Extron electronic manual Host-to-device Communications, SMD 101-initiated Messages

Host-to-device Communications

The commands listed in the following tables perform the same functions, but are encoded differently to accommodate the requirements of each port (Telnet or browser).

SMD 101-initiated Messages

The SMD 101 initiates messages under specific conditions. No response is required from the host. The SMD 101-initiated messages are listed here (underlined).

© Copyright 20nn, Extron Electronics, SMD 101, Vn.nn, 60– nnnn-nn Day, DD MMM YYYY HH:MM:SS

Vn.nn is the firmware version number.

The SMD 101 sends the boot and copyright messages under the following circumstances:

•If the SMD 101 is off and an RS-232 connection is already set up (the PC is cabled to the SMD 101 and a serial communication program such as HyperTerminal is open), the connected unit sends these messages via RS-232 when first powered on.

•If the SMD 101 is on, it sends the boot and copyright messages when a Telnet connection to the SMD 101 is first opened. The day of the week, date, and time are shown when the SMD 101 is connected via Telnet, but not via RS-232. If using a Telnet connection, the copyright message, date, and time may be followed by a password prompt.

Password Information

The ]Password: prompt requires a password (administrator level or user level) followed by a carriage return. The prompt is repeated if the correct password is not entered.

If the correct password is entered, the unit responds with ] Login Administrator ] or ] Login User ], depending on the password entered. If passwords are the same for both administrator and user, the unit will default to administrator privileges.

Using the Command and Response Tables

SIS commands consist of a string (one or more characters per command field). No special characters are required to begin or end a command sequence. When the SMD 101 determines a command is valid, it executes the command and sends a response to the host device. All responses end with a carriage return and a line feed (CR/LF = ]), signaling the end of the response character string.

When programming, certain characters are more conveniently represented by their hexadecimal rather than ASCII values. The table below shows the hexadecimal equivalent of each ASCII character:

ASCII to Hex Conversion Table

Space

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Figure 53. ASCII to Hex Conversion Table

SMD 101 • Remote Communication and Control 61