@bugg RAM holds calibration data for angle board, coefficients for servo board , etc ,etc .... They put it in RAM to make money on each battery replac...

@bugg @hvac ?ÿ There are two batteries, they both are powering ram, and there is DS1211 chip that select which battery it is. You measure both batte...

no, i got the latest one already.

@hi-staker call it whatever you want, still off from original topic Maybe people just want working paperweight, but working. Not with date 20 years o...

@jim-frame I think he said it with "tech junkie" 🙂 I have right now 2 total stations and 2 gps in RTK setup, old trimble 4000 and leica rx1250. I bou...

@keelan it could , but its easier for people to upload complete firmware. Less error prone.

@keelan 0x203 change from 0x0d to 0x05. done

there?ÿ is bit that will rechecksum the whole firmware for you 🙂

BTW, why hijack thread about Z receiver firmware with hate speech ? if you don't like those receivers or think that they are old bad heavy just .... s...

@hi-staker If radio is problem use external one. I have modified zmax radio module and put Lora-base DUT inside. Works very well.

Problem.is that I dont have access to Zsurveyor and Zxii firmware

I have no idea about 4400 geodimeter. Its different platform than these gdm 600 trimble5500/5600. ?ÿ Loader is active because there is no software i...

@unimogsaar try to read this whole thread ... there are clues on how to communicate with the loader, and how to make the dump.

i think that the software is the same between stations. First 3 numbers are: 817xxxxxx. Loader works with normal serial communication 9600,8,n,1. You ...

@jim-frame Yes, FTDI or Prolific. But even when they present themselves as FTDI or prolific there are knockoffs. That's why its better to buy from loc...

@jim-frame It easy with laptop also, just use USB-serial converter. Just don't buy cheap Chinese ones off ebay.

So if there is someone adventurous.. here is manual on how to "corrupt" but not corrupt the memory 🙂 (it will look corrupted for the cpu but in real...

loader output looks like this (9600 8n1): 51.8>113=698-02.00>698-02.00 commands: Load new program LV=0Memory ASCII-hex dump OV*GDM model RV,1...

@mike1202 so the command is "OV*" - dump memory, Other commands are: "RV,100" - GDM model "RV,110" - loader time and date "RV,111"- GDM serial nu...