I do not get it..

CH1 and CH2 do not offer a readCurrent and CH3 does dot offer a readVoltage. Those are from the input channels 1, 2 and 3.
The output channels: 1, 2, 3 are not linked. You can link them physically but they work independenty.
Also I have made all output channels on/off switchable. scpi: toggleVoltageCH1. toggleVoltageCH2 and toggleCurrentCH3.
How can I map them to #interface setOn ?
I can use #interface setOn toggleVoltage(getElement("CH1;CH2", value) (channel) but CH3 is not called Voltage, but Current. Do I need to change my scpi names ?
I currently have no command for #interface getOn but I can write it.
Also #interface getVoltage setVoltage(getElement("CH1;CH2", value) (channel) should be #interface getVoltage setVoltage(getElement("CH1;CH2", value)? (channel) I recon. (? was missing, my mistake)