Rs232 over long distance

[Sneaky-geek]

Hi Everyone,
Not using a pic.
But here is my problem.
A piece of test equipment needs to be located 175 feet from computer. Data rate is 115k baud which is fixed.
Any ideas as to what is needed to make this work?

TNX
Terry K9HA
sneaky-geek

[rmteo]

Look into http://en.wikipedia.org/wiki/EIA-485

EIA-485 (also known as TIA/EIA-485 or RS-485) enables the configuration of inexpensive local networks and multidrop communications links. It offers data transmission speeds of 35 Mbit/s up to 10 m and 100 kbit/s at 1200 m. Since it uses a differential balanced line over twisted pair (like EIA-422), it can span relatively large distances (up to 4000 feet or just over 1200 meters).

[rmteo]

Get a pair of these http://www.serialcomm.com/serial_rs2...eral_info.aspx

[Sneaky-geek]

Rmteo,
Thank you for such a speedy response!
Looks like it might work. The remote device is a Digital-vector watt meter.
It will be located with at the output end of a Harris Platinum I amplifier salvaged from a TV station that switched from analog to digital, These two units are about 35 feet below a pair of 5 element Yagis.
Me, I'm about 175 feet away at the operating location inside a chicken coop.

Before the contest, I guess that all of this has to be assembled and tested to see if there will be any problems caused by all the RF that will be generated.

Just one last question, it looks like that a shielded 2 conductor cable is all that would be needed!

Again, Thank you so much,
Terry K9HA,
Sneaky-geek

[dhouston]

Careful - the RS485 adapter is only half-duplex. You probably need full duplex. The latter is possible but you need different line drivers and more wires in the cable.

[Sneaky-geek]

Thanks Dave,
Will this one work? It appears to offer full duplex and is isolated, which help with all the RF floating around the site.

www.serialcomm.com/serial_rs232_converters/rs232_to_rs485_converters/externally_powered_rs232_to_4_wire_rs485_rs422_con verter/ext_rs232_to_4_wire_rs485_rs422.product_general_in fo.aspx

Thank you again.
Terry K9HA
Sneaky-geek