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 Serial C & D don't work (Graphics Master)		  Forum Locked
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akidder

1519 Posts
Posted - 04 Mar 2002 :  19:36:39  Show Profile
Q: I can't get Serial Ports C or D to work on my Graphics Master

One reason may be that you are trying to connect to an RS-232 device to the ports. Serial C and D use 0 to 3.3V CMOS logic.

Don't ever connect Serial C or D directly to RS-232-level signals, as you can irreparably damage the UART (valid RS-232 levels are -25V to +25V, skipping the region between -3V and +3V).

If you need RS-232-level communications:
1. Consider using one of the other five available RS-232 ports
2. Use RS-232 level shifters to translate between the 3.3V CMOS level of the ports and RS-232 voltages.



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Drew Kidder
ADS Technology Transfer
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