Procom EVS200 user manual Command FA3 Function, AM90 CR , AM 150 CR, Example CR DDM, CR RF level

VOR/ILS Analyzer EVS200

		Chapter 3: Operation
Command FA3
command	function
FA3 <Fast DDM measuring on>	Activating the Fast DDM measurement

The command FA3 switches on the fast DDM measurement. The measuring, used only for landing path measurement can only be activated through a controller. The command FA3 performs the con- tinuous measurement and output of the DDM, RF level, Modfactor 90 Hz and Modfactor 150 Hz. The 50-ms measurement interval consists of DSP analysis, DSP data transmission to the host processor and conversion of the DSP raw measurement value into DDM, dBm and AM %. The measurement values output is performed in this mode as interrupt operation via RS232 interface.

In this Fast-Mode (FA3) a measurement value set will only be transmitted to the PC if it is demanded by a short command (1 ASCII-Character). The response from the EVS200 is performed without a longer delay within about 15 to 20 ms between measurement value demand and measurement value transmission. The stated RS-232-transmission times are related to 19.200 Baud.

The measurement values can be read in and output as a text file corresponding to the terminal pro- gram.

The baud rate must be set to 19200 baud in the Setup of the VOR/ILS Analyzer

EVS200. It must be attended the acceptance of the data transfering rate by the terminal program.

￿The measurement can be stopped through the command FA0 (refer to Command FA0) or <CR>.

Example:	command from the controller		response of the VOR/ILS Analyzer EVS200
input:	e.g. A		output form: (DDM <CR >, RF level <CR >,
	￿	Demand for measurement		AM90 <CR >, AM 150 <CR >)
			output form as FA2
		values output:
	all ASCII characters without:		example:	-0001 <CR > (DDM),
	CR (0Dh), LF (0Ah), # (23h), @ (40h)
				-412 <CR > (RF level),

With the command FA3 the echo	201 <CR > (AM90),
mode is automatically switched
	202 <CR > (AM150),
OFF.
1/90Hz = 11.1msec.

N

N+1

N+2

N+3

N+4

N+5

N+6

N+7

N+8

N+9

N+10

DSP-Analysis

Programm-Interrupt

DATA-Transfer

DDM, AM90, AM150,

DATA-Transfer

DDM, AM90,

AM150,

DATA-

RF-Level - Calculation

RF-Level -

Calculation

RS232-

Transfer

15...20 msec.

Request fromPCl

to EVS200 (RXD)

Answer to PCl

N

fromEVS200 (TXD

10 msec.

0796.1800.02 E-8 41