User manual

Table Of Contents
Connecting the COM Cable
Connecting a DB-9 or DB-25 connector to a PC serial port by rocking the connector back
and forth can cause a Com Port Crash in the TT8v2. If a crash occurs, remove the connector and
then cycle power to reset the TT8v2. The crash is caused by signals or apparent signals on the
receive pin of the communications port if they arrive when the TT8v2 is in low power sleep and if
the ground connection between the TT8v2 and the PC is intermittent.
To connect and disconnect the communications cable note the following guidelines:
1. Always boot the PC and start Crosscut before connecting the communications
cable to the controller.
2. Connect the communications cable first to the PC and then to the instrument.
3. Disconnect the communications cable first from the controller and then from the
PC.
4. Connect to and disconnect from the controller as smoothly as possible. Try to
prevent repeated intermittent contacts.
5. Leave the PC and Crosscut running until the COM cable is disconnected from the
controller.
Additional Documentation
A more detailed and complete description of Crosscut operations can be found in the file
crosscut.doc, which is included with the Crosscut program. Crosscut for Win has a help utility
which can be viewed by selecting ‘Help’ from the menu bar.
Appendix A-6