must be TTL to RS232 converter, I made it for my Zgemma H7, it is rebranded HD51, I took it from a defect VUplus, just added 4pin connector, works
Thanks. Ok, I must go to Ali shop or I must find my old interface for Nokia phones... Ali will be easier
Btw - for VU suffices RJ12 -> DSUB9
Edited by ims, 17 February 2020 - 20:32.