Bittner Audio - Application Handbook
Page 49
3.7.9.
Special Functions
3.7.9.1.
Configuration Switching via the Logic Inputs
The configurations of the SXL may be also re-called via the SXL’s logic inputs. This provides, for
example, external control without a network connection. The voltages applied 4 logic inputs are
interpreted as a 4-Bit word:
Configuration
Input 4
Input 3
Input 2
Input 1
1
0
0
0
1
2
0
0
1
0
3
0
0
1
1
4
0
1
0
0
5
0
1
0
1
6
0
1
1
0
7
0
1
1
1
8
1
0
0
0
9
1
0
0
1
10
1
0
1
0
11
1
0
1
1
12
1
1
0
0
13
1
1
0
1
14
1
1
1
0
15
1
1
1
1
The bit-word 0000 is not listed as it is being used for a different purpose (see below).
Switching by the logical inputs is globally activated for the SXL. The appropriate parameter
CfgByInput
is located in menu
SXLSTAT
and should be switched
ON
.
To re-call a configuration, it makes no difference whether the applied bit-word is permanently or
momentarily applied. The appropriate SXL configuration will be re-called and then written to
configuration 0 which will then be started. Please note: configuration 0 always holds a copy of the
last re-called configuration (refer to 3.7.8.2.4. Configurations Seite 45).
Example: To re-call configuration 11, the bit muster 1011 should be applied to the logic inputs. The
SXL will start configuration 11. The contents of configuration 11 will then be copied to configuration
0. After disconnecting the control voltages, the SXL switches to configuration 0 which is now
identical to configuration 11.
If the switching should be controlled by a mechanical multi-switch, it is important to note that the
contacts may bounce electrically. This effect is typical for elastic components inside switching
mechanisms. As a result, the SXL may switch several times between two configurations.
The parameter
CfgDelay
in the
SXLSTAT
menu is used to avoid this negative effect. It is
accessible in Service Mode 1 (refer to 3.7.8.1.2. Entry Modes & Status Information Seite 40). It
defines how long a bit-word needs to be applied (in steps of 100ms) until it is recognized by the
SXL. The delay is set by numbers between 2 and 20. These numbers need to be multiplied by
100ms. Consequently, the value 5 represents 500ms.
If the relays of the SXL are not being used for the error matrix, they may be used to represent the
active configuration. To obtain a correct read-out, the bit-words of the above table need to be
configured. An additional external decoder may then display these bit-words on a line of LEDs.
