Rfd900

[bide]

SiK firmware version 1.x is point-to-point (only 2 radios)
SiK firmware version 2.x is multipoint (2 or more radios)
*one advantage to version 2.x is automatic TX power level

I have never used app tools, so I can’t help with that.

You say you have putty, and I assume you can ssh in to Reach. You can send AT commands to the radio with the program screen

@bide

used the program screen in Reach to connect the console to the serial port like so: screen /dev/ttyMFD2 57600 and with that, I was able to:
type characters on one Reach, and watch them appear on the other Reach, and
send modem (AT) commands to the local and the remote RFD900 modem

I could explain step by step for you, but you must tell me what you want to change and also explain how your radios are connected.