Hello guys,
I think i need some help with this, i have a CR800 with some SDM devices connected (SDM16AC,SDMSW8A,SDMCD16D), i need to connect a AM25T and AM16/32B to read some termocuples and aditional sensors, so i have the next doubts:
1.- As the CR800 only have 4 control ports, and need 3 control ports (C1,C2,C3 in example) for the SDM devices,i want to use the control port outputs of the SDMCD16D to control the clock and reset of the AM25T and the AM16/32B, reading the manual of the AM16/32B i see that i can control the Reset and clock to make readings on different channels of the multiplexer, so i think this could work with the AM16/32B, but with the AM25T there is a "instruction on CRBasic" to make measurements on the AM25T and this instructions control the measurement (and control ports of the logger), how i can control the AM25T using the SDMCD16D????
2.- There is other way to control the SDM devices and the AM25T and the AM16/32B with the CR800??
3.- Do you have other suggestions????
Any help will be apreciated, hope the idea is clear
Best Regars
Hello guys wath do you think of this:
Use C1, C2 and C3 for SDM devices
Use C1 and C4 for AM25T
As i read when C3 is high the SDM comunication will start, C2 will be the clock and C1 the data, for the AM25T C4 will be the reset line (i supose when C4 is high the AM25T will be activated) and C1 will be the clock.
So:
1.-when SDM instructions in the program will be executed i will put the port C4 on low (so the AM25T will do nothing), 2.-when AM25T instruction will be executed in the program C2 and C3 will be low (SDM instruction puts this ports on low after each cycle) so any change in the C1 port will do nothing to the SDM devices.
3.- For the AM16/32B will be use 2 control ports of a SDM-CD16D.
I will try this on wednesday (when i have in my hands all the equipments), you think could work???, or use the C1 control port for SDM and AM25T in the same program could damage any equipment??
thanks
Best Regards
* Last updated by: XxVashxX on 5/13/2013 @ 4:17 PM *
Hello guys,
i just made a small program to try to compile this, but an error says that the control port C1 is in use, so the program cant be compiled :(
So: I supose the instruction AM25T is a function programed in CRBasic to facilitate our lifes, but is possible to know how the AM25T instruction work (or if possible the code of this instruction)? so i can try to emulate the reset line, and clock line behavior of the instruction AM25T() using the SDM-16CD16 module to read the AM25T termocuples
Any help will be apreciated
You can drive the AM25T more of less in exactly the same way as the other multiplexers using a clock and reset line. If you study the manual you will see a description of how it is driven like this for our older loggers (section 6.2 Edlog programming).
The slight differences are the first set of clocked measurements deal with the PRT in the AM25T and thereafter you need two clock cycles to move onto the next channel, as opposed to one with the AM16/32.
For your setup I suggest you use the spare control port as a common shared clock line for the both mulitplexers and two channels on the CD16D for the reset (enable) lines on the multiplexer as you only need to set and reset them once for each multiplexer.
Hello Andrew,
You are right,
Check the manual again and found the information I needed (I do not know why I did not find this information before, perhaps because I read many manuals at once and not read it with the care it should), I apologize to the unnecessary question, all the information was there!
thanks again