How Software Gets Done  


Login

Software Buyers
Request bids
Search coders
My Buyer Account
Buyer help
Buyer articles
Buyer FAQ
Latest news
 
Software Coders
Newest open work
Browse all work
Search all work
My Coder Account
Coder help
Coder articles
Coder FAQ
Latest news
 
Affiliates
My Affiliate Account
Affiliate help
Affiliate FAQ
Latest news
 
Newest Bid Requests.
(See all)
ASP and Excel import to SQL
By wow1234 on Sep 18
Max Bid: $10


Serious Main Page Redesign
By passionatesac on Sep 18
Max Bid: Open to fair suggestions


jpeg validator resize program
By coderod on Sep 19
Max Bid: Open to fair suggestions


Win2k drivers for Sony VAIO PCG-505TX
By hketola on Sep 18
Max Bid: $20


WORKING ASSETS
By Galexa1611 on Sep 18
Max Bid: $500


NTFS/FAT16/FAT3 2 file and directory manipulation
By NDawg on Sep 18
Max Bid: $75


Click here to put this ticker on your own site and/or get live RSS newsfeeds

Open Work Categories.
Database 
(206 open)
   Access 
(72 open)
   MySQL 
(118 open)
   Oracle 
(11 open)
   SQL Server 
(82 open)
   Other DB 
(23 open)
Documentation / Tech Writing 
(26 open)
   Language (Human) Translations 
(11 open)
Data Entry 
(43 open)
Game Development 
(20 open)
Graphics / Art / Music 
(57 open)
   Graphics 
(61 open)
     Adobe AfterEffects 
(10 open)
     Adobe Photoshop 
(33 open)
     Adobe Premiere 
(8 open)
     3d Animation 
(16 open)
   Art (Misc.) 
(16 open)
   Music 
(9 open)
   Photography 
(5 open)
   3d Modeling 
(13 open)
Language Specific 
(141 open)
   Assembly / Machine language 
(12 open)
   ASP 
(69 open)
   ASP .NET 
(70 open)
   C# 
(71 open)
   C++ / C 
(154 open)
   Carbon (Mac OS) 
(4 open)
   Cocoa / Obj-C 
(5 open)
   Cold Fusion 
(16 open)
   Delphi 
(57 open)
   Java 
(89 open)
   JSP 
(15 open)
   Perl 
(53 open)
   Python 
(6 open)
   PHP 
(119 open)
   XML/XSL 
(40 open)
   Visual Basic 
(166 open)
   Visual Basic .Net 
(110 open)
   Other 
(78 open)
Misc 
(32 open)
   Middleware 
(2 open)
   CAD 
(5 open)
MultiMedia 
(30 open)
   Video Editing 
(6 open)
Network 
(34 open)
   Network Design 
(4 open)
   Network Implementation 
(7 open)
Platforms 
(71 open)
   Windows 
(194 open)
     MS Exchange 
(14 open)
     MS Office 
(23 open)
     Other 
(12 open)
   Darwin 
(3 open)
   Embedded Systems 
(9 open)
   Hand Held/PDA Programming 
(13 open)
   Internet Browser 
(50 open)
   Linux 
(73 open)
   Lotus Notes / Domino 
(2 open)
   UNIX 
(36 open)
Requirements 
(8 open)
Security 
(31 open)
Testing / Quality Assurance 
(14 open)
Web 
(185 open)
   Page Design 
(91 open)
   Flash 
(62 open)
   Marketing 
(18 open)
     Search Engine Optimization 
(11 open)
     Marketing (Other) 
(15 open)
   Web Services 
(97 open)
   Web (Other) 
(107 open)
Training 
(9 open)
   Computer Based 
(12 open)
Other
 
Other Sites

Download the free Rent A Coder IE toolbar!
 
Show Bid Request

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
TIME EXPIRED
Phase:
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)

Description:
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")

Deliverables:
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.


Platform:
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.


Remember that contacting the other party outside of the site (by email, phone, etc.) on all business projects < $500 (before the buyer's money is escrowed) is a violation of both the software buyer and seller agreements. We monitor all site activity for such violations and can instantly expel transgressers on the spot, so we thank you in advance for your cooperation. If you notice a violation please help out the site and report it. Thanks for your help.
 
Bidding/Comments:
All monetary amounts on the site are in United States dollars.
Rent a Coder is a closed auction, so coders can only see their own bids and comments. Buyers can view every posting made on their bid requests.

See all rejected bids (and all comments)
Name   Bid Amount 
 
Date   Coder Rating  
Royce3
(11 ratings)
in Houston, Texas
United States
Bid id: 127,067
 
N/A Mar 19, 2002
4:22:18 PM EDT
 10
(Excellent)
   
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.
 




Bid Request Search
 Advanced Search
Newest Open Work
Latest News  
Credentials


 

 
Rent A Coder upholds the rigorous business practices required to be both a BBB member and Square Trade vendor.
  • All customer issues addressed within 2 days
  • Openly disclosed pricing and return policies
  • Participation in mediation at buyer request
  • Superior selling track record
This site is verified through its parent company, Exhedra Solutions, Inc.
 
Top Coders.

Securenext
Rated a 9.97 on 122 jobs 
Buddies
Rated a 9.85 on 94 jobs 
Codman
Rated a 9.97 on 158 jobs 
hernest
Rated a 10 on 122 jobs 
Andrei Remenchuk
Rated a 10 on 14 jobs 
D-N-S
Rated a 9.93 on 39 jobs 
markesh
Rated a 10 on 23 jobs 
Maxnet Technologi es Private Limited
Rated a 9.93 on 86 jobs 
GribFritz
Rated a 9.89 on 144 jobs 
PSergei
Rated a 9.77 on 105 jobs 

See all top coders...

(What makes a top coder?)

Top Exam Scorers

 
Other
Rent A Coder is PayPal verified through its parent company, Exhedra Solutions, Inc.

Created in partnership with:

 

Affiliate Sites
Latest News | About Us | Kudos | Feedback/Contact    Affiliates | Advertise    Privacy | Legal

Copyright 2001, Exhedra Solutions, Inc. All rights reserved.
By using this site you agree to its Terms and Conditions.
"Rent A Coder" (tm), "Safe Project Escrow" (tm) and "How Software Gets Done" (tm)
are trademarks of Exhedra Solutions, Inc.