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#23025 - 04/16/12 07:09 PM Connecting the RS-485 bus to a PC
Cristian Adamo Offline
junior


Registered: 01/21/03
Posts: 32
Loc: Buenos Aires, Argentina
Hi there,

We are in the process of writing a simple test software to read directly into the RS-485 ADNet network (looking into HomeDeamon for some guidance in regards to the protocol).

My question is very basic: We have a RS-485<->RS-232 converter we bought here: http://www.commfront.com/rs232-rs485-rs422-serial-converters/RS232-to-RS485-Converters.htm

It has four terminals: A+, B-, GND, +5V

Can anyone point me as to how you would wire this to the Ocelot's RS-485 terminals?
I am assuming A/B on the ocelot refers to A/B on the adapter. I know that the +5V terminal is not needed, but not sure what to do with the GND terminal.

Thank you in advanced,

Cristian.-

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#23028 - 04/17/12 05:00 AM Re: Connecting the RS-485 bus to a PC [Re: Cristian Adamo]
Guy Lavoie Administrator Offline
Beyond All Hope
*****

Registered: 12/21/02
Posts: 6548
Loc: Montreal, QC, Canada
You would connect the +5V and GND terminals to an external 5 volt power supply (to power the converter). The web page indicates that external power is not normally needed, but they provided the terminals in case you connect the converter to another "port powered" device or for other situations. This is explained in their FAQ: http://www.commfront.com/rs232-rs485-rs422-serial-converters/Serial-Adapters-Faq.htm#13

Yes, the A/B terminals would go to the corresponding terminals on the Ocelot.
_________________________
"If you don't know what you're doing, do it neatly..."

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#23029 - 04/17/12 08:20 AM Re: Connecting the RS-485 bus to a PC [Re: Guy Lavoie]
Cristian Adamo Offline
junior


Registered: 01/21/03
Posts: 32
Loc: Buenos Aires, Argentina
Thank you Guy. Most RS-485 buses I've worked with connect the A, B, and also the Ground terminals, and hence I did not know what to do about Ground, and thought I might ask before blowing something up. I will then connect only the A and B terminals and leave the other two disconnected.

Cristian.-

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