wiki:RS485_Board

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Design Files for Review

Layout Notes

This board provides a for-channel half-duplex RS-485 interface for up to 4 microcontrollers. This board would be similar in size to the microcontroller, with two rows of 0.1" spaced headers.

A proposed pin-out is given below.

Left ----- Right
1 GND GND 1
2 Tx1 Tx3 2
3 Rx1 Rx3 3
4 En1 En3 4
5 Tx2 Tx4 5
6 Rx2 Rx4 6
7 En2 En4 7
8 5V A 8
9 GND B 9

An RS485 transceiver such as the ST3485 (497-6540-1-ND) would be used (4 required) along with a 3.3V regulator. A and B are the RS-485 bus.

Last modified 6 years ago Last modified on Jul 12, 2016, 3:36:17 PM