9440300990 22-1
DECS-250 Communication
22 • Communication
Local Communication
A type B, USB port connects the DECS-250 with a PC operating BESTCOMSPlus
®
for local, short- term
communication. This mode of communication is useful for settings configuration and system
commissioning. The USB port is located on the front panel and illustrated in the Controls and Indicators
chapter of this manual. A USB device driver for the DECS-250 is automatically installed on your PC
during the installation of BESTCOMSPlus. Information about establishing communication between
BESTCOMSPlus and the DECS-250 is provided in the BESTCOMSPlus Software chapter of this manual.
This product contains one or more nonvolatile memory devices. Nonvolatile
memory is used to store information (such as settings) that needs to be
preserved when the product is power-cycled or otherwise restarted.
Established nonvolatile memory technologies have a physical limit on the
number of times they can be erased and written. In this product, the limit is
100,000 erase/write cycles. During product application, consideration should
be given to communications, logic, and other factors that may cause
frequent/repeated writes of settings or other information that is retained by the
product. Applications that result in such frequent/repeated writes may reduce
the useable product life and result in loss of information and/or product
Communication with a Second DECS
BESTCOMSPlus Navigation Path: Settings Explorer, Communications, RS232 Setup
HMI Navigation Path: Settings, Communications, RS232 Setup.
Communication with a second DECS enables regulation setpoint tracking to occur in a dual, or
redundant, DECS application. External setpoint tracking is possible between a DECS-250 and second
DECS-250 or a DECS-250 and DECS-200.
All DECS controllers mentioned here use a female DB-9 (RS-232) connector for communication with a
second DECS. On the DECS-250, this connector is located on the right side panel and is illustrated in the
Terminals and Connectors chapter of this manual. A five-foot (1.5 meter) cable, part number
9310300032, is available for interconnecting two DECS controllers.
RS-232 port communication settings are illustrated in Figure 22-1 and consist of the baud rate, number of
bits per character, parity, and the number of stop bits. When connecting the DECS-250 to a DECS-200,
you must ensure that the communication settings of the DECS-200 match those of the DECS-250.
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