Kramer Electronics RB-6 - Manual (Page 20)

16 RB-6 - Connecting the RB-6
To connect a device with a RS-485 port to the RB-6:

For the first and last device on the RS-485 bus, set the RS-485 bus
termination switch (up to terminate)

Connect the A (+) pin on the RS-485 port of the PC to the A pin on the
RS-485 port on the rear panel of the RB-6

Connect the B ( –) pin on the RS-485 port of the PC to the B pin on the
RS-485 port on the rear panel of the RB-6

Connect the G pin on the RS-485 port of the PC to the G pin on the RS-485
port on the rear panel of the RB-6