User's Manual
Table Of Contents
- 7. Display Options
- 8. Reading a CATC Trace
- 8.1 Trace View Features
- 8.2 Interpreting the Displayed Information
- 8.3 Tooltips
- 8.4 Set Marker
- 8.5 Edit or Clear Marker
- 8.6 Adding Comments to a Trace File
- 8.7 Expanded and Collapsed Data Formats
- 8.8 Hide Frequency Hops
- 8.9 Hide Nulls and Polls
- 8.10 Menus in Clicked Fields
- 8.11 Hide Unassociated Traffic
- 8.12 Hide Channel
- 8.13 Hide Duplicated Traffic
- 9. Searching Traces
- 10. Decoding Protocols
- 10.1 Introduction
- 10.2 LMP and L2CAP Messages
- 10.3 Decoding and Viewing Higher Protocol Data
- 10.4 Tooltips
- 10.5 Viewing Packets in LMP and L2CAP Messages
- 10.6 Types of LMP and L2CAP Messages
- 10.7 Viewing L2CAP Channel Connections
- 10.8 Viewing Protocol Messages and Transactions
- 10.9 Decoding via the Profiles Toolbar
- 10.10 Changing Protocol Assignments
- 10.11 Encryption
- 10.12 Re-applying Encryption Settings
- 11. Reports & Exporting Data
- Appendix A: Merlin II Clock Calibration
- How to Contact CATC
- Limited Hardware Warranty
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Merlin II Protocol Analyzer User’s ManualCATC SW Version 2.30
Acknowledgments are easily seen in Merlin II traces because Merlin II adds
an Ack’d field on data packets of the transmitting device. This means that
you do not have to hunt through the trace to see if the packet was
acknowledged.
The following screenshot shows two examples of Acknowledgments.
Implicit NACK - Packet 14577 is a data packet sent by the piconet Master
device. Packet 14579 should have been a data packet with an
acknowledgment. Instead, it is an empty packet. This Master interprets this
empty packet as an Implicit NACK (i.e., implicitly not acknowledged).
Merlin II summarizes this packet exchange by adding an Ack’d field to the
Master’s data packet and setting the Ack’d field to Imp Nak.
ACK - Packet 14580 is the Master’s retransmission of the data sent in
packet 14577. Packet 14582 is the reply by the Slave device. This reply
contains an ARQN field with a value of (= Acknowledge). Merlin II
summarizes this packet exchange by setting the Ack’d field on packet
14580 to Ack.