Email: Password: Remember Me | Create Account (Free)


 

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
Andy Neil
02/05/10 09:53
Read: 142 times
Basingstoke
Uk


 		 #172918 - DCE = Modem
Responding to: Robert Henneke's previous message
Anything else is (or should be) a DTE.

So, if you're connecting 2 pieces of equipment together, and neither of them is a modem, they should both be DTEs - and a Null-Modem cable should be required.

RxD is an output from a DCE (modem); it is the data that the DCE (modem) has received, and is forwarding to the DTE - therefore, RxD is an input to a DTE.

Conversely, TxD is an input to a DCE (modem); it is the data that the DCE (modem) will transmit, after receiving from the DTE - therefore, TxD is an output from a DTE.

The easiest way to think of this is that "RxD" and "TxD" are the names of the circuits (Or connections) between the DTE and DCE - not as the names of the pins at the connectors:

Save This Code

   +------------+                       +------------+
   |            |         TxD           |            |
   |          in+<----------------------+out         |
   | DCE        |                       |        DTE |
   |         out+---------------------->+in          |
   |            |         RxD           |            |
   +------------+                       +------------+


List of 6 messages in thread
TopicAuthorDate
DCE and DTE      Robert Henneke      02/05/10 08:51      
   DCE = Modem      Andy Neil      02/05/10 09:53      
      Other RS232 Signals on connector      Joe Gold      02/05/10 11:04      
   Terminal program      Robert Henneke      02/05/10 11:35      
      If it's not a DCE (modem), then it must be DTE      Andy Neil      02/05/10 12:26      
   V.24: Definitions for interchange circuits between DTE & DCE      Andy Neil      02/05/10 13:07      

Back to Subject List