AndyUK's Build - 1.2x1.0m Gantry

[AndyUK]

Wow thanks for that Doddy, I see what you mean now :)


What I think are the optoisolators (4pin IC directly above each output) have 838 written in small font above a larger central "P185". Bottom row is "GB JG".

Also, how the hell did that board get so dusty?

Measured the voltage but wrt 24V not ground (oops). Withe all drives on and connected, OSSD output off (i.e. fault condition drive should be disabled) I get 0V reading (so the OSSD pin is at 24V). With the OSSD output on (drives should enable) I get a reading of 23.3V (so OSSD pin is at 0.7V).

Connected a single drive to 5V and the OSSD pin without resistors, worked perfectly. Enabled and disabled the drive like a champ exactly as expected in both active low enable mode and active high enable mode (enabled in opposite situations obviously). Will try connecting all drives simultaneously next, and I guess worst case will just run them through a spare relay operated by the OSSD pin?