Originally Posted by
joecar
Summarizing from mr.prick's link (that's a very good link, thanks):
There are two types of serial equipment:
- DTE (data terminal equipment) e.g. computers, printers.
- DCE (data communications equipment) e.g. modems, wideband, FlashScanV2.
DCE devices can connect directly to DTE devices without Tx/Rx crossover.
Tx is the device's serial output (on which it sends out serial data).
Rx is the device's serial input (on which it receives in serial data).
Wideband and V2 are both DCE (transmit = Rx, receive = Tx)...
so somewhere in between them this has to be done (this is what the null modem adapter does, crosses Rx and Tx):
wb.Rx ---> V2.Tx
wb.Tx <--- V2.Rx
(see post #19 below)
See the attached diagram (I added some labels).