Not exactly a design question, but I thought some of you may be able to help. I've just bought a USB-to-RS232 converter cable for my laptop and it came with a weird 9-pin FEMALE to 9-pin MALE adapter. I initially thought it was a null-modem adapter, but upon examination it uses the following wiring which I've never seen before:
FEMALE MALE
PIN 1 o----+ +---------o PIN 1 | | PIN 2 o--- | ---+ | PIN 2 | | | PIN 3 o--- | -- | ---+ | PIN 3 | | | | PIN 4 o--- | -- | -- | ---+ PIN 4 | | | | PIN 5 o--- | -- | -- | -- | ---+ PIN 5 | | | | | PIN 6 o----+ | +--------------o PIN 6 | | | PIN 7 | | +----o PIN 7 | | PIN 8 o-------- | --------+ PIN 8 | PIN 9 +-------------------o PIN 9
CASE o-----------------------------o CASE
Note that pins 2 and 3 (TxD, RxD) are not used at all in the MALE side! The adapter has the label "NBT/BT" on it. There is no mention about it in the box or manual. I Googled about it but nothing relevant came up... Any ideas on what this wiring is for?
Many thanks.
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