How can I interface to the Tau2 when the Photon Replicator board is installed? What are the RS-232 logic levels for a Tau using the Photon Replicator board?

Below is the pinout of the 30-pin connector on the Photon Replicator board. The Replicator Board does only some filtering of the RS-232 signals, so the electrical interface is the same as that of the Tau2. You can use full voltage RS-232 levels or CMOS logic levels (0 to +3.3V) directly from a UART. The Tau2 will only send CMOS logic level signals when it transmits.Unlike the legacy Photon, the Tau2 will automatically adapt to the polarity change when a UART is used directly.

Pinout of Photon Replicator Board



CONNECTOR PINOUT DESIGNATIONS
 

1

GND

16

SD_DATA+

2

GND

17

LVDS_VID1+

3

3.15V_OUT

18

SD_FSYNC-

4

PWR_IN

19

LVDS_VID1-

5

GND

20

SD_FSYNC+

6

GND

21

LVDS_VID0+

7

1.5V_OUT

22

SD_CLK-

8

N/C

23

LVDS_VID0-

9

RX2

24

SD_CLK+

10

RX

25

TEMP2

11

TX2

26

DISO_EXT

12

TX

27

DIS2_EXT

13

LVDS_VID2+

28

VIDEO_LO

14

SD_DATA-

29

DIS1_EXT

15

LVDS_VID2-

30

VIDEO_HI

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