 Management via the CM-1 Module LRS-24 Installation and Operation Manual
3-2 Hardware Requirements
3.2 Hardware Requirements
Terminal Characteristics
You can use most types of standard ASCII terminals in order to manage the
modules installed in an LRS-24, via a CM-1 module. The terminal, which can be a
“dumb” terminal or a personal computer emulating an ASCII terminal, requires an
RS-232 communication interface.
The terminal types supported by the modules that can be installed in the LRS-24
are VT-52, VT-100, TV-920, FREEDOM-100, FREEDOM-110, FREEDOM-220, or
other terminals that are fully compatible with one of these terminals.
The software used to operate the supervision program is contained in the managed
modules. Refer to the Installation and Operation Manual of the relevant modules
for detailed terminal operating instructions.
The managed modules store all the configuration information generated or altered
during the communication with the terminal: no information is stored in the
terminal.
Modules must be initialized properly to ensure correct terminal operation as
explained in Section 3.3; otherwise some of the commands may not work
properly.
Management RS-232 Port Interface Characteristics
The CM-1 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 and their directions appear in Appendix A.
After establishing communication with a module, you can select the data rate and
the word format (number of data bits, parity type, and number of stop bits). This
information is provided in the Installation and Operation Manuals of the modules
installed in the LRS-24.
For initial operation, it is recommended to start with the default parameters:
Default data rate: 38.4 kbps
Default word format: one start bit, eight data bits, odd parity, one stop bit.
Connecting the 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-1 module
supports only dial-in; it cannot dial out.
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