Knoll HD110 User Manual

HD110 Command Line Interface

Purpose

This specification will define the serial command line streams for controlling a Knöll
projector through the RS232 connector to the projector. These commands are intended
to provide a simple secondary set of controls to the projector through what Knöll calls
the Command Line Interface (CLI). The primary control set is through the Host
Command Interface. The CLI is designed for use by what the industry commonly calls
boardroom controllers. The CLI will accept commands via RS232 to control the
necessary features used by most boardroom controllers. This CLI language will use a
simple human readable protocol to help facilitate the installers’ time necessary to setup
or diagnose a problem with boardroom control installations. However, the CLI is not a
guaranteed delivery system. The CLI is used internally at Knöll as a debugging tool and
for downloading software.

Message Format

As commonly used in math notation, everything is evaluated in the parenthesis first, as
the parentheses are designed to group things together. This same parenthesis
nomenclature will be used to group a command and its data together (nested
parenthesis are not supported). All commands are three alpha characters followed by
the request. The request can be a ? symbol which signifies a read request, or a
numerical number represented by 1 to 4 ASCII digits, which signifies a write request.
Not all commands support reading and writing. The command table indicates the
commands and requests that are supported.

Write Commands

Write commands have the following format:

(AAA####) where,

( - starts the CLI command

AAA - denotes the CLI function

#### - denotes the value to be written (leading zeros are not

necessary)

) - ends the CLI command

Some functions have ranges for settings while others are Boolean. Settings with
ranges range from some minimum number to a maximum number. If a number
greater than the maximum is received, it is automatically limited to the maximum
number for that function. If a number less than the minimum is received, it is
automatically limited to the minimum number for that function. It is suggested that each

function be queried for its range with a read command before issuing a write
command. Boolean settings consider 0 as off and 1-9999 as on. The only exception is

the Power command. The only valid write values that will be accepted will be ‘0’ for
turning the power off and ‘1’ for turning the power on.

Examples:

Brightness Command (BRT10) Sets the brightness to 10
Volume Command (VOL0000) Set the volume to 0
Freeze Command (FRZ1) Freeze the display
Freeze Command (FRZ9999) Freeze the display
Power Command (PWR0) Turn power off
Power Command (PWR1) Turn power on
Power Command (PWR9999) ERROR: not recognized as a valid command

Read Commands

Read commands have the following format:

(AAA?) where,

( - starts the CLI command

AAA - denotes the CLI function

? - denotes the read request

) - ends the CLI command

A read command returns the range and the current setting in an ASCII format enclosed in
parentheses.

Examples:

Brightness Command (BRT?) Returns (0-22,10)

Volume Command (VOL?) Returns (0-80,0)
Freeze Command (FRZ?) Returns (0-1,1)

Error Conditions If a command is received that is not understood, a ‘?’ character will be returned

indicating the command was not understood.

Limitations The CLI cannot respond to commands coming in at a high-rate. Therefore, a delay
must occur between commands to ensure that the command is properly executed.

Supported Commands See below for a list of supported CLI commands for HD110.

Table 1.

HD110 CLI Commands

Cmd Attr Computer

Video

Inc Function

AIM

ARZ

R &
W

R &
W

Range Value Range Value

0 – 1 1 0 – 1 1 1

0 – 3
0 = standard
1 = native
2 = widescreen
letterbox
3 = enhanced

1

0 – 3
0 = standard
1 = native
2 = widescreen
letterbox
3 = enhanced

1 1

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