Rs232 Connection - Knoll Eco-System GRS44 Installation Instructions Manual

RS232 Connection

The RS232 connection is used to control the GRS44 by an external controller or
computer and can work with our without keypads. The GRS44 connects to the RS232
controller with a 9-pin db9 connector. The programming reference follows.
1.0 Terminal Settings
To control the GRS44 amplifier via other control systems, connect a RS-232 cable to the serial
control connector on the rear of the GRS44 and set your computer's or control unit port settings
to match the following configuration:
SETTING
Bits per second
Data bits
Parity
Stop bits
Flow control
Emulation
1.1 Command Summary
All commands are enclosed in parentheses. The request can be in some cases a read request
(followed by a "?"), or a write request (followed by 0-2 ASCII digits). A read command will return
the current setting, and write command will change the setting.
Read request format: (nAA?) where:
( starts the command
n denotes amplifier channel (if required)
AA denotes the command (may be 1 or 2 letters)
? denotes the read request
) ends the command
Read Request Example 1.1:
Function
Volume
Write request format (nAA$$) where:
( starts the command
n denotes the amplifier channel (if required)
AA denotes the command (may be 1, 2 or 3 letters !!)
denotes the value to be written if required (leading zero's ARE necessary)
$$
) ends the command
Write Request Examples 1.2:
Function
Turn Channel On
Select Input
Set Volume
VALUE
19,200
8
None
1
None
Auto detect
Command
(1vl?)
Command
(1on)
(1sl4)
(1vl50)
Response
returns the volume on channel 1 (0-87)
Response
turns on amplifier channel 1 on
turn amplifier channel 1 to input 4
turn amplifier channel 1 to volume 50
(of 87)
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