Teledyne LeCroy Merlin II - Users Manual - Manual (Page 178)

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Merlin II Protocol Analyzer User’s Manual CATC SW Version 2.50
[ b ] HCITrace RS232 Cable - Has three DB-9 connectors:
• RS-232/Probe - Connects to the HCITrace Probe Cable or to the
TTL to RS232 converter (depending whether the signal voltage in
the IUT is TTL or RS-232).
• COM A - Connects to one of the serial inputs of the 2-port RS232 to
USB converter.
• COM B - Connects to one of the other serial input of the 2-port
RS232 to USB converter.
[ c ] TTL to RS232 converter - Use this converter for monitoring
TTL signalling. If the signalling is RS-232, omit this converter.
The DB-9 connector on this converter has two markings:
• TTL - Connects to the HCITrace Probe Cable.
• RS-232 - Connects to the 'RS-232'/Probe connector of the
HCITrace RS232 Cable.
[ d ] 2-port RS232 to USB converter - This converter is used so
the serial signals can be delivered to the host machine through a
USB input.
[ e ] USB cable - Connects the 2-port RS232 to USB
converter [d] to the USB port on the host PC.
1.2 Connecting the HCI Probe
The HCI probe can be set up to monitor different types of signalling:
• For monitoring UART level signals
• For monitoring RS232 level signals
Monitoring UART Level Signals
To monitor RS232 level signals, you use the TTL to RS-232 converter. If
you plan to connect the probe to a USB port on your PC, you will need to
also use the RS232 to USB Converter [d].
To assemble the HCI probe for this configuration, perform the following
steps. Refer to the photo and component list shown previously for
references to components [a] through [e].
Step 1 Connect the DB-9 connector of the HCITrace Probe Cable
[a] to the connector marked with ‘TTL’ in the TTL to
RS-232 converter [c].
Step 2 Connect the DB-9 connector marked with ‘RS-232’ in the
TTL to RS-232 converter [c] to the connector marked with
‘'RS-232/Probe’’ in the HCITrace RS-232 Cable [b].