i have a GM-862 PY with the RS-232 eval board -
the current version of this board doesn’t allow a script to be loaded onto the module
does the USB eval board get around this problem?
ne help or suggestions is much appreciated!!
THX in advance!
Ah, this is the question I have been asking myself … All the documentation relating to script download sates that hardware hand shaking must be used, though at a chip level ( USB to serial) this is not enabled. If using hyperterminal to download the script, there is no handshaking, therfore hyperterminal does not think that CTS has been asserted, hence … no download. I have tried enablied Xon/Xoff at both the PC end and at the GM862, but to no avail. I shall continue to fiddle, but if I do not have any joy soon, I will wire the RTS / CTS and TX /RX pins to a DB9 and use a conventional serial connection… this will allow for hardware hand shaking as all of the documentation seems to insist on using…
I am not familiar with the USB driver (SFE_USB) and do not know if this simulates handhaking at a data transport layer, so talking directly to the GM862 may prove whether or not this is the case…
the rs232 eval board has all those pin outs as well but i thought there was a need for a bigger (one that includes RTS & STS I/O’s) step-down voltage transformer than is on the board for downloading - that you couldn’t just wire the pins directly to the serial plug
i don’t know for sure so if anyone has a better guess than mine i’m all ears!
I will be using a RS232 level converter to interface between the 3.8 volt GM862 logic and the PC serial port. Given that the handshaking pins are available on the GM862 pcb, this should fullfill the requirement for h/w handshaking when loading the python script file into the module. …
the only converter i found that i thought would work was just a chip which meant i would have to get a board and some involved soldering - i just didn’t think i wanted to get that deep
if you have an easier solution let me know
thx
It works !!! I cobbled together an off-board level converter (TX, RX, CTS, RTS) hooked it to the usb breakout board, and voila, I have now downloaded a script to the GM862. Reading the script from the GM862 confirms all is OK. I will now work on the script to write the function set (request GPS data via sms) and give it a spin …