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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).
SMD101-initiated Messages
The SMD101 initiates messages under specific conditions. No response is required from
the host. The SMD101-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 SMD101 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 SMD101 is on, it sends the boot and copyright messages when a Telnet
connection to the SMD101 is first opened. The day of the week, date, and time are
shown when the SMD101 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 SMD101
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
Figure 53. ASCII to Hex Conversion Table
61SMD101 • Remote Communication and Control