We have been using the attached circuits for many years for an RS232 current loop isolated transmission link at 9600 baud. We have tested it successfully over 1200 mtrs. We now need to increase the baud rate to 19200 baud and are experiencing problems transmitting over a distance of about 600 mtrs. Our installation has to use existing cabling which, no doubt, has a higher capacitance/mtr than if we were able to install new cable at as low a capacitance/mtr as possible. Our original designers are no longer with us so I would like to ask if anyone can identify the component(s) in our circuits that needs to be changed to acheive our requirement.
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