I could never get a RTS dongle to work , I even asked for help from the guy who wrote the Firmware, i was real supersized he even bothered to help me at all .. he wouldn't help me figure out why the RTS pin didn't work, I guess he figured it's outdated old stuff why brother, i should be glad he did what he did .......
that said
There is a pin one marked on the Hash board either under the white 6 pin data plug or above.... I would have to pull one of my boards and look were but it is by the white 6 pin plug you plug the data cable into not the PCIe power plug.
... the two middle pins are not needed on the the hash board.
I'll post a picture of one my plugs I made up that works....
to give you some idea ..
Pin 1 :RX to tx
pin 2 : TX to RX
pin 5: GND to GnD
pin 6 : DTR to DTR
pin 1 on the hash board is RX that goes to the TX pin on the dongle
PIn 2 on the hash board is TX and that goes to the RX pin on the dongle
Skip the two middle pins on the hash board and go to pin 5
pin 5 on the hash board is Gnd to Gnd pin on the dongle
PIN 6 is DTR pin on the hash board to dtr pin on the dongle ....
I did try a few different ways to try an make it work with a RTS an never got it to hash, it gave me all kinds of error's using a RTS dongle when i debugged, sense I'm not to skilled at creating code, i gave up after a week of tiring with a RTS dongle and went with what i know worked .
there is two different kinds of dongles one with a DTR pin only an no RTS pin, an one with RTS pin only with no DTR Pin ....
I think it's a driver issue with the BFGMINER rewrite i donated to have finished that was never finished ... and because it's old tech, no one cared when i got my hands on a Alchemist that still works for me or three boards do now.
which is fine because my next buy will either be a L3 + or A4 +, i mine to save now, i don't need to cash in my coins ....