Adeunis RF ARF54 User manual

A
RF54 UART TTL modules
User Guide
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paper version, photocopy) without Adeunis RF consent.
This document is subject to change without notice.
All trademarks mentioned in this guide are the property of their respective
owner.
ADEUNIS RF
283, rue Louis Néel
38920 Crolles
France
Phone [phone]
Fax [phone]
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RF54
User Guide
Table of Contents
Table of Contents..............................................................................1
About this Document ........................................................................2
Overview...........................................................................................3
Interface ...........................................................................................3
Mechanical specification........................................................................3
Signal description.................................................................................5
General purpose I/O extended functionality ...........................................6
Radio communication .......................................................................9
Radio channels & Sub Bands.................................................................9
Channel selection...............................................................................10
Air radio rate selection........................................................................11
Channel rejection ..............................................................................11
RSSI reading......................................................................................12
Transceiver operating mode ...........................................................12
Command mode.................................................................................13
Transceiver mode...............................................................................14
Transceiver state machine ..................................................................14
Power management : low power mode................................................15
AT Commands .................................................................................15
Description ........................................................................................15
Set of commands ...............................................................................16
Register description............................................................................17
Specification ...................................................................................21
Glossary ..........................................................................................22
ANNEX 1 : Alternative mounting.....................................................22
ANNEX 2 : Firmware updates..........................................................23
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RF54
User Guide
About this Document
This guide describes the A
RF54
devices, their options and accessories.
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RF54
User Guide
Overview
The ARF54 radio transceiver converts data from a serial link into a radio frame
to be sent to a similar piece of equipment. The communication is half-duplex.
The operating parameters of these radio transceivers (serial link, radio
management…) can be fully updated through AT commands via the serial
link.
Interface
Mechanical specification
The transceiver is available in only one format: plugged module without
antenna.
The PCB width is 12/10 mm
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RF54
User Guide
Figure 1: Plugged module mechanical feature
This module has been designed to be plugged (as describe above). If this
assembly doesn’t suit your requirement, please have a look to Annex 1
(mainly for horizontal mounting).
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RF54
User Guide
Signal description
Inter
-face
Pin Name I/O Description Alternate function
Digital interface
1 GND Ground
2 VDD Operating voltage
8 TXD O Serial data transmission
7 RXD I Serial data reception
3 /RTS
O Request To Send
RTS = GND, the transceiver is able
to
receive serial data
RTS = VDD, serial data received by
the transceiver are lost
10 /RESET I Transceiver Hardware RESET, active
LOW.
5 PWD I Power down management
16 GPIO1 /
PC0 I/O Extended general purpose I/O
13 GPIO2 /
PC1 I/O Extended general purpose I/O RS485
14 GPIO3 /
PC2 I/O Extended general purpose I/O
11 GPIO4 /
PC3 I/O Extended general purpose I/O RS485
12 GPIO5 /
PC4 I/O Extended general purpose I/O RS485
9 GPIO6 /
PC5 I/O Extended general purpose I/O or I (input only for the American version)
6 GPIO7 /
PD5 I/O Extended general purpose I/O RS485
15 GPIO8 /
ADC7 ADC Analog to digital conversion
17, 18 GND Ground
RF interface
19, 20 GND RF RF antenna ground
21, 22 RF in/out RF antenna IN/OUT.
23, 24 GND RF RF antenna ground.
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RF54
User Guide
Description Min Max Unit
Vil1 Input low voltage except
/RESET -0.5 0.3VDD V
Vih1 Input High voltage except
/RESET 0.6VDD VDD+0.5 V
Vil2 /RESET Input low voltage -0.5 0.2VDD V
Vih2 /RESET Input High voltage 0.9VDD VDD+0.5 V
/RESET pulse width 2.5 - µs
General purpose I/O extended functionality
RS485 interface
The S215 register allows enabling the management of the control lines (/RE
and DE lines) of most RS485 buffer. The following figures illustrate the
RS485 wiring and the configuration required for activating the DE and /RE
management. Even one line is sufficient, for more flexibility two different
lines could managed the DE and RE RS485 control lines. Hereafter a
connection example with both lines or one line only.
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RF54
User Guide
CAUTION
•the /ENABLE485 is read ONLY at power-up. Changing the
/ENABLE485 (GPIO7) when the transceiver is already running will
not be taken in account.
•when activating the RS485 interface the GPIO5 will be set as an
output.
S215
Value /ENABLE 485
(GPIO7)
DE/RE
state Note GPI O2 GPI O4 GPI O5 GPI O7
1 GND Output RS485 control lines
management Outp ut Outp ut Outp ut Input
1 VDD Input RS232 configuration Input Input Input Input
0 Input Input RS232 configuration Input Input Input Input
Table 1: R485/232 configuration settings
By default, the DE and RE lines are asserted LOW, allowing the reception of
characters from the RS485 differential bus. The DE and RE lines are asserted
HIGH only when one or several characters have to be transmitted over the
RS485 differential bus: when a radio frame is demodulated, the lines are
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RF54
User Guide
asserted HIGH and then the data extracted from the radio frame are sent to
the module TXD line and therefore to the RS485 differential bus. When the
last character has been transmitted over the RS485 differential bus, the lines
are asserted LOW.
TXD n DATA bytes
Tde Thold
DE/RE
Figure 2: DE/RE timing when data are sent over the serial link
•Thold : minimum = 1 µs
•Tde : set according to the S219 register value (see table hereafter)
S219 0 1 2 3 4 5 10 20 40 60 80
Tde
min 20 µs 40µs 60 µs 80 µs 100 µs 110 µs 250 µs 480 µs 900 µs 1.3 ms 1.7 ms
•In command mode, when a reply is sent back (on the TXD line)
according to the following DE/RE timing :
Figure 3: DE/RE timing when a reply is sent back on the TXD line
RXD CMD
TXD REPLY
≥700 µS
≥100µs
≥100µs
DE/RE
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RF54
User Guide
Radio communication
This modem has 50 channels over the 902-928 MHz Band used through FHSS
transmission. Hopping is possible over the whole range but also selectable
over up or down sub-bands. These modes can be selected using AT
commands.
Wide Band transmission :
•3 modes, FHSS over 25 or 50 channels
•57,6 kbit/s radio rate
•channel spacing: 500 kHz
•Sensitivity : - 106 dBm
•Adjacent channel rejection
see chapter “channel rejection”
Narrow Band transmission :
•3 modes, FHSS over 25 or 50 channels
•10 kbit/s radio rate
•channel spacing: 500 kHz
•Sensitivity : - 110 dBm
•Adjacent channel rejection
see chapter “channel rejection”
•
This module is designed to operate according to FCC Part 15.247.
NOTE
when delivered this modem is set up in Narrow Band to optimize the range.
The RF out power could be adjusted using AT commands (see register S231).
Radio channels & Sub Bands
The 50 channels are available according to the following table :
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RF54
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Channel
S200 Frequency (MHz) Channel S200 Frequency (MHz)
Low Sub Band High Sub Band
0 902.75 25 915.25
1 903.25 26 915.75
2 903.75 27 916.25
3 904.25 28 916.75
4 904.75 29 917.25
5 905.25 30 917.75
6 905.75 31 918.25
7 906.25 32 918.75
8 906.75 33 919.25
9 907.25 34 919.75
10 907.75 35 920.25
11 908.25 36 920.75
12 908.75 37 921.25
13 909.25 38 921.75
14 909.75 39 922.25
15 910.25 40 922.75
16 910.75 41 923.25
17 911.25 42 923.75
18 911.75 43 924.25
19 912.25 44 924.75
20 912.75 45 925.25
21 913.25 46 925.75
22 913.75 47 926.25
23 914.25 48 926.75
24 914.75 49 927.25
Figure 4: channels 1 Sub Bands
Channel selection
S220 = 2: Frequency hopping over the whole 50 channels
S220 = 3: Frequency hopping over the lower Sub Band
S220 = 4: Frequency hopping over the higher Sub Band
ATS200? = Viewing the hopping table (Channel numbers)
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RF54
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Air radio rate selection
ATTENTION
Radio rate default setup is 57600 bit/s.
S202 = 0: 10 kbps Narrowband
S202 = 1: 57.6 kbps Wideband
Channel rejection
The graph below shows the typical channels rejection in WideBand (WB) and
NarrowBand (NB) modes.
10
20
30
-2000 -1750 -1500 -1250 -1000 -750 -500 -250 0 250 500 750 1000 1250 1500 1750 2000
frequency step / Fchannel (kHz)
40
50
60
70
80
rejection (dB)
WB
NB
Particular attention is required for product installation. In the case where
several links must works in the same area (independently of the channel
positions), the minimum distance between 2 products belonging to different
radio links is 3 meters. Even with this precaution (depending of the product
environment), channel rejection could be reduced.
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RF54
User Guide
RSSI reading
The RSSI (Received Strength Signal Indicator) gives an indication for the
received power level on the first channel of the hopping table.
It could be accessed with ATS230?<cr> command.
Power level
•The RSSI level is only an indication. Use this level with care due to
the dispersion between components.
•The schema above could be modified from one to another product.
The operating temperature could also have an impact on these
dispersions.
•The RSSI level could also indicate the potential presence of any
jammer in the used channel.
•The RSSI is a necessary but not sufficient condition to obtain a
correct reception.
Transceiver operating mode
Two operating modes are available :
1. Command mode (usage of AT commands)
2. Transceiver or normal mode (serial data are transmitted on radio link)
At power up the transceiver is in transceiver mode: it is able to send / receive
data to / from the radio link according to its current parameter configuration.
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RF54
User Guide
Command mode
The command mode is used to read and update the modem configuration
registers using AT command.
NOTE
The AT command can be locked using ATPWD command.
In command mode, the radio is inhibited (reception and transmission),
excepted when using test command.
Entering command mode :issues on the serial link a +++ sequence. The
sequence of 3 consecutive + characters is accepted only if no character have
been seen before and after the +++ sequence. Register (S214) defines the
silence duration.
Tips 1:if you are using a terminal (such as Hyperterm), you have to send
the +++ sequence using a text file (first create a text file containing only the
+++ characters, and then use in Hyperterm the command “Send text file” in
the “Transfer menu”)
Tips 2:
Idle line for S214
duration +++ (consecutive) Idle line for S214 duration
++
+
TRANSCEIVER MODE COMMAND
MODE
RXD
line
Exiting command mode (return back in transceiver mode): send the serial
command ATO <cr>
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RF54
User Guide
Transceiver mode
The transceiver mode used a secured addressed protocol.
The communication is always half-duplex. The radio transmission is processed
prior to the radio reception. When the transceiver is sending a radio packet, it
is not able to decode any incoming radio packet.
If no data are sent on the serial link, the modem is waiting for radio
reception. Each radio packet sent by another modem is received and the
validated data extracted from the radio packet are sent on the serial link.
All the data received on the serial link are encapsulated in a radio packet.
In transmission mode, data received on the serial link are sent on the radio
link with the following format:
<Preamble><synchro><packet header> DATA <CRC><postambule>.
Preamble, synchronisation and postambule are used for the radio reception.
The packet header contains the following fields : packet length, number of
retries and packet number, target address.
The CRC follows the data and check the integrity of the radio packet.
The Target Address field is set up with S256 register. The Target Address
value 0000 is a broadcast address.
In reception mode: The <Target Address> field of the radio packet is
checked (if different of 0000) with the reception address (S252).
If the radio packet address matches the transceiver reception address (S252),
DATA (and only DATA) are transmitted on the serial link
Otherwise received data are silently discarded.
Transceiver state machine
When operating in transceiver mode the 'RF transmission' state machine is:
Idle state of the transceiver : by default the transceiver is waiting for
incoming data on the RS232 link and for incoming radio packet on the radio
link. Processing incoming RS232 data : the incoming RS232 data are
internally buffered. The buffered data are encapsulated in a radio packet and
transmitted. Processing incoming radio frame : the valid data are
extracted from the incoming radio packet and internally buffered. The
buffered data are sent on the fly to the RS232 module output.
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RF54
User Guide
Power management : low power mode
The low power mode is managed with the S232 register and the STANDBY
pin (5).
Before the activation of the power down mode (ATS232=1<cr>) be sure that
the STANDBY pin is pulled to GND in order to keep the module in active
mode.
To enable the low power mode S232 register must be set to 1
(ATS232=1<cr>).
To enter in low power mode the STANDBY pin must be pulled to VCC.
To exit the low power mode the STANDBY pin must be pulled to GND.
To disable the low power mode S232 register must be set to 0
(ATS232=0<cr>). The STANDBY pin is not managed.
AT Commands
Description
AT commands are interpreted only when the transceiver is in
Command mode.
Command : are used to read and update the modem parameters
•A command starts with the 2 ASCII ‘AT’ characters. ‘AT’ means
‘Attention’ follow with one or several characters or other data.
•Each command is ended with <cr> (carriage return).
Response: is sent back for each command on the serial link. The answer is:
•‘O’<cr> (ASCII character 0x4F) for accepted command (or OK
command)
•‘E’<cr> for error
•Specific string when specified
If the code pin is activated you must enter it using AT command
ATPWD (see below) to be allowed to use other AT commands.
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Set of commands
Commands Description
Operating mode selection
ATO Return back to transceiver mode.
<silence>+++<silence> Command mode activation. The +++ sequence must be preceded
and followed by a calibrated silence (no other character)
Registers management
ATSn? Displays the Sn register content where n represents the register
number.
The response has the following format:
Sn=y<cr><lf>
ATSn=m Sets the Sn register value with ‘m’. n represents the register number..
AT&W Saves the new register configuration in EEPROM. Each time you
switch on the modem, the EEPROM configuration will be loaded in the
modem registers.
AT/S Displays all register values. The response has the following format:
Sxxx=y<cr><lf> for each register.
AT/V Software version display. The response has the following format:
Adeunis RF Versatile Modem II 915 MHz 500mW Vxx.yy<cr><lf>
ATR Restore the register default values
ATPWD=m m = pin code (register S205) : unlock all AT commands.
m = 0000 : set registers to default value and unlock all AT
commands.
Test modes
ATT1 Pure Carrier (data=0) transmission using current channel. The output
of this mode is achieved by reception of any character on the serial
link.
ATT2 Pure Carrier (data=1) transmission using current channel. The output
of this mode is achieved by reception of any character on the serial
link.
ATT3-ATT6 Modulation using current channel. The output of this mode is achieved
by reception of any character on the serial link.
ATT3: 0.9 KHz modulation
ATT4: 3.6 KHz modulation
ATT5: 14.4 KHz modulation
ATT6: 28.8 KHz modulation
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Register description
The register value could be updated using the ATSn=m<cr> command and
displayed using ATSn?<cr> command.
At power-up, the previous transceiver configuration is restored from E2PROM
(non volatile) to RAM. The registers are located in RAM registers, any
modification is performed on RAM registers: To save current register
configurations, it is necessary to use the AT&W<cr> command (If not, the
updated parameters are lost in case of power shortage).
The registers are shared in 2 types : read only (R) or read/write (R/W)
It is mandatory that the Master modem and the Slave modem have
exactly the same registers configuration in term of : hopping table
(S200), start channel (S201), channel type (S202), serial
parameters (S210, S211, S212, S213), handshake (S216), protocol
(S220) and packet retries (S221).
It is recommended to have the same RF OUT level (S231).
Type Register Function Description Default
value Note
Radio management
R/W S200 Hopping table Hopping table
Default table 4
R/W S201 Start channel Start channel number for hopping table 0
R/W S202 Channel type Channel type configuration
0 : Narrow band (10 kbps)
1 : Wide band (57.6 kbps)
1 2
When leaving factory, this product is set up in Narrow Band to optimize the range
R S230 RSSI level Displays the reception level of the latest
received message.
Response: S230=-xxx dBm<cr><lf> with
xxx decimal value
The RSSI values range from –115 up to –
60 dBm.
None
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RF54
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Type Register Function Description Default
value Note
R/W S231 RF OUT level Adjusts the RF out level
0 => 20 dBm (100 mW)
1 => 23 dBm (200 mW)
2 => 24,5 dBm (<450 mA for USB power
supply)
3 => 27 dBm (500 mW)
3
Serial link
R/W S210 Baudrate Serial link rate in bits/s
‘1’: 1 200
‘2’: 2 400
‘3’: 4 800
‘4’: 9 600
‘5’: 19 200
‘6’: 38 400
‘7’: 57 600
4 1,2,
3
R/W S211 Data length ‘7’ : 7 bits
‘8’ : 8 bits
8 2,3
R/W S212 Parity ‘1’ : none
‘2’ : even
‘3’ : odd
1 2,3
R/W S213 Stop bits ‘1 ‘ : 1 stop bit
‘2 ‘ : 2 stop bits
1 2,3
R/W S214 Command
timeout Time out duration for detecting the +++ pattern, unit 10ms. From 1(10ms) up to
100 (1s).
8 1
R/W S215 Interface type ‘0’ : RS232 only
‘1’ : RS232 or RS485 (managed DE/RE
lines) (RS485 if pin 6 tied to ground)
1
R/W S216 Handshake ‘0’ : hardware RTS mandatory if packet
retries register S221 =1 or 2.
‘2’ : none
2 2
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