LPC2000 RS232/UART broadcasting

Started by marks1865 August 19, 2008
morning,

I've an RS232 device (PC) that I want it to be able to broadcast
messages to several ARM7 devices. It's only one way messages; I'm not
interested in having the ARM7 send back data.

After I convert the RS232 back to TTL (eg MAX232 device) on the ARM7
side, can I simply wire the MAX232 Tx pin to all ARM7 UARTS Rx pins and
have them all receive the broadcast message (ie multi drop style?)

Ok, I might need a bit of glue to connect the MAX232 device, but I
guess that depends on the RS232/TTL converter chip and its Tx fanout?

ie

[RS232 Device]--->----[RS232/TTL Converter]->-+----+----+
| | |
Rx Rx Rx
ARM7 ARM7 ARM7

cheers
Mark

An Engineer's Guide to the LPC2100 Series

> I've an RS232 device (PC) that I want it to be able to broadcast
> messages to several ARM7 devices. It's only one way messages; I'm not
> interested in having the ARM7 send back data.

I even made ad hoc networks on a game console (Atari Lynx if someone
remembers) like this.

> [RS232 Device]--->----[RS232/TTL Converter]->-+----+----+
> | | |
> Rx Rx Rx
> ARM7 ARM7 ARM7

--
42Bastian

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