Interfacing two serial devices with AT89S52

[Manu]

I have two serial devices SM630 and MAX232. I have to interface these two with MCU if directly interfaced data from both devices may mixup and when MCU is communicating with SM630 at this time it is better to switch off communication with MAX232 and vice versa how to do this please give a solution.

[SHAH DISHANT H.]

Hi,

 

You have two options.

 

1. RELAY

 

Connect controller data bus on common point of relay output and pins of ur modules on NO and NC point. By switching relay, you can select device to communicate with from controller driven relay.

 

2. MUX/DEMUX

 

When you have to use more than 2 devices on UART, you can use MUX and by selecting pins of MUX, you can use those on single UART.

 

I hope this solves your query.

 

Fell free to write back if required.

[Author]

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