The Z+ series uses standard programming interfaces, including RS232, RS485, and USB. Up to 31 units can be controlled in a daisy chain configuration, all accepting a global command. The baud rate is selectable. In addition to using software interfaces, the Z+ can be programmed using an external resistance or voltage, or the output levels monitored from an analog voltage. The resistance or voltage range can be selected via the front panel. In addition to the global commands, each individual Z+ unit can be turned on or off individually.