Pira P275R User manual

P275R
FM Monitoring Receiver with Two Relays
User Guide
Web: http://www.pira.cz E-mail: [email protected]

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Contents
1Introduction........................................................................................................................................................................................................ 3
1.1 Using this guide.............................................................................................................................................................................................. 3
1.2 Description of the equipment ......................................................................................................................................................................... 3
1.3 Other documents............................................................................................................................................................................................ 3
1.4 Technical parameters..................................................................................................................................................................................... 3
2Hardware description........................................................................................................................................................................................ 4
2.1 Connectors, control elements and status indicators ...................................................................................................................................... 4
3Installation.......................................................................................................................................................................................................... 5
3.1 Hardware installation...................................................................................................................................................................................... 5
3.1.1 Power supply, antenna input ................................................................................................................................................................ 5
3.1.2 Alarm Outputs....................................................................................................................................................................................... 5
3.2 Software installation....................................................................................................................................................................................... 6
3.2.1 First communication with the FM Scope application ............................................................................................................................ 6
3.2.2 Alarm Outputs setup............................................................................................................................................................................. 6
3.2.3 Headphones audio output setup........................................................................................................................................................... 6
3.2.4 Saving current configuration................................................................................................................................................................. 6
4ANNEXES............................................................................................................................................................................................................ 7
4.1 Connection diagram ....................................................................................................................................................................................... 7
4.2 Part list ........................................................................................................................................................................................................... 8
4.3 Device differences.......................................................................................................................................................................................... 8
4.4 Specification of pluggable terminal blocks (included) .................................................................................................................................... 9

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1Introduction
1.1 Using this guide
This guide covers the P275R FM monitoring receiver. It provides the information needed to install and using the device.
Please read this entire guide and familiarize yourself with the controls before attempting to use this device.
If you have any questions or comments regarding this document, please contact us via email.
We welcome your feedback.
1.2 Description of the equipment
This compact device extends the original P275's capabilities with two independent general purpose relays, driven by alarm outputs. The relay
function is user configurable. Total four alarm outputs are provided, with LED status indication for each output. The relay pins and the Alarm
Outputs are accessible via terminal blocks. The device is equipped with USB B-type socket. The aluminum case provides excellent shielding in
strong RF signal environment.
The device is fully compatible with the P275 FM Analyzer. The FM Scope control software for Windows is used for setup and provides access
to all measurements and values.
1.3 Other documents
This document is not a complete reference manual. Please visit the website for more information:
P275 FM Broadcast Analyzer User Manual
FM Scope User Guide
Support section at http://www.pira.cz
1.4 Technical parameters
Parameter
Value
Outer dimensions
144 x 105 x 37 mm
Power supply voltage
5 V DC
Ripple allowed
max. 200 mV pp
Supply current
max. 200 mA
Power supply connectors
USB or DC 1.3/3.5mm
RF input
BNC 50 ohms
Max. input RF power
20 mW
Terminal block type
Pluggable, included.
Relay type
SPDT, two independent relays
Relay maximum load
24 V, 2 A
IMPORTANT!!! The device power supply voltage is 5 V. Exceeding that voltage will
result in permanent damage to the device! Always check the power supply voltage.
CAUTION!!! Never exceed the relay maximum switching voltage: 24 V.
Exceeding that voltage may result in permanent damage or electric shock!

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2Hardware description
2.1 Connectors, control elements and status indicators
All the elements can be found on the side panels:
Connector or element
Description
Input
Input connector for RF or MPX signal. Nominal input impedance is 50 ohms for RF.
Max. RF power is 20 mW.
Max. MPX signal swing is 8.0 Vpp.
USB
Allows connection of external 5V power supply or connection to a PC.
Serial communication speed of this port is currently fixed to 115200 bps.
PWR
Power LED. It signalises that the device is turned on.
EXT 5V
Power supply connector.
Recommended power supply adapter: 5 V, min. 1 A, connector 1.3/3.5mm, central is .
IMPORTANT! Exceeding the voltage will result in permanent damage to the device!
Headphones
Stereo 3.5mm JACK connector for optional connection of headphones.
RS-232
Serial RS-232 connector female type. Communication speed of this port can be 19200 or 115200 bps.
The device currently does not support concurrent communication on the RS-232 and USB ports.
Depending on mechanical characteristics of the connectors, the RS-232, EXT 5V and Headphones may not
be usable at the same time.
Alarm Outputs
The device provides four independent digital outputs, marked 1 to 4. Outputs 1 and 2 also drive built-in relays.
Status of each output is indicated by LED. Each alarm output can be used either as general purpose output or
various conditions may be assigned, like measured value out of range, RDS TA status etc.
Wires can be connected to the alarm outputs via pluggable terminal blocks. This accessory is included.
For more information, please follow the document ‘P275 FM Broadcast Analyzer User Manual’ (available online).

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3Installation
3.1 Hardware installation
3.1.1 Power supply, antenna input
Please follow the original P275 User Manual.
3.1.2 Alarm Outputs
The device provides four independent digital outputs, marked 1 to 4. Alarm outputs 1 and 2 also drive built-in relays. Status of each output is
indicated by LED.
Following block schematic summarizes the Alarm Outputs connection. The relays are drawn in Off position:
ALARM 4
ALARM 3
ALARM 2
ALARM 1
+5V
GND
ESD Protection
Relay Driver
Relay Driver
Each alarm output can be used either as a general purpose output or various conditions may be assigned, like measured value out of range,
RDS TA status etc. Future firmware versions will bring further possibilities and conditions.
Alarm status
LED indication
Alarm digital output
Relay position
Active
On
High, 5 V
On
Not active
Off
Low, 0 V
Off
Power supply line (+5V) is available as well, for optional use. The relay pins are ‘floating’ – isolated from the rest of the device’s circuits.
Wires can be connected to the alarm outputs via pluggable terminal blocks. This accessory is included.
For more information, please follow the document ‘P275 FM Broadcast Analyzer User Manual’ (available online).

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3.2 Software installation
3.2.1 First communication with the FM Scope application
The FM Scope application is free for download at https://www.pira.cz.
In case of USB connection, install the USB drivers first.
In the Connection field, select ‘Serial RS232/USB’ connection type. Select the COM port assigned to the device by the system. Select 115200
bps communication speed. Finally click on Connect.
The application status bar at the bottom indicates the connection status. Verify the function by selecting a local station and clicking on Tune.
In Options –Preferences –General –Application Settings select the option Online update of deviation and signal.
Finally tune the frequency of interest and if necessary, adjust the antenna position for getting full (5/5) signal quality.
3.2.2 Alarm Outputs setup
For basic alarm use, select Options –Alarm Outputs.
For using some alarm output as general purpose output or RDS TA output, go to Text console card and type appropriate command in the
bottom line. Follow the original P275 User Manual for details.
Examples:
Script command
Meaning
send(ARJ:TA*X)
Alarm 2 output is driven by RDS TA (Traffic Announcement)
send(ARI:GD*X)
Alarm 1 output is used as general purpose output and it’s now driven low
send(ARK:GH*X)
Alarm 3 output is used as general purpose output and it’s now driven high
3.2.3 Headphones audio output setup
The analogue audio output may be useful in some specific applications. The audio output options are available in the menu: Options –DIP
Switches and Analogue I/O. Here you can adjust volume, pre-emphasis and some more parameters.
Note: Requires firmware version 2.2b r6 or later and FM Scope version 1.6.1 or later. The headphones audio output is not suitable for audio
applications like rebroadcasting. Higher volume results in better S/N.
3.2.4 Saving current configuration
Once all settings are done, save the configuration to the device’s non-volatile (permanent) memory:
In toolbar, click on the button
The device is now ready for stand-alone operation.
Each step represents 6 dB change
If checked, the trackbar position takes effect
immediately

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4ANNEXES
4.1 Connection diagram

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4.2 Part list
Marking
Description
Ordering code
D1, D2, D3, D4, D5
LED white
OSW54008C1F
D6, D7, D8, D9, D10, D11, D12
Schottky diode 1A
SK13, SK24
Q1, Q2
Transistor
BC847C
U1
Serial to USB
FT232RL
U2, U3, U4, U5
Buffer
74LVC1T45W6-7
U6
ESD protection
SRV05-4ATCT
C1, C2, C3, C4
Capacitor 100n
C5, C6
Capacitor 10u/16V
R1, R2, R3, R4, R5, R10
Resistor 1k
R6, R7, R11, R12, R13, R14, R17
Resistor 220R
R8, R9, R15, R16
Resistor 2k
RE1, RE2
Relay SPDT 6V
RY211006
P275M
P275 FM Analyzer Board
Housing
1455L1201
4.3 Device differences
Feature
P275 FM Analyzer
P275R FM Monitor
HMI (buttons, LCD display)


Operation from AA cells


External DC power supply connector


Built-in relays


Five LED indicators


Terminal blocks


USB connection
USB Micro
USB B
Features which are not listed are common to both device variants.

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4.4 Specification of pluggable terminal blocks (included)
A
2. 15
1.90
15.60
7.20
f2.00
f1.20
6. 35 11.00
( N-1) X 3.50 + 4.30
( N-1) X 3.50
Manufacturer
DEGSON ELECTRONICS CO., LTD.
Model names
15EDGK-3.5/2P-13, 15EDGK-3.5/4P, 15EDGK-3.5/6P
Pitch
3.5mm
Wire range
28-16AWG (0.5-1.5mm2)
Torque
0.2Nm (1.7Lb-In)
Strip length
7mm
Screws
M2