18F4550 digital input

[skimask]

"you're not using a MAX232 or at least a series resistor like the green manual says..."
Uhhh...oops. I am using a 22K resistor on the transmitter line of the serial port but not on the RTS. What value of resistors should I place on the RTS line?

Oh, and will my PIC work or is it completely trashed at this point?

Thanks.

-Mike

22K is good...same voltages on RTS/CTS, but remember, it'll be inverted from normal RS-232 standards since it's not going thru a MAX-232.

Pic might work, might not, easiest way to test is to write some code to make an LED on another port follow a switch put on the suspect port............then reverse the process...put an LED on the suspect port, put a switch on another port and make the LED follow that same switch.

[mbw123]

Wow, thanks Skimask, it appears to be working. I put the 22K resistor in and it is recognizing the voltage from the serial port.

The one thing I didn't understand is

"it'll be inverted from normal RS-232 standards since it's not going thru a MAX-232."

What will be inverted?

-MW

[skimask]

Wow, thanks Skimask, it appears to be working. I put the 22K resistor in and it is recognizing the voltage from the serial port.

The one thing I didn't understand is

"it'll be inverted from normal RS-232 standards since it's not going thru a MAX-232."

What will be inverted?

-MW

Well, the RX and TX lines are inverted from RS-232 standards right because you're not using a MAX232?
Which serial modes are you using? Probably an N2400 or some other inverted mode...
Aren't the RTS and CTS signals upside-down from what you'd expect (if they were true RS-232 standard signals)?

[mbw123]

"Which serial modes are you using"
I am using the HSERIN and HSEROUT commands. I haven't actually tested it yet because I've been working on RTS and CTS. Do I need to use SERIN and SEROUT with the inverted modes like you suggested? Again I haven't tested any of this yet.

The RTS and CTS appear to be correctly oriented, so I don't think I need to change that.

Thanks.

-Mike

[skimask]

"Which serial modes are you using"
I am using the HSERIN and HSEROUT commands. I haven't actually tested it yet because I've been working on RTS and CTS. Do I need to use SERIN and SEROUT with the inverted modes like you suggested? Again I haven't tested any of this yet.

The RTS and CTS appear to be correctly oriented, so I don't think I need to change that.

Thanks.

-Mike

It's all in the little green manual...