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Has anyone tried making a Ethernet to serial converter that is POE compliant?
Would it be nice to have a Ethernet device server that can be installed in-line between the Ethernet Switch and the PLC serial port without need for power supplies.
If this converter is small enough, it could be used...
Re: RS 485 cable spec
There are specific cables that should be used for RS485 wiring.
The major requirement is that it has low capacitance.
One suggestion would be a **broken link removed**
This cable has six conductor, so it can be used for both RS485 full-duplex or half-duplex.
It's FREE
1. Goto https://rj485.com/index.php?main_page=pinout_db
2. Select a Manufacturer from the drop down box.
3. Select a Model from the drop down box.
4. Enjoy!
Re: Connection of RS485
1. Jumper the RxD+ and the TxD+ together and connect it to the RS485+
2. Jumper the RxD- and the TxD- together and connect it to the RS485-
Now the converter is also talking half-duplex like your device.
tom tran
The Online Pinout Project...
Does anyone has the User Manual for the Westinghouse PLC1500?
Can't seem to find it anywhere.
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Connect faster, use the pinout database!
https://rj485.com/index.php?main_page=pinout_db
That's easy.
The formula is mA = 4+((mmH2O+100)/200)*16
mmHg mA
-100 4
0 12
100 20
tom.tran@industran.com
Check out the Database Pinout at
https://rj485.com/index.php?main_page=pinout_db
I am still collecting pinouts for PLCs that are popular in Europe. Please contribute to this noble cause by emailing me pinout info that you have so I can add to the database.
Cheers
Tom.Tran@Industran.com
The maximum distance for the homerun cable depends on:
1) For output, how far below 24VDC can the end device affort?
2) For input, how far below 24VDC can the input card recognize as good signal?
Then you can calcuatel voltage drop to see if the cable is good enough...
rj485 pinout database
It's FREE
1. Goto https://rj485.com/index.php?main_page=pinout_db
2. Select a Manufacturer from the drop down box.
3. Select a Model from the drop down box.
4. Enjoy!
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