Where are the specs for older hardware?

[sinned6915]

I am looking for the descriptions of the hardware capabilities for versions lower than Duet2 1.04. I am looking at this page, specifically for Z-Probe and endstops.

https://docs.duet3d.com/Duet3D_hardware/Duet_2_family/Duet_2_WiFi_Ethernet_Hardware_Overview

Inputs/Outputs	5 on-board I/O connectors for endstop and filament monitors (STP pins are 8V-tolerant on 
revision 1.04 and later), 7 more on expansion header
...
Z probe connector	4-pin with IN/GND/MOD/3V3 pins (IN pin is 30V-tolerant in revision 1.04 and later)

What voltage will the endstop pins and Z-Probe tolerate on earlier versions?

I would request that the data tabled be expanded with tabs for each of the milestone revisions.

I tried internet archive for board specs too, but could not find anything.

[jumpedwithbothfeet]

@sinned6915 Try this

https://duet3d.dozuki.com/Wiki/Hardware_Overview

[sinned6915]

@jumpedwithbothfeet The link to V1.03 and below on that page is broken

https://duet3d.dozuki.com/Wiki/Hardware_Overview#Section_V1_03_and_earlier_feature_diagram

I have been scouring and scouring for info on versions <1.04.

reprap.org has what I think is V1.0

[dc42]

@sinned6915 you can see the differences between board revisions at https://docs.duet3d.com/Duet3D_hardware/Duet_2_family/Duet_2_WiFi_Ethernet_Hardware_Overview#pcb-revision-history

[sinned6915]

@dc42 thanks.

I am trying to chase down the input voltage on probes and endstops.

I see that on V1.04 that it was bumped to 8V/30V, but from what I don't know. I assume 3.3V, but I was trying to verify.

To be safe, I fabbed up a little logic level shifter with a couple of restistors and transistor and put inbetween.

[droftarts]

@sinned6915 I knew I'd seen it somewhere, and finally found the answer, at least for the endstop pins: https://docs.duet3d.com/User_manual/Connecting_hardware/Sensors_endstops#maximum-input-voltage-on-stp-pin

Maximum input voltage on STP pin
Duet 2 WiFi/Ethernet hardware rev 1.04 and later: 8.3V. Higher voltages may damage the endstop LED.
Duet 2 WiFi/Ethernet hardware rev 1.03 and earlier: 3.3V (in practice a little more is unlikely to damage the Duet)

I'm still not sure what the input voltage limit is on the probe, though. Though I'm pretty sure older boards (except my white PCB pre-production one, which may be limited to 3.3V) work fine with BLTouch probes in open-drain mode, which is 5V.

Ian

[sinned6915]

@droftarts THANK YOU!
I am glad I made and installed the little logic shifter in there.