FOX3 T 201 Transmitter • SIS Configuration and Control 19
Simple Instruction Set Control
Host-to-Unit Instructions
SIS commands consist of one or more characters per field. No special characters are
required to begin or end a command character sequence. When a command is valid, the
transmitter executes the command and sends a response to the host device. All responses
from the transmitter to the host end with a carriage return and a line feed (CR/LF = ]),
which signals the end of the response character string. A string is one or more characters.
Device-Initiated Power-Up Message
When the device completes its start‑up, it issues the following message to the host:
© Copyright 20yy, Extron FOX3 T 201 MM (SM), Vx.xx, 60‑nnnn‑nn
• 20yy is the copyright year
• Vx.xx is the firmware version number
• 60‑nnnn‑nn is the part number.
NOTE: This message only displays if the FOX3 device is connected to the serial port.
Error Responses
When the transmitter receives a valid SIS command, it executes the command and sends a
response to the host device. If the transmitter is unable to execute the command because
the command is invalid or it contains invalid parameters, the transmitter returns an error
response to the host. The error response codes are:
• E10 — Invalid command • E21 — Invalid room number
• E11 — Invalid preset number • E22 — Busy
• E13 — Invalid parameter • E24 — Privilege violation
• E14 — Invalid for this configuration • E25 — Device not present
• E17 — Invalid command for signal type • E26 — Maximum number of connections
exceeded
• E18 — System or command timed out • E28 — Bad file name or file not found
Timeout
Pauses of 10 seconds or longer between command ASCII characters result in a timeout.
The command operation is aborted with no other indication.
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