1/21/2015 2:37 PM | |
Joined: 6/14/2012 Last visit: 7/13/2023 Posts: 4 Rating: (0) |
Hello, i am struggeling to get the modbus working on CP340 (340-1AH02-0AE0), want to know how to connect the DB9 pins i have now: pin 2 = Data + pin 3 = Data - pin 5 = GND it is not working in this way, is this pinout correct? Thanks! -------------- New subject after splitting from MODBUS RTU MASTER FOR CP340/341/441-X (NO DONGLE REQUIRED). |
Last edited by: Min_Moderator at: 1/21/2015 4:33 PMSplitted |
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1/21/2015 5:30 PM | |
Joined: 1/17/2007 Last visit: 8/21/2024 Posts: 1545 Rating: (537)
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So let me get this straight. You want to connect RS232 directly to RS485/RS422? If that is the case then I have bad news for you. It can't be done. The 2 systems are totally different electrically. If you want to connect these 2 systems together, you will need a RS232 to RS485/RS422 convertor. Here is an example http://www.anybus.com/products/abcrs.shtml |
Programming today is the race between software engineers building bigger and better idiot proof programs, and the universe producing bigger and better idiots. |
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1/21/2015 7:43 PM | |
Joined: 6/14/2012 Last visit: 7/13/2023 Posts: 4 Rating: (0) |
I think i did not explain it correctly, I have an cp340 which is a rs232c device but can be used as an rs485 device with the blocks mentioned in the thread (correct me if i am wrong). I want to connect the cp340 with the modus blocks to a modus slave device. So the 340 will be master and the external device will be slave. Both on modus rs485, but how to connect the external device to the cp340? Hope anyone can help and understand what i mean.
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1/22/2015 10:05 AM | |
Joined: 6/14/2012 Last visit: 7/13/2023 Posts: 4 Rating: (0) |
Why is there an example program in: MODBUS RTU MASTER FOR CP340/341/441-X (NO DONGLE REQUIRED) MBMA340.zip Ithas the CP340 RS232Cmodule for modbus RS485 with the blocks provided. Is this a mistake then in the example? If so then i need to order the other card. |
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