User's Manual
Table Of Contents
- Description
- Features
- Ordering Information
- Absolute Maximum Ratings
- Electrical Specifications
- Typical Performance Graphs
- Pin Assignments
- Pin Descriptions
- Module Pin Assignments
- Module Dimensions
- Theory of Operation
- Module Description
- Overview
- Addressing Modes
- Automatic Addressing
- Address Register Use
- Acknowledgements and Assured Delivery
- Frequency Hopping Spread Spectrum
- Compatibility with the 250 Series
- Networking
- Transmitting Packets
- Receiving Packets
- Using the Buffer Empty (BE) Line
- Exception Engine
- Carrier Sense Multiple Access (CSMA)
- Using the Command Response (CRESP) Line
- Using the CMD Line
- AES Encryption
- Using the MODE_IND Line
- Using the PB Line
- Restore Factory Defaults
- Using the Low Power Features
- Baud Rate and Transmitter Output Power
- The Command Data Interface
- Reading from Registers
- Writing to Registers
- Command Length Optimization
- Example Code for Encoding Read/Write Commands
- The Command Data Interface Command Set
- Typical Applications
- Usage Guidelines for FCC Compliance
- Additional Testing Requirements
- Information to the user
- Product Labeling
- FCC RF Exposure Statement
- Antenna Selection
- Power Supply Requirements
- Antenna Considerations
- Interference Considerations
- Pad Layout
- Castellation Version Reference Design
- Microstrip Details
- Board Layout Guidelines
- Helpful Application Notes from Linx
- Production Guidelines
- Hand Assembly
- Automated Assembly
- General Antenna Rules
- Common Antenna Styles
- Regulatory Considerations
- Notes
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54 55
TXPWR - Transmitter Output Power
Volatile Address = 0x4D; Non-Volatile Address = 0x02
The value in the TXPWR register sets the module’s output power. Figure 43
shows the command and response and Figure 44 available power settings
and typical power outputs for the module. The default setting is 0x0A.
HumPRO-A
TM
Series Transmitter Output Power Mode Register Settings
PWR Typical Output Power (dBm)
0x00 -7.7
0x01 -7.7
0x02 4.6
0x03 8.3
0x04 14.1
0x05 20.0
0x06 21.7
0x07 23.6
0x08 25.0
0x09 25.0
0x0A 25.0
Figure 43: HumPRO-A
TM
Series Transmitter Output Power Mode Command and Response
Figure 44: HumPRO-A
TM
Series Transmitter Output Power Mode Settings
HumPRO-A
TM
Series Transmitter Output Power Mode
Read Command Read Response
Header Size Escape Address ACK Address Value
0xFF 0x02 0xFE
0x4D
0x02
0x06
0x4D
0x02
PWR
Write Command
Header Size Address Value
0xFF 0x02
0x4D
0x02
PWR
UARTBAUD - UART Baud Rate
Volatile Address = 0x4E; Non-Volatile Address = 0x03
The value in UARTBAUD sets the data rate of the UART interface.
Changing the non-volatile register changes the data rate on the following
power-up or reset. Changing the volatile register changes the data rate
immediately following the command acknowledgement. Figure 45 shows
the command and response and Figure 46 shows the valid settings.
If the module’s UART baud rate is different than the host processor UART
baud rate then the module will not communicate correctly. If mismatched,
every rate can be tested until the correct one is found or the module can be
reset to factory defaults. The default baud rate is 9,600bps (0x01).
Figure 45: HumPRO-A
TM
Series UART Baud Rate Command and Response
Figure 46: HumPRO-A
TM
Series UART Baud Rate Settings
HumPRO-A
TM
Series UART Baud Rate Register Settings
V Baud Rate (bps) RF Data Rate (bps)
0x01 9,600 19,200
0x02 19,200 19,200
0x03 38,400 153,600
0x04 57,600 153,600
0x05 115,200 153,600
0x06 10,400* 153,600
0x07 31,250* 153,600
* These data rates are not supported by PC serial ports. Selection of these rates may
cause the module to fail to respond to a PC, requiring a reset to factory defaults.
HumPRO-A
TM
Series UART Baud Rate
Read Command Read Response
Header Size Escape Address ACK Address Value
0xFF 0x02 0xFE
0x4E
0x03
0x06
0x4E
0x03
V
Write Command
Header Size Address Value
0xFF 0x02
0x4E
0x03
V
Note: The maximum transmitter output power allowed by regulations is
24dBm (TXPWR = 0x07) if the UART rate is set to 38,400bps or higher
(UARTBAUD = 0x03 or higher). All power levels are allowed if the UART
rate is 19,200bps or less (UARTBAUD = 0x01 or 0x02). The module
automatically restricts the max power based on the UARTBAUD value.