9440300990 Rev J
161
DECS-250
Communication
Communication
Local Communication
A type B, USB port connects the DECS-250 with a PC operating BESTCOMS
Plus
®
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 BESTCOMS
Plus
.
Information about establishing communication between
BESTCOMS
Plus
and the DECS-250 is provided in the
BESTCOMSPlus Software
chapter of this manual.
Caution
In accordance with the guidelines defined in USB standards, the USB
port on this device is not isolated. To prevent damage to a connected
PC or laptop, the DECS-250 must be properly tied to ground.
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 136 and consist of the baud rate
A
, number of
bits per character
B
, parity
C
, and the number of stop bits
D
. 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.
Figure 136. RS232 Setup
A
Baud Rate:
Select 4800, 9600, 19200, 38400, 57600, or 115200.
B
Bits Per Char:
Select 7 or 8 bits/character.
C
Parity:
Select Even, Odd, or No parity.
D
Stop Bits:
Select 1 or 2 stop bits.
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