support CanOpen, J1939 via RS485

We have a generic multi-port RS485 board. It supports Modbus RTU/ASCII. We need it to emulate Can CanOpen , J1939 (CAN) Master, via software. We have several CAN slave devices that need to be connected and communicated with, via the RS485 port. Modbus will not be used. Need you to develop code in MS Visual Studio and also for C (for embedded systems) for this purpose. This should not require any HW modifications to the RS485 board we have, nor should require any external HW adapter. Full software master driver is needed, supported all CAN commands. Refrain from using any libraries w/o source. We shall make the HW remotely accessible on your request. Daily update will be required. All the source of your application and any related developmental stuff will be owned by us. Do the Vis Std first and then C. Do CanOpen first and then J1939. The budget is flexible, so please respond with your best price and delivery. If you do not specify a time frame, we shall assume 2 weeks after order. 50% payment after beta version is satisfactorily tested with source delivered. The system will need to run and talk to several different vendor's Hardware and should run for 3 days w/o any hiccups. Please respond only if serious. Write CANOPEN as your 1st word of 1st sentence, so we know you are not a robot responding. Please refrain from providing any irrelevant data. If you need to present your other skills, we shall hold a separate session after the award. Please also explain how will you handle the electrical signal level differences of CAN vs. regular use of RS485 Please also state that the bid is that your response will be good for 2 weeks.