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What is the different between RS-485 and RS-422? » |
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What is the different between Data-control and RTS-control? » |
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Can I use MD-45 instead of MD-42 and MD-44? » |
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What is the different between RS-485 and RS-422? |
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RS-422 uses 2 wires for simplex transmission. RS-485 can use 2 wires for half duplex transmission. Full duplex systems are implemented using 4 wires. Both RS422 and RS485 can be used in multidrop configurations however precautions must be taken to prevent more than one transmitter being active on the same bus at once. |
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What is the different between Data-control and RTS-control? |
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Data-control: The data flow starts on the first bit.
RTS-control: The data flow is controlled by handshaking. RTS (request to send) and CTS (Clear to send). |
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Can I use MD-45 instead of MD-42 and MD-44? |
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The compatibility of MD-(MA)-42, MD(MA)-44 and MD(MA)-45
The older units called MD(MA)-42, and MD(MA)-44 are replaced by MD-45.
If they are compatible depends on the way to control the data flow.
MD-42, MA-42 and MA-49 controlled by RTS (Request To Send) signal or in RS-422 transmission
the transmitter can be set always active.
MD-44, MA-44 and MA-47 are controlled only by data flow.
In MD-45, MA-45 can the data direction be controlled by data flow or RTS.
The new units (MD-45) that are produced after jan. 2003 has the transmitter always active function.
Note! The function, transmitter always active, is only for the RS-422 (4-wire).
| The new function in MD-45 works from serial number: |
| MD-45 AC |
2668 |
| MD-45 115VAC |
139 |
| MD-45 LV |
3012 |
| MD-45 LV temp |
32 |
| MA-45 AC |
2414 |
| MA-45 DC |
74 |
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