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Bypassing SI_SCOPE's Internal Cable Check

Sometimes it is useful to configure SI_SCOPE not to perform its own internal cable check. This can be helpful in situations where you are working on a three wire system or if you are using SI_SCOPE to debug an embedded device using TTL signal levels. In these situations you may need to construct your own cabling that is tailored to your RS232/RS485 environment. To do this you will need to edit the "CABLE-SETTINGS" section of the file SI_SCOPE.INI that was installed to your Windows directory. Modify the CABLE_TYPE parameter to be either PASSIVE or ACTIVE. The setting you choose depends on how you have your system wired as explained below.

CABLE TYPE DESCRIPTION
PASSIVE When set to PASSIVE the program will operate under the assumption that the RX pin on port 1 is connected to the TX line of the link being debugged. The RX pin on port 2 is assumed to be connected to the RX line of the link being debugged. Therefore SI_SCOPE will display any received serial data on port one as data from the DTE device and data on port 2 as data from the DCE device.
ACTIVE If this value is set to ACTIVE the SI_SCOPE will operate in active mode. It will assume that the DTE source is connected to port 1 with NULL MODEM cable and the DCE source is connected to port 2. Therefore SI_SCOPE will display any received serial data on port one as data from the DTE device and data on port 2 as data from the DCE device.

Note: If you are not using your PC's  DCD, DSR, CTS, or RI pins they should be connected to ground.

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This page last updated on 03/29/2011