Wurth Elektronik Telesto-II User manual

USER MANUAL
TELESTO-II
AMB9626 / 2607021191010
VERSION 2.4
MAY 19, 2023

***************
MUST READ
Check for firmware updates
Before using the product make sure you use the most recent firmware version, data sheet
and user manual. This is especially important for Wireless Connectivity products that were
not purchased directly from Würth Elektronik eiSos. A firmware update on these respective
products may be required.
We strongly recommend to include in the customer system design, the possibility for a firmware
update of the product.

WIRELESS CONNECTIVITY & SENSORS
User manual Telesto-II
Revision history
Manual
version
FW
version
HW
version Notes Date
1.0 -
1.6
1.0.0 -
1.1.0 2.0 • Initial version April 2018
2.0 1.1.0 2.0 • New corporate design and structure November
2018
2.1 1.1.0 2.0
• Added chapter Reference design
• Added chapter Information for
explosion protection
February
2019
2.2 1.1.0 2.0
• Corrected examples in
chapter UART_Baudrate
• Updated label in chapter General
labeling information
• Updated address of Division Wireless
Connectivity & Sensors location
October
2019
2.3 1.1.0 2.0 • Updated firmware update chapter June 2020
2.4 1.1.0 2.0
• Removed 2607021191019 from Ordering
information as there are no longer
pre-cuts available. The modules are
available in all quantities as cut tape
• New corporate design
May 2023
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Abbreviations
Abbreviation Name Description
ACK Acknowledgement Acknowledgement pattern confirming the reception of
the transmitted data packet.
CS Checksum
DC Duty cycle Transmission time in relation of one hour. 1% means,
channel is occupied for 36 seconds per hour.
FHSS
Frequency
Hopping Spread
Spectrum
One of the radio options for 915 MHz band, according
to FCC and IC regulatorys
FSE Field Sales
Engineer
0xhh [HEX] Hexadecimal
All numbers beginning with 0x are stated as
hexadecimal numbers. All other numbers are
decimal.
HIGH High signal level
LOW Low signal level
LPM Low power mode Operation mode for reduced power consumption.
LSB Least significant
bit
MSB Most significant bit
PL Payload The real, non-redundant information in a
frame/packet.
RF Radio frequency Describes everything relating to the wireless
transmission.
UART
Universal Asynchronous Receiver Transmitter allows
communicating with the module of a specific
interface.
US UserSettings
Any relation to a specific entry in the UserSettings is
marked in a special font and can be found in the
respective chapter.
VDD Supply voltage
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Contents
Overview of helpful application notes 8
1. Introduction 9
1.1. Operational description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.2. Blockdiagram..................................... 10
1.3. Orderinginformation................................. 10
2. Electrical specifications 11
2.1. Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.3. Powerconsumption.................................. 12
2.3.1. Static..................................... 12
2.4. Radiocharacteristics................................. 13
2.5. Pincharacteristics .................................. 13
2.6. Integrated flash characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3. Pinout 14
4. Quickstart 16
4.1. Minimal pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2. Powerup ....................................... 16
4.3. Quickstartexample.................................. 17
5. Functional description 18
5.1. Operatingmodes................................... 18
5.1.1. Switching from transparent to command mode . . . . . . . . . . . . . . 18
5.1.2. Switching from command to transparent mode . . . . . . . . . . . . . . 18
5.1.3. Transparentmode.............................. 19
5.1.3.1. /RTS signal, busy processor . . . . . . . . . . . . . . . . . . . . . . 19
5.1.4. Commandmode .............................. 20
5.2. Adopting parameters to fit your application . . . . . . . . . . . . . . . . . . . . . 20
5.3. Device addressing and wireless monitoring . . . . . . . . . . . . . . . . . . . . 20
6. Host connection 22
7. The command interface 23
7.1. Data transfer & reception in the command mode . . . . . . . . . . . . . . . . . 23
7.1.1. CMD_DATA_REQ.............................. 23
7.1.2. CMD_DATAEX_REQ ............................ 24
7.1.3. CMD_DATAEX_IND............................. 25
7.2. Requesting parameters and actions . . . . . . . . . . . . . . . . . . . . . . . . 25
7.2.1. CMD_FWRELEASE_REQ . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.2.2. CMD_SERIALNO_REQ . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7.2.3. CMD_RESET_REQ............................. 26
7.2.4. CMD_RSSI_REQ.............................. 27
7.2.5. CMD_ERRORFLAGS_REQ . . . . . . . . . . . . . . . . . . . . . . . . 27
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7.3. Modification of volatile parameters . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.3.1. CMD_SET_MODE_REQ . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.3.2. CMD_SET_PAPOWER_REQ . . . . . . . . . . . . . . . . . . . . . . . 28
7.3.3. CMD_SET_DESTNETID_REQ . . . . . . . . . . . . . . . . . . . . . . 28
7.3.4. CMD_SET_DESTADDR_REQ . . . . . . . . . . . . . . . . . . . . . . . 29
7.4. Modification of non-volatile parameters . . . . . . . . . . . . . . . . . . . . . . . 29
7.4.1. CMD_SET_REQ .............................. 29
7.4.2. CMD_GET_REQ .............................. 31
7.4.3. CMD_FACTORY_RESET_REQ . . . . . . . . . . . . . . . . . . . . . . 31
8. UserSettings - Module configuration values 32
8.1. Difference between volatile and non-volatile settings . . . . . . . . . . . . . . . 32
8.2. Modifying the UserSettings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
8.3. UART_PktMode.................................... 35
8.3.1. Example1:.................................. 35
8.3.2. Example2:.................................. 35
8.4. UART_PktSize .................................... 37
8.4.1. Example1:.................................. 37
8.4.2. Example2:.................................. 37
8.5. UART_RTSLimit ................................... 38
8.5.1. Example1:.................................. 38
8.5.2. Example2:.................................. 38
8.6. UART_ETXChar ................................... 39
8.6.1. Example1:.................................. 39
8.6.2. Example2:.................................. 39
8.7. UART_Timeout.................................... 40
8.7.1. Example1:.................................. 40
8.7.2. Example2:.................................. 40
8.8. UART_DIDelay .................................... 41
8.8.1. Example1:.................................. 41
8.8.2. Example2:.................................. 41
8.9. MAC_NumRetrys................................... 42
8.9.1. Example1:.................................. 42
8.9.2. Example2:.................................. 42
8.10. MAC_AddrMode ................................... 43
8.10.1.Example1:.................................. 43
8.10.2.Example2:.................................. 44
8.11. MAC_DefaultDestNetID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
8.11.1.Example1:.................................. 45
8.11.2.Example2:.................................. 45
8.12. MAC_DefaultDestAddrLSB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
8.12.1.Example1:.................................. 46
8.12.2.Example2:.................................. 46
8.13. MAC_DefaultSourceNetID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
8.13.1.Example1:.................................. 47
8.13.2.Example2:.................................. 47
8.14. MAC_DefaultSourceAddrLSB . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
8.14.1.Example1:.................................. 48
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8.14.2.Example2:.................................. 48
8.15. MAC_ACKTimeout.................................. 49
8.15.1.Example1:.................................. 49
8.15.2.Example2:.................................. 49
8.16. PHY_PAPower .................................... 50
8.16.1.Example1:.................................. 50
8.16.2.Example2:.................................. 50
8.17. PHY_LongPreambleTimeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
8.17.1.Example1:.................................. 52
8.17.2.Example2:.................................. 52
8.18. PHY_RSSIThreshold................................. 54
8.18.1.Example1:.................................. 54
8.18.2.Example2:.................................. 55
8.19. OpMode........................................ 56
8.19.1.Example1:.................................. 56
8.19.2.Example2:.................................. 56
8.20. CfgFlags........................................ 57
8.20.1.Example1:.................................. 58
8.20.2.Example2:.................................. 58
8.21. UART_Baudrate ................................... 59
8.21.1.Example1:.................................. 59
8.21.2.Example2:.................................. 59
8.22. UART_Databits.................................... 61
8.22.1.Example1:.................................. 61
8.22.2.Example2:.................................. 61
8.23. UART_Parity ..................................... 62
8.23.1.Example1:.................................. 62
8.23.2.Example2:.................................. 62
8.24. UART_Stoppbits ................................... 64
8.24.1.Example1:.................................. 64
8.24.2.Example2:.................................. 64
8.25. RF_ConfigIndex ................................... 65
8.25.1.Example1:.................................. 65
8.25.2.Example2:.................................. 65
9. Timing parameters 66
9.1. Resetbehavior .................................... 66
9.1.1. Power-onreset ............................... 66
9.1.2. Reset via /RESET pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
9.1.3. Reset as result of a serious error condition . . . . . . . . . . . . . . . . 66
9.2. Latencies when leaving the LPM . . . . . . . . . . . . . . . . . . . . . . . . . . 66
9.3. Latencies during data transfer / packet generation . . . . . . . . . . . . . . . . . 66
10.Radio parameters 68
11.Battery powered operation 70
11.1. Activemode...................................... 70
11.2. Stand-bymode .................................... 70
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12.Custom firmware 71
12.1. Custom configuration of standard firmware . . . . . . . . . . . . . . . . . . . . 71
12.2. Customer specific firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
12.3. Customerfirmware.................................. 71
12.4. Contact for firmware requests . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
13.Firmware updates 73
13.1. Firmware flashing using the production interface . . . . . . . . . . . . . . . . . 73
13.2. Update via ACC Software and UART . . . . . . . . . . . . . . . . . . . . . . . . 73
14.Firmware history 75
15.Design in guide 76
15.1. Advice for schematic and layout . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
15.2. Dimensioning of the micro strip antenna line . . . . . . . . . . . . . . . . . . . . 78
15.3. Antennasolutions .................................. 79
15.3.1.Wireantenna ................................ 80
15.3.2.Chipantenna ................................ 80
15.3.3.PCBantenna ................................ 80
15.3.4. Antennas provided by Würth Elektronik eiSos . . . . . . . . . . . . . . 81
15.3.4.1. 2600130081 - Hyperion-I - 868 MHz dipole antenna . . . . . . . . 81
15.3.4.2. 2600130083 - Hydra-I - 915 MHz dipole antenna . . . . . . . . . . 82
16.Reference design 83
16.1. Schematic....................................... 84
16.2. Layout......................................... 86
17.Manufacturing information 87
17.1. Moisture sensitivity level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
17.2. Soldering ....................................... 87
17.2.1.Reflowsoldering .............................. 87
17.2.2.Cleaning................................... 89
17.2.3. Potting and coating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
17.2.4.Othernotations ............................... 89
17.3. ESDhandling..................................... 90
17.4. Safety recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
18.Physical specifications 92
18.1. Dimensions...................................... 92
18.2. Weight......................................... 92
18.3. Moduledrawing.................................... 93
18.4. Footprint........................................ 94
18.5. Antennafreearea .................................. 94
19.Marking 95
19.1. Lotnumber ...................................... 95
19.2. General labeling information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
20.Information for explosion protection 97
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21.Regulatory compliance information 98
21.1. ImportantnoticeFCC ................................ 98
21.2. Conformity assessment of the final product . . . . . . . . . . . . . . . . . . . . 98
21.3. Exemptionclause................................... 98
21.4. EU Declaration of conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
21.5. FCC Compliance Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
21.6. IC Compliance Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
21.7. FCC and IC requirements to OEM integrators . . . . . . . . . . . . . . . . . . . 99
22.Important notes 101
22.1. General customer responsibility . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
22.2. Customer responsibility related to specific, in particular safety-relevant appli-
cations.........................................101
22.3. Best care and attention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
22.4. Customer support for product specifications . . . . . . . . . . . . . . . . . . . . 101
22.5. Productimprovements................................102
22.6. Productlifecycle ...................................102
22.7. Propertyrights ....................................102
22.8. General terms and conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
23.Legal notice 103
23.1. Exclusionofliability..................................103
23.2. Suitability in customer applications . . . . . . . . . . . . . . . . . . . . . . . . . 103
23.3. Trademarks ......................................103
23.4. Usagerestriction ...................................103
24.License terms 105
24.1. Limitedlicense ....................................105
24.2. Usageandobligations ................................105
24.3. Ownership.......................................106
24.4. Firmwareupdate(s)..................................106
24.5. Disclaimer of warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
24.6. Limitationofliability..................................107
24.7. Applicable law and jurisdiction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
24.8. Severabilityclause ..................................107
24.9. Miscellaneous.....................................107
A. Additional CRC8 Information 109
A.1. Example CRC8 Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
A.2. CRC8TestVectors..................................109
B. Example codes for host integration 110
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Overview of helpful application notes
Application note ANR008 - Wireless Connectivity Software Development Kit
http://www.we-online.com/ANR008
To ease the integration of the Würth Elektronik eiSos radio modules into an application, Würth
Elektronik eiSos offers the corresponding Software Development Kit (SDK) for most commonly
used host processors. This SDK contains drivers and examples in C-code to communicate
with the corresponding radio module. This application note shows which SDKs are available
and describes how to download and use them.
Application note ANR010 - Range estimation
http://www.we-online.com/ANR010
This application note presents the two most used mathematical range estimation models, Friis
and two ray ground reflection, and its implementation in the range estimation tool of the RED-
EXPERT.
Application note ANR015 - From 868 MHz To 915 MHz
http://www.we-online.com/ANR015
Due to radio regulation laws in Europe and North America different frequencies are used in
the sub-GHz range for radio data transmission. Therefore Würth Elektronik eiSos offers each
product operating in the European 868 MHz range an counterpart operating in the American
915 MHz range. This application note shows which modules are comparable, where they differ
and what to consider when switching from 868 to 915 MHz and vice versa.
Application note ANR016 - Radio module migration guide
http://www.we-online.com/ANR016
Due to our long term availability policy Würth Elektronik eiSos offers beside radio modules
with most recent technology and chipset still the predecessor modules. This application note
describes what to consider when switching in between module generations.
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1. Introduction
1.1. Operational description
The Telesto-II was designed as a radio sub module for wireless communication between de-
vices such as control systems, remote controls, sensors etc. It offers several addressing modes
and relieves the host system of radio-specific tasks such as
• checksum calculation,
• address resolution, and
• repetition of unacknowledged telegrams.
They can be deployed wherever the comparatively rare wireless exchange of small data pack-
ets between two or more parties is required. The asynchronous Frequency Hopping (FHSS)
used in Telesto-II has some specific requirements that needs to be taken into account when
setting up a network by adopting the module’s configuration parameters.
A serial interface (UART) whose data rate and format can be adjusted flexibly is available
for communicating with the host system.
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1.2. Block diagram
Figure 1: Block diagram
1.3. Ordering information
WE order code Former order code Description
2607021191010 AMB9626 Radio module 915MHz, FHSS
2607029291011 AMB9626-EV Evaluation kit including evaluation board and USB
dongle
Table 1: Ordering information
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2. Electrical specifications
As not otherwise stated measured on the evaluation board for Telesto-II with T = 25°C, VCC =
3.3 V, internal DC-DC converter active and 50 Ωconducted.
2.1. Recommended operating conditions
Description Min. Typ. Max. Unit
Ambient temperature -40 25 85 °C
Supply voltage (VDDS) 2.0 3.0 3.6 V
Table 2: Recommended operating conditions
2.2. Absolute maximum ratings
Description Min. Typ. Max. Unit
VCC -0.3 3.9 V
Level at any module IO pin -0.3 VCC+0.3, max 3.9 V
Output RF level 14 dBm
Input RF level 10 dBm
Table 3: Absolute maximum ratings
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2.3. Power consumption
As a voltage regulator is integrated, the current consumption is strongly de-
pending on the supplied voltage level and stability.
The transmit and receive currents are depending on the impedance matching,
and therefore may vary depending on antenna selection and matching.
A stable power supply is indispensable to ensure valid operating conditions for
the module. Releasing the /RESET pin before the VCC is stable may damage
the module permanently.
A stable power supply and proper antenna design and matching is indispens-
able to achieve the stated radio characteristics.
2.3.1. Static
The stated current consumption is the sum of the CPU current and the radio current, depending
on the active radio mode.
Conditions: Telesto-II-EV with T = 25 °C, VCC = 3.3 V, terminated unused module pads and
50 Ωconducted.
Description Min Typ. Max Unit
TX current consumption at max
output power 53 mA
RX current consumption 30 mA
Low power (LPM3), radio off,
UART via ACLK 3 µA
Table 4: Power consumption
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2.4. Radio characteristics
Conditions: Telesto-II-EV, T = 25 °C, VCC = 3.0 V, terminated unused module pads, 50 Ω
conducted.
The user configurable PHY_RSSIThreshold value (default = 10 dB) must be taken into account
for any range consideration as it reduces the link budged by the configured value.
Description Min Typ. Max Unit
Max output power 14 14 dBm
Best input sensitivity -99 dBm
Frequencies 902.5 927.5 GHz
Table 5: Radio characteristics
2.5. Pin characteristics
Property Min Typ. Max Unit
GPIO maximum current per pin 2 mA
GPIO maximum current over all 48 mA
Internal pull-up resistor 20 35 50 kΩ
Internal Pull-down resistor 20 35 50 kΩ
Table 6: Pin characteristics
2.6. Integrated flash characteristics
The integrated flash memory has only a limited number cycles. This number of flash cycles
has a guaranteed min. value of 10000 and a typical value of 100000.
Hosts shall implement methods to prevent their applications from excessively using flash cy-
cles. This can be achieved by always performing a CMD_GET_REQ before any CMD_SET_REQ and
other command that uses flash cycles.
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3. Pinout
GND
/RESET
RX_IND
TX_IND
/CTS
/DATA_IND
/RTS
URXD
VCC
ANT
UTXD
112
13
23
TRX_DIS
/CONFIG
/DATA_REQ
GND
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED RESERVED
Figure 2: Pinout
No Designation I/O Description
1ANT I/O Antenna connection, 50Ω
2GND Supply Ground
3VCC Supply Supply voltage
4UTXD Output UART TX (module transmission)
5URXD Input UART RX (module reception)
6/RTS Output
UART ready to send. HIGH level signalizes a busy
module UART buffer. While HIGH, all received
UART bytes will be discarded.
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7/CTS Input
UART clear to send. HIGH signal indicates host
busy. Disabled by default.
If the pin function is disabled, connect it to
GND.
8/DATA_IND Output
Packet receive indication. Goes LOW as soon as a
valid packet with correct address is received via
radio, stays LOW for and additional UART_DIDelay
and remains LOW as long as the output via UART
continues.
9RESERVED Output Reserved. Do not connect.
10 RESERVED Output Reserved. Do not connect.
11 /DATA_REQ Input
A falling edge triggers the wireless transmission of
buffered data (transparent OpMode only). When
enabled this pin uses an internal pull-up resistor.
Can be disabled by CfgFlags .
If the pin function is disabled, connect it to
GND.
12 RESERVED Output Reserved. Do not connect.
13 RESERVED Output Reserved. Do not connect.
14 TRX_DIS Input
Switches the radio receive function off when a
HIGH level is applied.
The pin level must be hold LOW during the
module boot up.
Connect to GND if not needed.
15 /CONFIG Input
Switch the module’s OpMode on a falling edge
detection. Can be disabled by CfgFlags .
Connect to GND if function is disabled.
16 RESERVED Output Reserved. Do not connect.
17 RESERVED Output Reserved. Do not connect.
18 RESERVED Output Reserved Do not connect.
19 /RESET Input
Module internal pull-up, a rising edge will release
module from reset, LOW will hold module in reset
state.
20 TX_IND Output Shows radio activity, HIGH on radio TX. Can be
enabled by CfgFlags .
21 RX_IND Output Shows radio activity, HIGH on radio RX. Can be
enabled by CfgFlags .
22 RESERVED Output Reserved. Do not connect.
23 GND Supply Ground
Table 7: Pinout
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4. Quickstart
4.1. Minimal pin configuration
In the factory state, the modules are immediately ready for operation; the following pins are
required in the minimal configuration: VCC,GND,UTXD, and URXD.
If the module has to be connected to a PC, an adapter (TTL to RS-232 or TTL to USB) has to
be used. The Telesto-II-EV is suited for this.
In the default configuration all module inputs (TRX_DIS and /CONFIG) are activated and must
be connected as shown in table 7 . If the function of the /DATA_REQ pin is enabled (see chap-
ter 8.20 ), this pin has an internal pull-up resistor.
If TRX_DIS is used by the host it must be set to GND during start-up / after
reset till the module’s start-up is completed. The module will wait for this pin
to go to GND level before finishing its start-up procedure. The module’s UART
or function pins (such as /CONFIG) will not be available until the start-up is
finished.
4.2. Power up
Conditon: ∆t > 2ms.
Figure 3: Power up
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4.3. Quickstart example
Sending and receiving: Hello World
Connect your pair of modules, EV-boards or USB-sticks with the PC as explained in chap-
ter 4.1 . Please make sure you have a minimum distance of 3 meters between the two modules
or devices to avoid over modulation. The module’s firmware is very sensitive to over modula-
tion due to the active channel detection algorithm that is used due to the need for frequency
hopping. When short distances are needed, you could reduce the transmission power to a
minimum.
When the connection to the PC is done, please use a terminal tool of your choice. For conve-
nience we assume you selected the tool "hterm". Select the two corresponding COM ports and
open them with a configuration of 9600 Baud, 8 Data bits, 1 Stop bit and Parity set to None.
Enter the string "Hello World" into the input line of hterm and use the "ASend" button followed
by pushing the "start" button to send the data once.
This data will be received by the second module and shows up as received data in the second
hterm instance. You may send any string of size 1 to 120 characters from one module to the
other.
You just used the so called "transparent mode" of the modules to send your data. The address
mode that was used is "0". Thus all radio frames are broadcasts that can be received by any-
one listening with an Telesto-II in default settings. The frame you sent was generated using the
timeout method.
Due to the frequency hopping that is needed for 915 MHz FCC compliance, the amount of
data that can be send and received per time is limited. A minimum delay of 100ms between 2
frames shall be implemented.
Besides the transparent mode, that is suited for transparent data transmission, the so called
"command mode" allows both, the module configuration and the data transmission, using a
predefined command interface (see chapter 7 ).
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5. Functional description
5.1. Operating modes
The Telesto-II can be used in the following operating modes:
1. Transparent mode (transparent data transmission)
2. Command mode (module configuration and data transmission using the predefined com-
mand interface)
The operating mode after power-up can be configured by means of the OpMode parameter. By
default, the module operates in transparent mode.
Starting in the command mode, the module responds with a CMD_SET_MODE_CNF telegram.
5.1.1. Switching from transparent to command mode
The command mode can be entered by applying a falling edge on the /CONFIG pin. The de-
tection of the falling edge on the /CONFIG pin can be disabled using the user setting CfgFlags .
The successful switchover is acknowledged by a CMD_SET_MODE_CNF (0x02 0x44 0x01 0x10
0x57) telegram indicating command mode.
The switchover can only occur when no data is being received by wireless transmission or
UART interface (approximately 100 µs after /RTS goes low and indicates readiness).
5.1.2. Switching from command to transparent mode
The transparent mode can be entered by applying a falling edge on the /CONFIG pin or by
using the command CMD_SET_MODE_REQ . The detection of the falling edge on the /CONFIG pin
can be disabled using the user setting CfgFlags .
The successful switchover is acknowledged by a CMD_SET_MODE_CNF telegram indicating trans-
parent mode.
The switchover can only occur when no data is being received by wireless transmission or
UART interface (approximately 100 µs after /RTS goes low and indicates readiness).
Recommendation: Automatic switching to a specific mode can be real-
ized by applying falling edges on the /CONFIG pin as long as the needed
CMD_SET_MODE_CNF is returned:
• 0x02 0x44 0x01 0x10 0x57 telegram indicating command mode
• 0x02 0x44 0x01 0x00 0x47 telegram indicating transparent mode
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