| ??? 02/21/07 20:27 Read: times |
#133463 - keep splitting :-) Responding to: ???'s previous message |
Caslav Nedeljkovic said:
Because I can name a few situations where your suggested pinout for cable (e.g. tiebacks) will fail since full hardware handshake IS required between two DTE devices and by 'faking' them on either side you'll interfere with their normal operation.
Correct, but I also have seen (in the past 20 years) a number of situations where one had to "fool" the application in order to make it work. Basically the RS232 was made to allow communication between modem (DCE) and terminal (DTE). If you connect two DTE's you have a number of alternatives to make it work. It all depends on the DTE's involved and their internal working. Some need DCD, some don,'t. Others need DCD and DSR, others don't. Some require DCD, DSR and CTS... others don't. Some don't require handshaking and flow control at all, others use X-On/X-off (inband flow control), and others can take anything... Just to say there is no general rule. It's a matter of reading the device specs, as it is with any microcontroller... regards Patrick |
