mesa board 7i77 analogue input

insert in my hal file these row:

loadrt hm2_pci config=" num_encoders=4 num_pwmgens=0 num_3pwmgens=0 num_stepgens=0 sserial_port_0=200xxxxx "

can read analogue input ... but how wire it? because I try to connect a sensor that send me 0-5V signal .... so can connect GND of sensor to TB2 power field GROUND and connect other signal (+5V) to INPUT0 for example? ... because before wire I would make me certain to not fire some input line. And can grab somethings of intelligent or resolution can be too low?

Regards
bkt

bkt wrote:

 .... so can connect GND of sensor to TB2 power field GROUND and connect other signal (+5V) to INPUT0 for example?
 

Yes, I'm using this and this is how to connect it. But resolution is only 8 bits and accuracy is +-5%. 

Have you seen this on page 17:

ANALOG INPUTS
All field input pins are capable of reading the input voltage. These are not highly
accurate or high resolution but can be useful for things like potentiometer inputs. Input
resolution is 8 bits and input full scale value is 36.3V. Accuracy is +-5%. Software process
data modes 1 and 2 allow reading the analog voltage on inputs 0 through 3, in addition to
the 32 digital bit inputs. 

PCW confirmed to me that this should read data mode 1,2 or 3  (not just data mode 1 or 2). Also I'm really puzzled about where the 36.3v come from. I'm using this to read a pot ( 0 - wiper - field voltage ) and this is good enough for that.

Just wanted to add that the 7i87 is much better, if you need better precision and more channels.

need to read 0-5V signal at 20mA ..... when can see 0-1-2-3-4-5V signal is enought for me ... no more of these pecision ....

bkt wrote:

need to read 0-5V signal at 20mA ..... when can see 0-1-2-3-4-5V signal is enought for me ... no more of these pecision ....

The mesa analogs are full scale @36 volts. (well the 7i76e is)
I would use a LM358 signal amplifier to step up to 20-22 volts max given a 24v reference voltage. You can get pre built modules from eBay/Amazon/AliExpress for $2 or less.

How can set data mode 1,2 or 3?

these row is not enought?

need to set mesa driver?

Data mode is set via sserial_port_0=200xxxxx of your row. This is for mode 2.
To set mode 1 simply replace with sserial_port_0=100xxxxx

Once done, for mode 1, 2 or 3, you should be able to find pins name ending with something like 7i77.0.0.analogin0 to 7i77.0.0.analogin3  with 'show  HAL configuration'.


 

thanks to all .... solved my problem