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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– –
50 51
CRCERRS - CRC Error Count
Volatile Address = 0x40
The value in the CRCERRS register is incremented each time a packet with
a valid header is received that fails the CRC check on the payload. This
check applies only to unencrypted packets. Overflows are ignored. Writing
0x00 to this register initializes the count. Figure 38 shows the command
and response.
HOPTABLE - Channel Hop Table
Volatile Address = 0x4B; Non-Volatile Address = 0x00
The module supports 6 different hop sequences with minimal correlation.
The sequence is set by the value in the HOPTABLE register. Changing the
hop sequence changes the band utilization, much the same way that a
channel does for a non-hopping transmitter. The hop table selection must
match between the transmitter and receiver. Valid values are 0-5. Figure 39
shows the command and response.
Figure 40 shows the RF channels used by the HumPRO
TM
Series. When
the baud rate is set to 9,600 or 19,200 bps, the module uses 50 hopping
Figure 38: HumPRO-A
TM
Series CRC Error Count Command and Response
Figure 39: HumPRO-A
TM
Series Channel Hop Table Command and Response
HumPRO-A
TM
Series CRC Error Count
Read Command Read Response
Header Size Escape Address ACK Address Value
0xFF 0x02 0xFE 0x40 0x06 0x40 V
Write Command
Header Size Address Value
0xFF 0x02 0x40 V
HumPRO-A
TM
Series Channel Hop Table
Read Command Read Response
Header Size Escape Address ACK Address Value
0xFF 0x02 0xFE
0x4B
0x00
0x06
0x4B
0x00
V
Write Command
Header Size Address Value
0xFF 0x02
0x4B
0x00
V
HumPRO-A
TM
Series RF Channels
Channel Number Frequency (MHz) Channel Number Frequency (MHz)
0 902.971 32 915.000
1 903.347 33 915.376
2 903.723 34 915.752
3 904.099 35 916.128
4 904.475 36 916.504
5 904.851 37 916.880
6 905.227 38 917.255
7 905.602 39 917.631
8 905.978 40 918.007
9 906.354 41 918.383
10 906.730 42 918.759
11 907.106 43 919.135
12 907.482 44 919.511
13 907.858 45 919.887
14 908.234 46 920.263
15 908.610 47 920.639
16 908.986 48 921.014
17 909.361 49 921.390
18 909.737 50 921.766
19 910.113 51 922.142
20 910.489 52 922.518
21 910.865 53 922.894
22 911.241 54 923.270
23 911.617 55 923.646
24 911.993 56 924.022
25 912.369 57 924.398
26 912.745 58 924.773
27 913.120 59 925.149
28 913.496 60 925.525
29 913.872 61 925.901
30 914.248 62 926.277
31 914.624 63 926.653
Figure 40: HumPRO-A
TM
Series RF Channels
channels. Figure 41 shows the hop sequences referenced by channel
number. When the baud rate is 38,400bps and higher, the module uses 26
hopping channels and only even channels are used. Figure 42 shows the
hop sequences referenced by channel number. The default hop sequence
is 0.