1. LAN port 7. AC inlet
2. USB device 8. Fuse
3. Digital I/O port 9. Fan Opening
4. USB host 10. CH1/2 output ports, sense terminals
5. CH3 output ports, sense terminals 11. GPIB/RS232 port
6. AC selector
Note regarding GPIB and RS232 - GPIB and RS232 share the same port. The optional GPIB interface can be installed in place of the RS232 interface.