Just for people browsing, some USB/Serial adapters now come with null modem functionality built-in. So these units will not require a separate null modem cable if plugged directly into kit. However, some cables, particularly speaker-link dongles, are wired in null modem form which, for cables requiring a separate null modem cable, is the correct configuration. However when these cables are used with null modem configured USB/Serial converters, such as the StarTach unit, an additional null modem adapter will also be required to negate the cross wired configuration in the USB/Serial adapter. You will need to check exact pin outs on each device to confirm the exact gender of adapter/cable required.
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