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S7-200 and RS485/PPI problem with ATC-873-S2 RF transceivers

12/10/2012 5:35 PM	Rate (0)
eliyahu Posts: 2 Rating: (0)	I was read this topic: /tf/WW/en/Posts/2120 I have a problem like this but I have RF Transceivers with rs-485 protocol. My ATC-873-S2transceivers manual is here: http://www.a2s.pl/products/atc/linkres/ATC-873_Users_Manual.pdf I need to communicate s7-224xp whit STEP 7 Micro/win. Connunication looks good becouse TxD and RxD diodes shines when Micro/win searching devices (224xp). 224XP not searched unfortunetely :( Screenshot in attachment. please help Attachment 027.jpg (267 Downloads)
eliyahu Posts: 2 Rating: (0)
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12/11/2012 8:53 AM	Rate (0)
Marcjan Diamond Member Joined: 4/22/2010 Last visit: 3/31/2025 Posts: 5697 Rating: (716)	Hello, I think the problem is that the USB/PPI cable is terminated internal. See attached PDF. You can try to modify the cable andplace terminating resistors at CPU side, but no quaranty that will work. Regards, Marcjan Attachment s7200cableEnglish[1].pdf (279 Downloads)
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