Captain Caveman
Active Member
Can anyone point to a tutorial on making custom rs232 cables and how to daisy chain them together? Elk makes it simple with a hub but what about regular cables when not using Elk products?
Correct, you can't daisy chain RS-232 but as you suggested, can use an RS-232 distribution box such as the Edgeport (USB to eight serial port adapter).Captain Caveman said:Can anyone point to a tutorial on making custom rs232 cables and how to daisy chain them together? Elk makes it simple with a hub but what about regular cables when not using Elk products?
Don't you mean RS485 instead? You dont daisychain RS232
I would just use a cat5 run for each thermostat and parallel the connections at the Cortexa unit, rather than a true daisy chain wiring.
The HAI thermostats work at a blazing 300 baud, so anything under 1,000 - 2,000 feet should work fine. But I haven't personally tested thatCaptain Caveman said:Do you know the combined maximum distance?
Intended for connection to personal computers or other systems with RS-232 ports. 4 wires to the thermostat: DTR, RXD, TXD and Ground. All wires are optically isolated in the thermostat. The thermostat transmits with a modified RS-232 transmitter that can be tri-state (high impedance) so that more than one thermostat can be connected in parallel to a single RS-232 port.