B&K Precision 1688B - Manual - Manual (Page 10)

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3.2 Rear Panel
Figure 2 - Rear Panel
(7) Main Output Terminal (max 5 A for 1685B / 10 A for 1687B / 20 A for 1688B)
Note: Please see Section 4.1.4 for more details on using both main and
auxiliary output terminals together.
(8) Mode Selection Switch (Normal, Preset, Remote Control, Set Modes)
(9) Recall Preset Selection Switch
(10) Analog Remote Control Terminal
(11) Cooling Fan Air Intake Grille
(12) AC Input Plug and Fuse Compartment
(13) USB Port (for PC remote control)