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m4a5a_v320_eng (14.02.2013)
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Kompetent für Elektroniksysteme
m4a5a_v320_eng (14.02.2013)
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Kompetent für Elektroniksysteme
Inputs / Outputs
The in/outputs are configured in registers 096 and 097.
Ex factory both registers are set as follows:
register 096
11111000
programs the I/Os 1-5 as output, not inverted
register 097
11100000
programs the I/Os 6-8 as output, not inverted
The outputs are open collector circuits. They can be configured as follows:
- 1 not inverted,
passive state: switch is open, active: switches to GND
- 8 outside switching, is input and not inverted output, simultaneously
the state of the input can be read out, so that a switching state imposed on
the I/O from an external source can be interpreted.
- 9 inverted,
passive state: switches to GND, active: switch is open
If a connection is to be configured as input, the respective digit has to be coded with
- 2: input is low-active, i.e. is switched to GND
- 3: input is high-active, i.e. is switched to +batt
Inputs can be assiged different functions. Therefor, it has to be decided, if the input is switched on
or off.
Example: Cross-Mute function
If two Major 4a/5a control sets are situated next to each other it might be desired to mute the
loudspeaker of the respective inactive Major. Hence, if one Major is used for conversation, the
other one is muted.
Therefor, I/O pin 2 is to be used. As the inputs are to be switched as well as read out, it is necessa-
ry to configure the I/O for outside switching:
Register 095 18111000
2
nd
digit: 8, I/O 2 is configured for outside switching.
For the muting the function radio-mute (see Table of Registers, register 083)is used.
Register 083 22000000
Digit 1defines I/O pin 2 as muting output, the 2
nd
digit configures the
output to low-active and activates it only during transmission (TX or PTT is pressed).
Now, the function for external muting still has to be programmed for I/O pin 2 (see Table of Regis-
ters, function 9). For I/O pin 2 this is done in register 112/113.
Register 112 91110000
function 9 (digit 1) with subfunction 1 (digit 2) stands for external mu-
ting. The ‘1‘ at digit 3 activates muting if input 2 is activated. The ‘1‘ in digit 4 causes flashing of the
PTT button if the input is activated from outside.
Register 113 91000000
function 9 (digit 1) with subfunction 1 (digit 2: external muting) disab-
les the muting and flashing again if input 2 is back to the inactive status (‘0‘ in digit 3)
Both I/Os have to be connected to each other. The easiest way to do this is the use of an ordinary
patch cable (if no other I/O-Pins are in use) to connect the I/O sockets of both Majors.