[Official] L1Techs KVM FAQ -- Ultimate Guide & Help!

[Level1_Amber]

@belthesar

If so, is there documentation of how to send signaling to the KM over serial I could look at?

Here I believe is what you’re looking for:

@Level1_Amber

Serial Commands

Edit Table

Serial Command	Function
K= 1~4 ( + Enter)	Select KM (Console) Port 1~4
K < ( + Enter)	Select KM (Console) Previous Active PC Port
K > ( + Enter)	Select KM (Console) Next Active PC Port
U = 1 ~ 4 ( + Enter)	Select USB 3.2 Ports = Port 1~4 (Stop Following)
U = * ( + Enter)	USB 3.2 Ports Follow KM (Console) Selection *Default
U + $ ( + Enter)	USB 3.2 Ports Stay at Current Port (Stop Following)
A = 1~4 ( + Enter)	Select Audio Port 1~4 (Stop Following)
A = * ( + Enter)	Audio Follow KM (Console) Selection *Default
A = $ ( + Enter)	Audio Stays at Current Port (Stop Following)
N = 1~4 ( + Enter)	Select LAN Port 1~4 (Stop Following)
N = * ( + Enter)	Net Follow KM (Console) Selection *Default
N = $ ( + Enter)	Net Stays at Current Port (Stop Following)
H = R ( + Enter)	Restart the KM Switch
B = 1~4	Equal to Pressing Front KM Button 1~4
B = S / A / N / U	Equal to Pressing: SYNC Button (S), Audio Button (A), NET Button (N), or USB 3.2 Button (U)
B = a1 / a2 / a3 / a4	Equal to Pressing: Audio Button (hold) + PC 1~4 + SYNC Button
B = n1 / n2 / n3 / n4	Equal to Pressing: Net Button (hold) + PC 1~4 + SYNC Button
B = u1 / u2 / u3 / u4	Equal to Pressing: USB 3.2 Button (hold) + PC 1~4 + SYNC Button
B = sA / sU	Equal to: Pressing: SYNC Button (hold) + Audio Button / UBS 3.2 Button
B = sN1~4	Equal to Pressing: SYNC Button (hold) + NET Button + PC 1~4

---

@belthesar

• USB ports
• How much power is provided to each USB port? I’ve been entertaining buying one of these KM switches for a while to enable me to add automation to my existing KM switch workflow, but what’s pushed me over the edge was the purchase of 2 Keychron keyboards that have internal batteries charging over their USB ports, which ended up causing brownouts on my existing bus-powered USB switch.
• In the event we’re looking at an insufficient amount of power for these keyboards, given that I’m likely going to need a USB Hub anyway to connect all the devices I’m going to want to switch, are there any concerns or gotchas I should be aware of wrt using a Hub? The ones I am aware of are:
  1. Don’t anticipate a USB Hub working on the HID ports
  2. Avoid large hubs that might be a daisy chain internally.
• Ethernet Adapter and Audio DAC
• I don’t plan on using this functionality. Is there a way to disable it?

@wendell can you give us insight on any of this?