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communications between MD720&CP340

4/27/2013 3:10 AM	Rate (0)
H.SAPER Bronze Member Joined: 11/12/2008 Last visit: 3/12/2025 Posts: 221 Rating: (16)	Hi every body, after I downloaded the project to plc, there is no communication between CP340 and MD720. this is first time I tried the SMS project. Note that I downloaded the library from this link: http://support.automation.siemens.com/WW/view/en/25545680 also I discussed this issue before, but it was with FB17 can not be dowloaded to the PLC, but now I solved the problem by meanse the library in above link. see attached also I'm using serial cable D9 with two female terminals. as the following: D9 female D9 female 1 DCD 1 2 RXD 2 3 TXD 3 4 DTR 4 5 GND 5 6 DSR 6 7 RTS 7 8 CTS 8 9 RI 9 Regards to all Attachment md720_cp340.jpg (53 Downloads)
	Last edited by: H.SAPER at: 4/28/2013 2:36 PM HASSAN.S POJAILA
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4/27/2013 8:26 AM	Rate (0)
Saravana kumar Gold Member Joined: 2/6/2009 Last visit: 1/7/2025 Posts: 939 Rating: (118)	H.SAPER Hi every body, after I downloaded the project to plc, there is no communication between CP340 and MD720. this is first time I tried the SMS project. Note that I downloaded the library from this link: http://support.automation.siemens.com/WW/view/en/25545680 also I discussed this issue before, but it was with FB17 can not be dowloaded to the PLC, but now I solved the problem by meanse the library in above link. see attached also I'm using serial cable D9 with two female terminals. as the following: D9 female D9 female 1 <=> 1 2 <=> 2 3 <=> 3 4 <=> 4 5 <=> 5 6 <=> 6 7 <=> 7 8 <=> 8 9 <=> 9 Regards to all Hi, I am also doing the similar project. As per the manual the MD 720-3 baud rate to be changed as 9600 from default speed (via Hyper terminal). Could you please tell me how you did this and what pin configuration you used for communication between PC and MD 720-3?
	_______________________________________________________________ Best Regards T.Saravana Kumar "All for the Best"
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4/27/2013 2:56 PM	Rate (0)
H.SAPER Bronze Member Joined: 11/12/2008 Last visit: 3/12/2025 Posts: 221 Rating: (16)	Hi, As I shown above, I used pin to pin confiuration, it's connected succssfuly between PC and MD720 and I can configer the MD720, but I do not know if the same cable can I use for communication between CP 340 and MD72-3. attached picture shows setting of baud rate by Hyper Terminal. Thanks Attachment terminal.JPG (91 Downloads)
	Last edited by: H.SAPER at: 4/27/2013 3:58 PM Last edited by: H.SAPER at: 4/27/2013 3:57 PM I attached the picture Last edited by: H.SAPER at: 4/27/2013 3:02 PM HASSAN.S POJAILA
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This contribution was helpful to 1 thankful Users Saravana kumar

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