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Serial Communication Protocol
Bid Request Id: 11248
Bookmark in my 'To Do' list
Posted by: VB_HELP (3 ratings)
(Software buyer rating 10)
Non-action Ratio: Very Good - 0.00%
Buyer Security Verifications: Good
Approved on: Mar 19, 2002
3:52:04 PM EDT
Bidding Closes: Apr 2, 2002
4:02:39 PM EDT
Viewed (by coders): 325 times
Deadline: 3/22/2002
100% of work completed and accepted. Coder has been paid.
Max Accepted Bid: Bidding is closed
Project Type: Personal Project / Homework Help
Bidding Type: Open Auction
Categories: Visual Basic
Enter chat room for this bid request
(0 active users at Sep 19, 2003 7:25:05 AM EDT)

The following is the protocol I need to have designed in a Visual Basic Class/Classes and two forms (one form will be the Server, the other will be the Client): Communication Protocol: Messaging between the servers is bi-directional (either side may initiate). An ENQ/ACK-NAK protocol is employed wherein the sender first transmits an enque (ENQ) to bid for the line and must receive an ACK response to the ENQ before actually transmitting the data message. Line bid collisions (simultaneous ENQ's by both sides) are resolved in favor of the Server. Server will ignore an ENQ received from Client when Server has a line bid (sent ENQ) outstanding. Client will always ACK Server's ENQ and will relinquish its line bid if it is waiting for an ACK to its ENQ. All messages are of the format <STX> message data <ETX> <bcc> where <bcc> (block check character) is the one-character 'exclusive or' of all characters in the message following (but not including) STX through and including ETX. ACK/NAK response to received messages (not to ENQ) is returned according to block check validity without regard to message format or content. There is no provision in the protocol or message set definition for reporting or responding to received data that is found to be erroneous or invalid. A NAK response to a received message is returned ONLY on failure of the bcc calculation. There is defined within Client a logical status reflecting a basic property of the interface known as 'link up'/'link down'. This property is considered to indicate internally to the Server that the Client is/is not communicating with the link established. On interface startup, link down status is assumed. The Server protocol manager will not attempt to send any queued message to the Client except 'Start Transmission' (record-id "08", message "STARTRAN"). The 'link up' status occurs when and only when the protocol manager has received an ACK response to a 'Start Transmission' message. The 'link down' condition occurs when: the interface is first 'started'; three successive NAK's are received from the Client; three 'response timeout's' occur to a message sent to the Client (maximum response time for receipt of ACK is 3 seconds when 'link up', 30 seconds when 'link down'); or when an ACK is received in response to a 'Stop Transmission' (record-id "07", message "STOPTRAN")

Complete and fully-functional working program(s) in executable form as well as complete source code of all work done.

Complete copyrights to all work purchased.

Windows 98, Windows NT 4.0 SP3

Must be 100% finished and received by buyer on:
Mar 22, 2002 EDT
Deadline legal notes: All times are expressed in the time zone of the site EDT (UT - 5). If the buyer omitted a time, then the deadline is 11:59:59 PM EDT on the indicated date.

Special Conditions / Other:
I need to present this project before or on march 22, so every help will be appreciate and compensate.

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Name   Bid Amount 
Date   Coder Rating  
(11 ratings)
in Houston, Texas
United States
Bid id: 127,067
N/A Mar 19, 2002
4:22:18 PM EDT
This protocol you describe sounds very similar to the DirectNet protocol. I'm a professional industrial software engineer, and have been programming for over 10 years.

I can do this for you, but not by the required date you have requested. *IF* you can change that to the 24th or 25th, I would be happy to do it for you.
  There are 15 private replies to/from Royce3. Click here to view them.

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