Maxim-integrated 78M6610+LMU Evaluation Kit Manual do Utilizador descarregar pdf (Página 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

C, SPI Interfaces

The native host interfaces of the 78M6610+LMU are made available on the isolated side of the barrier at J16.

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 31 32

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