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Hi all. I am new to the forum. I have a task in hand to make communication between a DVR and my 89S52 circuit. The DVR basically sends out RS485 signals for pan-tilt-zoom control of a video camera. Can you please help me out how to make the 89S52 read the RS485 signals from the DVR? I will be grateful to anybody who helps me out. I want information about the probable circuit diagram and Assembly codes for the same. Expecting your kind response friends,,,,,
Thanks with Regards G. Jayaprakash Chennai, India j37prakash@gmail.com
Thanks a lot Shyam. Since i am a fresher, I want you to elaborate your explanation. I have acquired a RS232-RS485 adapter. Please tell me how I should proceed, in simple steps. Thanks with Regards G. Jayaprakash Chennai, India j37prakash@gmail.com
Dear Shyam, the converter came in two parts. The first part (at the RS485 end) has a 2-way terminal for RS485 connection on one side directly connected to a 9 pin female D type connector at the other end. The second part has a 9 pin male D type connector linked to a 9 pin female D type connector through a circuitry with ICs HEF4093BT, 7660, MAX485, around 7 transistors and a few other components. I herewith attach the snapshots of the converter for your reference. Please help me ASAP. If you provide me with your contact number I can call you up and get my doubts cleared faster. Thanks with Regards G. Jayaprakash Chennai, India j37prakash@gmail.com
j37prakash, well that is almost the exactly the adapter i thought.. now it is easy.. all you need is a software runnng on your uC that would take/read data @ 9600 bps. read hope you have already downloaded the "D_Pelco" protocol details.
Thanks a lot Shyam for the timely help and guidance you gave, especially the link address you provided for Pelco-D protocol details. I am currently going through the stuff. In case I get another doubt, I will get back to you soon. I also have another humble doubt, but please do not mistake me. I am not going to connect the uC to a PC. I want to connect the uC only to a Digital Video Recorder that already gives out RS485 + and - terminals. So should I connect the RS232 end to the uC and the RS485 end to the DVR? Kindly mail me any sample code for the uC serial data reception. Thanks with Regards G. Jayaprakash Chennai, India j37prakash@gmail.com
if you are planning to use PC .. no use of uC. if you are using uC you neednt use pC! so decide first. lProgress is not made by early risers or hard workers, but by LAZY people, trying to find easier ways to do the same........
Dear Shyam, the usage of a PC is completely ruled out. There is no confusion about it. My doubt was that if you had meant to connect the 232 end to the uC and the 485 end to the DVR. What will be the rough idea of the coding for the uC? Thanks with Regards G. Jayaprakash Chennai, India j37prakash@gmail.com
coding depends on the RS485 packet format or protocol of DVR. make sure you have RS485 converter connected to RS232 pins of 8051 www.rickeyworld.info If you feel satisfied with the user's forum reply please click on the thank button.
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Anonymous | 05 Sep : 08:46
any suggestion abt the lcd in 4 bit mode written bottom can be mailed to suji.90@gmail.com
lcd in 4 bit mode | 05 Sep : 08:44
i have only 4 bits of p2 available,the upper nibble is already in use.so,how should i write #define lcd_data ------ i can't write like 1/2(p2) or #define lcd_port P2.because this may disturb the application running on p2.4,p2.5,p2.6,p2.7 please anyone give me a suggestion
Anonymous | 05 Sep : 06:47
hi..i want to know whether active and passive rfid have same protocols or what?
Hi everyone. I am doing project interfacing keypad with microcontroler
i am trying with 3x4 matrix keyboard &16*2 lcd. I googled two days gone through many codes but unable to make it. Even gone through tutorial on this ite also, http://www.8051projects.net/keypad-interfacing/8051-programming.php Still i din get proper complete program. I knew its not nice to ask complete code from others. Since i am getting confused to catch the concept, can somebody give me basic assembly code to If u upload the schematic of the code will help me better to mingle with proteus, If does not have i will make it. After all i just need basic code & full information of project.. If u really want myself to design, please guide me some procedures or tips. Because for the past two days i am trying hard but end up with somewhere else.
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