![emulador fiscal serial emulador fiscal serial](http://4.bp.blogspot.com/-VUrmBVv5KQ4/U2fCXGuIaPI/AAAAAAAAAu0/qNNMeGScZ1g/s1600/emuladores06.gif)
They follow a master – slave relationship between PC software and them.
#EMULADOR FISCAL SERIAL SERIAL#
They are connected to the PC with a serial connection and have a strict communication protocol, frame based, with start and end delimiters, sequence number and checksums, with established timings.
![emulador fiscal serial emulador fiscal serial](https://1.bp.blogspot.com/-vnF_5L3DcKg/YMDmfCE1AzI/AAAAAAAAAL8/CA1zAwQ1Z7QiLdBmEM8PC7b1eIZpLtPDACLcBGAsYHQ/s0/fk.jpg)
The printer part of them is hidden to the PC application. The problem is when they need to communicate with Fiscal Printers, and all Point of Sales need to.įiscal Printers are devices governed by their strict internal rules and logical states.
#EMULADOR FISCAL SERIAL DRIVERS#
Then I found vDos, so far I tested it, it worked great, on networks and both with the internal database drivers and with Btrieve. DosBox hangs up the moment it tries to run the program, no screen display, I suspect it has some conflicts with the protected mode it uses, because if I made a test program with Static mode it works but that is limited to small programs. These applications are mostly written in Clarion Database Developer 3 and compiled in Protected Mode. I am looking a way to extend for some time these applications but would like to avoid the hassle of installing virtual PCs on each, for the all known caveats and license issues. There is a massive need to renew most hardware and they are coming with 64 bits Windows. These companies still have 32-bit Windows or virtual PCs in some cases. I think I have a workaround for the lack of a device to test, I get back to this near the end of this post but please let me do an introduction before.Īs a software developer with 25+ year in activity I still have many DOS based transaction processing/management software (invoicing, stock, cash, credits, etc.) deployed on several small and medium companies, which for some reasons cannot be migrated on modern languages in the short term. I hope you keep interest (and energies) on this subject and be able to give it another try. I searched and read a lot of post regarding the subject on this discussion forums and realized there is a problem on this area and that you made several attempts to make it work but haven’t got real devices to test and test people have been keen to participate first but finally desisted. I am not being able to communicate through the serial COM ports with vDOS.