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
