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Can I connect directly to an S7-200 with an generic RS-485 cable?
Created by: Tim99 at: 9/17/2008 10:05 PM (6 Replies)
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| 9/18/2008 7:39 AM | |
Joined: 9/28/2005 Last visit: 12/9/2025 Posts: 2957 Rating:
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Hi, Generic RS-485 cable is the same as MPI. Pins 3 and 8 is used for data + and data - and pin 5 is used for grounding. All RS-485 standard cables are the same. RS-485 is hardware standard and MPI, Profibus etc are only protocols running on RS-485 media. |
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Best regards, |
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| 9/18/2008 10:31 AM | |
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Posts: 116 Rating:
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if you are having PC with RS-485 port then you can directly communcate with S7-200 provided it supports PPI protocol and baud rate is 19.2 K. |
| 9/19/2008 2:42 AM | |
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Posts: 191 Rating:
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Hi!! be careful, because PLC port supplies voltage... just take care that your cable only connects to pin 3, 8 and 1 ROSA |
| 9/19/2008 7:03 AM | |
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Posts: 116 Rating:
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Hi Rosa, I am confused about pin numbers. These are 3, 5, 1 or 3, 5, 8? Please correct me if I am wrong... |
| 9/19/2008 7:30 AM | |
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Joined: 9/28/2005 Last visit: 12/9/2025 Posts: 2957 Rating:
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Hi, Pins 3 and 8 = data Pin 5 = GND |
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Best regards, |
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| 9/19/2008 5:18 PM | |
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Posts: 191 Rating:
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Hi!! Darius is right.. pin 1 is shield GND |
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