Maxim Integrated 78M6610+LMU Evaluation Kit - Manual (Page 12)

78M6610+LMU Evaluation Kit User Manual
12 Rev 1
J27 Jumper Description
J27 Pins Description Default
1/2 Enable on-board RS485 termination resistor -
J28 Jumper Description
J28 Pins Description Default
1/2 Connect USB Controller to isolation IC (U7) Installed
J29 Jumper Description
J29 Pins Description Default
1/2 Connect USB Controller to isolation IC (U7) Installed
J38 Jumper Description
J38 Pins Description Default
1/2 Enable on-board RS485 termination resistor -
4.2 Isolated RS-485 Interface
The board also includes an isolated RS-485 interface as an alternative to the USB interface. The
78M6610+LMU serial UART is connected to the RS-485 transceiver. Refer to the IC data sheet for details on
the serial protocol.
 Move J12, J17, and J18 jumpers from position 1-2 to position 2-3 to connect the RS-485 transceiver
instead of the USB controller.
The USB cable provides power to the EV board when connected to the PC. If the USB cable not being used
+5VDC power must be provided at J16, pins 1 and 6 (+5V and ground, respectively). Do not supply power to
JJ16, pin1 AND connect the USB cable to the PC.
J22 RS-485 Connector Pin Assignment
J22 Pin Number Pin Name Pin Description
1 +5VDC Connect to external source
2 Data - P Tri-state, Bi-directional
3 Data - N Tri-state, Bi-directional
4 GND Connect to external source
4.3 Isolated UART, I
2
C, SPI Interfaces
The native host interfaces of the 78M6610+LMU are made available on the isolated side of the barrier at J16.