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Subject: RS232 activity
Posted by: rick
E-mail: canuslupus(at)mediaone(dot)net(no spam)
I'm looking for a simple circuit that
illuminates an LED when either TxD or
RxD are active. I'm thinking of simply
using a NAND gate to drive an LED. Since the resting state of the TTL side is always high, any activity will always be preceeded by a low going signal(start bit). Someone suggested to me to also use
a one shot in conjunction with it if I'm
using this in a circuit that's 9600 or >
as it'll be difficult to observe such a fast bit rate. Thank you
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