DIO1: Ethernet/USB/RS232 Digital Interface.....$300
Can be used to monitor and/or control output voltage and current. Includes isolated Ethernet (10/100 Mbps), RS232, and USB (RS485 option “DIO2” available) interfaces, utilizing 16 bit DAC and ADC. (Not available DIO2 option.) Download Instruction Sheet & Drivers

DIO2: Ethernet/USB/RS232/RS485 Digital Interface.....$330
Can be used to monitor and/or control output voltage and current. Includes isolated Ethernet (10/100 Mbps), RS232, RS485 and USB interfaces, utilizing 16 bit DAC and ADC. (Not available with DIO1 option.) Download Instruction Sheet & Drivers

H: Handles.....$45

G1: Relay Alarm Contacts.....$90
NC/C/NO relay contacts that change state when output voltage drops more than 10% below nominal.

S: Chassis Slides (Rack Mounting models).....$90
For racks having rear mounting rails spaced 20" to 26" behind the front panel.