RAD Data comm LRS-24 Hardware Requirements, Terminal Characteristics, Connecting the Terminal

Chapter 3 Management via the CM-1 Module LRS-24Installation and Operation Manual

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.

3-2 Hardware Requirements

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