[Elecraft] Remote Rig without local K3 ?

[Jim Miller KG0KP]

I am considering a second K3 and wondering if I can use the Remoterig system 
with a computer and HRD/DM780 but without the K3 or K3-0 on the local end 
until I can afford the second K3 or do I need to wait until I can get the 
second radio?

Will it do digital as well or is there timing or something from the local 
rig required for the digital operation?

Thanks es 73, de Jim KG0KP