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Serial interface hardware design

Other Parts Discussed in Thread: TMS320F28335, ISO15, SN6501, SN6505B, SN6505A

Hi. I am designing a board with the TMS320F28335 MCU and have a question about the serial communications interface (SCI).

I have looked at the GPIOs of the TMS320F28335 datasheet and it seems that there are multiple GPIO pins on the F28335 that can be configured as Tx/Rx pins for SCI (Serial Communications interface). For example, GPIO29 and GPIO 35 can both be configured for ‘SCI-A transmit’. Could someone please tell me which pins I should use to connect the RS485 transceiver to, if there is any preference? It should be noted that serial communication will be used to program the onboard flash memory of the microcontroller and to communicate with PLCs in the field.

I also would like to know what isolated power supply I should use for the transceiver ISO15 (http://www.ti.com/product/iso15/description), for the bus side of the chip. IT needs a 3.3V isolated supply.