1
SDM-CD16AC 16 Channel AC/DC
Controller
1. Function
FIGURE 1-1. SDM-CD16AC face panel
The SDM-CD16AC has 16 AC/DC relay control ports (see FIGURE
). Each
relay port can be controlled by a data logger or controlled manually with a manual
override toggle switch.
The toggle switch has three positions:
ON
and
OFF
for manual override, and
AUTO
for data logger control. In the
ON
position, the common (
COM
) and
normally open (
NO
) contacts are closed (see FIGURE
). In the
AUTO
position, the state of the relays are controlled by the data logger control ports.
The SDM-CD16AC is a synchronously addressed data logger peripheral. Three
ports on the data logger are used to address the SDM-CD16AC, then clock out
the desired state of each of the 16 control ports. Up to 16 SDM-CD16ACs may
be addressed, making it possible to control a maximum of 256 ports from the
three data logger ports.
Compatible Campbell Scientific data loggers use the CRBasic instruction
SDMCD16AC()
to control the SDM-CD16AC.
