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DTP T USW 233 • Remote Control 13
Simple Instruction Set Control
The DTP T USW 233 switching transmitter can be remotely controlled using SIS commands
from a host device such as a computer or control system via its rear panel Remote RS-232
port (see item h on page 5) or front panel Configuration (USB) port (see item a on
page 8).
The default serial port protocol of the port is as follows:
• 9600 baud • No parity • 8-bit
• No flow control • 1 stop bit
Host-to-Switcher Communications
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
switcher executes the command and sends a response to the host device. All responses
from the switcher 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.
Switcher-Initiated Messages
When a local event occurs, such as a front panel operation, loss or restoration of an input
signal, or an error condition, the switcher responds by sending a message to the host. The
switcher-initiated messages are listed below:
© Copyright 20yy, Extron Electronics DTP T USW 233, Vx.xx, 60-nnnn-nn
]
The switcher issues the copyright message when it first powers on. Vx.xx is the firmware
version number and 60-nnnn-nn is the part number.
Inn All
]
The switcher also sends the Inn message whenever the selected input is changed. n is the
input number. A 0 in the n field indicates no input is selected.
Error responses
When the switcher receives a valid SIS command, it executes the command and sends a
response to the host device. If the switcher is unable to execute the command because the
command is invalid or it contains invalid parameters, the switcher returns an error response
to the host. The error response codes are:
E01 — Invalid input channel number (out of range)
E06 — Invalid channel change
E10 — Invalid command
E13 — Invalid parameter
Timeout
Pauses of 10 seconds or longer between command ASCII characters result in a timeout.
The command operation is aborted with no other indication.