I assume you have an RX50 dual-floppy on your machine, and that you're trying to get the data off of e.g. an ST506 MFM HDD that's in the machine.
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Get a PC or laptop setup with serial to the box. You want to connect to the Console port (the top left one), set the rotary switch to 9600 bps (setting 14) as 19200 is too unstable. You'll also need a null modem crossover to swap RX/TX and RTS/CTS. I recommend using Kermit on your machine to speak to the PDP, as you'll need it for file copies anyway. You can create the following script as e.g. pdp.ck and execute $ kermit pdp.ck to automatially connect to the machine with the correct parameters:
set line /dev/ttyR0 ; replace with the correct device for you ; this is port 0 on a RocketCom 8-port serial card set speed 9600 ; rotary switch setting 14 on the micro PDP-11 set parity even ; set stop-bits 1 ;
set session-log binar