MSP430FR5969: Multiple Transmitter and single receiver in UART?

For UART serial, the transmitter is expected to drive (not pull) the TX line high/low. With multiple transmitters, there will be a bus conflict, and you'll get artifacts like 1.5V levels on the wire.

It's possible to imagine UART-serial running over an open-drain-ish bus (electrically analogous to I2C), but I haven't seen it done and I'm pretty sure the MSP430 wouldn't know how.

Anil Dhanawade said:

Part Number: MSP430FR5969

Is it possible to receive the data on the RX(UART) pin of MSP430, by using 2 different TX lines.?

Like I have MSP1,MSP2, MSP3. MSP3 is a RX and MSP1 & MSP2 is the transmitter (UART). SO both MSP1 & 2's TX pons are connected to RX pin of MSP3. Is it possible? 

if YES then how it works and NO then why no?

For this I will use mailbox system data exchange during runtime. One master device, and 3 (or more) slaves, without problems. Sending double world at once, not byte by byte. SBW will take 2 (not used for anything else) lines (TEST / RESET) on target devices, without occupying any hardware peripheral on master / slave devices.

Or I2C, if there are pins on target device free / available, and there is no possibility that communication lock the buss.

Hi Bruce,

First Line:

MSP1 is TX data, then it goes to RX of MSP3 and TX of MSP2. So how the conflict will happen? RX is receiving the data, then how that things are affected to TX pin.

Can you please give me some more detailed information.

Second Line: 

I am not getting what you actually wants to say. Please give me the information about it.

Thanks 

Anil D.

hello Bruce,

you are talking about the assumption,

lets take one assumption.

alternatively data will be send, like MSP1 send at x time and MSP2 is send at another time. then its possible?

In determinant condition will occur when 2 MSP's (1 & 2) are sending the data at the same time?

Ok thanks 

Regards 

Anil D.