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Digital Display Scaler • Programmer’s Guide 4-5
Host-to-Scaler Instructions
The scaler accepts SIS (Simple Instruction Set) commands through the
Remote port. SIS commands consist of one or more characters per command field.
They do not require any special characters to begin or end the command character
sequence. Each scaler response to an SIS command ends 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.
Scaler Error Responses
When the scaler receives an SIS command and determines that it is valid, it
performs the command and sends a response to the host device. If the scaler is
unable to perform the command because the command is invalid or contains
invalid parameters, the scaler returns an error response to the host. The error
response codes are:
E01 — Invalid input channel number (too large)
E10 — Invalid command
E11 — Invalid preset number (too large)
E13 — Invalid value (out of range)
E17 — Illegal command for this signal type
Using the Command/Response Table
The command/response table begins on the next page. Except for the horizontal
and vertical filter settings, upper or lower case letters are acceptable in the
command field. The table below shows the hexadecimal equivalent of each ASCII
command. Symbols, defined on page 4-2, are used throughout the table to
represent variables in the command/response fields. Command and response
examples are shown throughout the table.
ASCII to HEX Conversion Table
Space
With the exception of the horizontal and vertical filtering (D and d)
commands, the SIS commands are
not case sensitive.