Table of Contents
Related Manuals for RFM DNT24C
Summary of Contents for RFM DNT24C
- Page 1 DNT24 Series 2.4 GHz Spread Spectrum Wireless Transceivers Integration Guide www.RFM.com Technical support +1.678.684.2000 Page 1 of 83 © 2011 by RF Monolithics, Inc. E-mail: tech_sup@rfm.com DNT24 Integration Guide - 10/19/11...
- Page 2 Important Regulatory Information RFM Product FCC ID: HSW-DNT24 IC 4492A-DNT24 Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable pro- tection against harmful interference in a residential installation.
- Page 3 See Section 6.8 of this manual for regulatory notices and labeling requirements. Changes or modifica- tions to a DNT24 not expressly approved by RFM may void the user’s authority to operate the module. www.RFM.com Technical support +1.678.684.2000...
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Page 4: Table Of Contents
Mounting and Enclosures......................31 Labeling and Notices....................... 32 DNT24 Protocol-formatted Messages ................... 33 Protocol Formats ........................33 Message Types ........................33 Message Format Details ......................34 www.RFM.com Technical support +1.678.684.2000 Page 4 of 83 © 2011 by RF Monolithics, Inc. E-mail: tech_sup@rfm.com... - Page 5 Technical Support ........................75 10.3 DNT24 Mechanical Specifications ..................76 10.4 DNT24 Development Board Schematic .................. 80 11.0 Warranty ............................83 www.RFM.com Technical support +1.678.684.2000 Page 5 of 83 © 2011 by RF Monolithics, Inc. E-mail: tech_sup@rfm.com DNT24 Integration Guide - 10/19/11...
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Page 6: Dnt24 Introduction
This allows the signal to be reconstructed even though part of it may be lost or corrupted in transmission. www.RFM.com Technical support +1.678.684.2000 Page 6 of 83 ©... -
Page 7: Frequency Hopping Versus Direct Sequence
Forms of spread spectrum - direct sequence and frequency hopping Figure 1.1.2 www.RFM.com Technical support +1.678.684.2000 Page 7 of 83 © 2011 by RF Monolithics, Inc. -
Page 8: Dnt24 System Overview
Point-to-point systems are also used to transmit switch positions or analog signals from one location to another. Figure 2.1.1 www.RFM.com Technical support +1.678.684.2000 Page 8 of 83 © 2011 by RF Monolithics, Inc. -
Page 9: Point-To-Multipoint Systems
The trade-off in store-and-forward systems is longer delivery times due to receiving and retransmitting a message several times. Store-and-forward systems are especially useful in applica- tions such as agriculture where data is only collected periodically. www.RFM.com Technical support +1.678.684.2000 Page 9 of 83 ©... -
Page 10: Rf Channel Access
If the parent successfully receives the transmission, it includes the child’s MAC address in www.RFM.com Technical support +1.678.684.2000 Page 10 of 83 ©... -
Page 11: Dnt24 Addressing
The cycled parameters are col- lected by child radios, allowing them to register with a parent, and to later follow any control parameter www.RFM.com Technical support +1.678.684.2000 Page 11 of 83 ©... -
Page 12: Fast Linking Techniques
Protocol-formatted messages are discussed in detail in Section 7. Briefly, protocol-formatted messages include a start-of-messages character, message length and message type information, the destination address of the message, and the message payload. www.RFM.com Technical support +1.678.684.2000 Page 12 of 83 ©... -
Page 13: Dnt24 Application Interfaces
P e r i p h e r a l D N T 9 0 0 S C L K / S S Figure 3.2.1 www.RFM.com Technical support +1.678.684.2000 Page 13 of 83 © 2011 by RF Monolithics, Inc. E-mail: tech_sup@rfm.com... - Page 14 D N T 9 0 / H O S T _ R T S / H O S T _ C T S D A V Figure 3.2.3 www.RFM.com Technical support +1.678.684.2000 Page 14 of 83 © 2011 by RF Monolithics, Inc. E-mail: tech_sup@rfm.com...
- Page 15 L e n g t h B y t e 0 x F B S t a r t o f M e s s a g e Figure 3.2.5 www.RFM.com Technical support +1.678.684.2000 Page 15 of 83 © 2011 by RF Monolithics, Inc.
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Page 16: Digital I/O
The DAC settings have 12-bit resolution. There are two options for the DAC full-scale reference: 1. The DNT24 regulated supply voltage, about 3.3 V www.RFM.com Technical support +1.678.684.2000 Page 16 of 83 © 2011 by RF Monolithics, Inc. -
Page 17: I/O Event Reporting And I/O Binding
Write-only parameters include security keys and certain action triggers such as reset. Incorrectly configuring certain parameters can disable a module’s radio link, but the configuration can always be corrected through the serial port. The organization of the www.RFM.com Technical support +1.678.684.2000 Page 17 of 83 ©... -
Page 18: Configuring A Basic Point-To-Point System
Most applications will require only a few of these parameters be changed from their default values. But for those applications that need them, RFM recommends the following con- figuration sequence. Skip the configuration steps where the default parameter value is satisfactory. - Page 19 The parameter that controls this number is MsgsPerHop in Bank 4. The default is 8 mes- sages. b. Load the required base slot size into the BaseSlotSize parameter, Bank 1, in the base. The default is 40 bytes. www.RFM.com Technical support +1.678.684.2000 Page 19 of 83 © 2011 by RF Monolithics, Inc.
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Page 20: Configuring A Store-And-Forward System
(child routers picking each other as a parent cannot occur). In this case, the AltParent-NwkID parameter should be set to 0xFF, which disables it. www.RFM.com Technical support +1.678.684.2000 Page 20 of 83 ©... -
Page 21: Slot Buffer Sizes, Number Of Slots, Messages Per Hop And Hop Duration
The slot size depends on the current values of the following parameters: - base slot size - hop duration - number of slots in a frame www.RFM.com Technical support +1.678.684.2000 Page 21 of 83 © 2011 by RF Monolithics, Inc. - Page 22 The NumSlots parameter can be set to one for a point-to-point sys- tem, as there is only one child radio. The NumSlots parameter can be set to allow up to eight children to www.RFM.com Technical support +1.678.684.2000 Page 22 of 83 ©...
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Page 23: Dnt24 Application Interface Configuration
SpiMasterCmdLen parameters respectively in Bank 3. 3. Configure the edge trigger direction, bit-sampling edge and bit-order options by setting the SpiOptions parameter in Bank 3. www.RFM.com Technical support +1.678.684.2000 Page 23 of 83 © 2011 by RF Monolithics, Inc. -
Page 24: Configuring Digital I/O
ADC1 to ADC0 differential measurement is compared to the “0” high and low thresh- olds, and the ADC2 to ADC0 differential measurements is compared to the “1” high and low thresholds. In this case the “2” threshold values are not used. www.RFM.com Technical support +1.678.684.2000 Page 24 of 83 ©... -
Page 25: Configuring I/O Event Reporting And I/O Binding
The ADC and DAC channels are factory calibrated. It may be desirable to fine tune these calibrations after the DNT24 has been integrated with the customer’s hardware in some applications. For analog calibration support, contact RFM technical support. 5.5 Configuring I/O Event Reporting and I/O Binding 1. - Page 26 ACK, processing a message addressed to it, or receiving a serial or SPI message by setting the Wake-ResponseTime parameter. The default response time is 500 ms. Note that the setting of this parameter is overridden by some GpioEdgeTrigger parameter settings. www.RFM.com Technical support +1.678.684.2000 Page 26 of 83 ©...
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Page 27: Dnt24 Hardware
There are four module configurations in the DNT24 Series: - The DNT24C is designed for use with an external antenna and for solder reflow mounting. - The DNT24P is designed for use with an external antenna and for plug-in connector mounting. -
Page 28: Electrical Specifications
Modulation RF Data Transmission Rate kbps Receiver Sensitivity, 10 -100 Transmitter RF Output Power 10 or 63 Optimum Antenna Impedance, DNT24C and DNT24P RF Connection, DNT24C and DNT24P U.FL Connector Point-to-Point, Point-to-Multipoint, Network Topologies Peer-to-Peer and Store-and-Forward Access Scheme Ad Hoc TDMA... -
Page 29: Module Pin Out
6.2 Module Pin Out Electrical connections to the DNT24C are made through the I/O pads and through the I/O pins on the DNT24P. The hardware I/O functions are detailed in the table below: Name Description Power supply and signal ground. Connect to the host circuit board ground. -
Page 30: Antenna Connector
For FR-4 type circuit board materials (dielectric constant of 4.7), the width of the stripline is equal to 1.75 times the thickness of the circuit board. Note that other cir- www.RFM.com Technical support +1.678.684.2000 Page 30 of 83 ©... -
Page 31: Power Supply And Input Voltages
Figure 6.6.1 6.7 Mounting and Enclosures DNT24C and DNT24CA radio modules are mounted by reflow soldering them to a host circuit board. DNT24P and DNT24PA modules are mounted by plugging their pins into a set of mating connectors on the host circuit board. Refer to Section 8.3 for DNT24P connector details. -
Page 32: Labeling And Notices
Contains FCC ID: HSW-DNT24 Contains IC: 4492A-DNT24 RFM (Insert Model Designation DNT24C, DNT24CA, DNT24P or DNT24PA depending on the model used): This device complies with Part 15 of the FCC Rules. Operation is subject to the following two con- ditions: (1) This device may not cause harmful interference, and (2) this device must accept any interfer- ence received, including interference that may cause undesired operation. -
Page 33: Dnt24 Protocol-Formatted Messages
0x20 in the high nibble of the type byte. If multiple arguments are to be provided, they are to be concate- nated in the order shown in Section 7.3 below. Little-Endian byte order is used for all multi-byte www.RFM.com Technical support +1.678.684.2000 Page 33 of 83 ©... -
Page 34: Message Format Details
Length 0x01 = Number of bytes in message following this byte 0x02 Packet Type 0x10 = EnterProtocolModeReply Table 7.3.3 www.RFM.com Technical support +1.678.684.2000 Page 34 of 83 © 2011 by RF Monolithics, Inc. E-mail: tech_sup@rfm.com DNT24 Integration Guide - 10/19/11... - Page 35 Register bank number 0x05 Register Size Register size in bytes, only one parameter at a time (wrong register size will produce an error response) Table 7.3.7 www.RFM.com Technical support +1.678.684.2000 Page 35 of 83 © 2011 by RF Monolithics, Inc. E-mail: tech_sup@rfm.com...
- Page 36 Destination MAC address, in Little Endian byte order 0x06 - 0x72 Tx Data Up to 109 bytes of data to Base, or 105 bytes from Base Table 7.3.11 www.RFM.com Technical support +1.678.684.2000 Page 36 of 83 © 2011 by RF Monolithics, Inc. E-mail: tech_sup@rfm.com...
- Page 37 Register value, all bytes in the register (only one parameter at a time) *Bytes eight through the end of the message will not be returned in case of an error Table 7.3.14 www.RFM.com Technical support +1.678.684.2000 Page 37 of 83 ©...
- Page 38 Packet RX power in dBm, -128 to 126, or 127 if invalid 0x07 - 0x73 Rx Data Up to 105 bytes of data from Base, up to 109 bytes from Router or Remote Table 7.3.17 www.RFM.com Technical support +1.678.684.2000 Page 38 of 83 © 2011 by RF Monolithics, Inc. E-mail: tech_sup@rfm.com...
- Page 39 RX power of packet as received by device’s parent in dBm, -128 to 126 or 0x0D Parent RX Power 127 if invalid Table 7.3.21 www.RFM.com Technical support +1.678.684.2000 Page 39 of 83 © 2011 by RF Monolithics, Inc. E-mail: tech_sup@rfm.com...
- Page 40 DAC0 setting, 0x0000 - 0x0FFF, in Little Endian byte order 0x12 - 0x13 DAC1 Setting DAC1 setting, 0x0000 - 0x0FFF, in Little Endian byte order Table 7.3.22 www.RFM.com Technical support +1.678.684.2000 Page 40 of 83 © 2011 by RF Monolithics, Inc. E-mail: tech_sup@rfm.com...
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Page 41: Configuration Parameter Registers
ParentNwkID - this parameter specifies the parent (BaseModeNetID) that a child radio is allowed to join. The valid range of this parameter is 0 to 63 (0x00 to 0x3F), plus 255 (0xFF). Setting the ParentNwkID to www.RFM.com Technical support +1.678.684.2000 Page 41 of 83 ©... -
Page 42: Technical Support
BaseModeNetID. The valid range of this parameter is 0x00 to 0x3F. A value greater than 0x3F is invalid and will be forced to 0x00 on a base. A router with an invalid Base- ModeNetID will be forced to operate as a remote. www.RFM.com Technical support +1.678.684.2000 Page 42 of 83 ©...
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