BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  PLEASE EXPLAIN ACK/ENQ PROTOCOL          BorlandTalk.com Forum Index -> C++ Builder (Language C++) View previous topic :: View next topic   Author Message Remy Lebeau (TeamB) Guest Posted: Mon Jun 06, 2005 8:07 pm    Post subject: Re: PLEASE EXPLAIN ACK/ENQ PROTOCOL "N. Karademir" <n.karademir (AT) smart-software (DOT) org> wrote Quote: can someone give me some info about ack/enq protocol? This is not a language issue. This group is for discussions related to Borland's implementation of the C++ language itself. Please direct your question to a more uitable group, such as the .nativeapi group which is for Win32 API discussions. Gambit Back to top Bob Gonder Guest Posted: Mon Jun 06, 2005 8:27 pm    Post subject: Re: PLEASE EXPLAIN ACK/ENQ PROTOCOL N. Karademir wrote: Quote: can someone give me some info about ack/enq protocol? This is the wrong group as RS232 has nothing to do with C or C++. Perhaps cppbuilder.internet, or more likely, the .nativeapi group would be better suited. Maybe even de.comm.protocols.misc or one of the comp.protocols.whatever Quote: i f i am right, the rs232 device sends me ENQ, then i send ACK back, then it sends data, finally i'll sent ACK.? I think that is backwards (been 20 years since I learned or use that) My recall is that the receiver (Mainframe) is asking the sender (Terminal) if it has any data (Enquire or ENQ), and the sender is responding ACK (yes) or NAK (no). This is used in a polling environment where the server has to keep tabs on many terminals, and can only talk to one of them at a time. Quote: How do i send ACK? is this just the letters "ACK" ? or is it a dec / hex value i have to send? Same as ENQ, it is a single char According to an old SDA II manual: ENQ 0x05 ACK 0x06 NAK 0x15 I seem to recall seeing a frame structure around them too, but don't recall any specifics. Your best bet would be to find out the official name for your protocol, and search for that. Back to top N. Karademir Guest Posted: Mon Jun 06, 2005 9:34 pm    Post subject: PLEASE EXPLAIN ACK/ENQ PROTOCOL Hello, can someone give me some info about ack/enq protocol? i f i am right, the rs232 device sends me ENQ, then i send ACK back, then it sends data, finally i'll sent ACK.? How do i send ACK? is this just the letters "ACK" ? or is it a dec / hex value i have to send? thanks N. 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