Aim ARINC 429 - 5.1 Api429 CmdTxAmpIni

78 Software Library Reference Manual for VME 429
Section 5 – Transmitter Functions
5.1 Api429CmdTxAmpIni
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AiUInt8 Api429CmdTxAmpIni( AiUInt8 b_Module, AiUInt8 b_Chn, AiUInt8 b_Ampl );
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API429_TX_AMP_INI (0x71)
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This command defines the output amplitude of the selected API429 transmitter
channel via a D/A converter.
Note: The transmitter output amplitude cannot be changed for APM429 and
AMC429 boards!
In this case a call to this function has no effect!
Note: After a Api429CmdReset command or the Api429CmdTxIni command the
related D/A converter is loaded with 0x7A which corresponds to an output
voltage of 9.0 Volt (line to line).
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Channel Number
Value Description
1..32
API429 transmitter channel number
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Amplitude Control
Value Description
0..149
Corresponds to an amplitude in the range of 0 to appr. 11
Volts (peak to peak) line to line.
Note: The output Voltage can be estimated from the amplitude setting using the
following formula:
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= (0..149) * 0.074 Volt
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Value Constant Description
0 API429_CMD_OK
Execution success
1 API429_CMD_ERR
Execution error