Sigma SA-5 - Page 26

3. REMOTE CONTROLLER MODE (C3)
Select this mode when using the optional remote controller RS-11 or RS-21. This mode has three channels but
if you use with RS-11 you should set to "C1". See
The remote controller mode will be cancelled if you set the mode dial to the "L" position.
FIXED AND SELECTABLE FUNCTIONS IN THE * MODE