1. Introduction
Figure 1-1. SDM-CD16ACA face panel
The SDM-CD16ACA has 16 AC/DC relay control ports (see
[p. 1]). 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
[p. 6]). In the AUTO position, the state of the relays are controlled by the
data logger control ports.
The SDM-CD16ACA is a synchronously addressed data logger peripheral. Three ports on the data
logger are used to address the SDM-CD16ACA, then clock out the desired state of each of the 16
control ports. Up to 15 SDM-CD16ACAs may be addressed, making it possible to control a
maximum of 240 ports from the three data logger ports.
Compatible Campbell Scientific data loggers use the CRBasic instruction
SDMCD16AC()
to
control the SDM-CD16ACA.
NOTE:
The SDM-CD16ACA is an improved version of the SDM-CD16AC with better individual
contact ratings. Both the SDM-CD16ACA and the SDM-CD16AC are controlled with the same
CRBasic instruction,
SDMCD16AC()
.
SDM-CD16ACA 16 Channel AC/DC Controller
1
