Communicating With The Module - ICP DAS USA DGW-521 User Manual

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4.1 Communicating with the module

If you attempt to communicate with the module and receive no
response, first check the following:
Make sure the supplied power is within the range of +10 to
+30 V DC. If the supplied power is OK, then the power
LED should be on.
When the module receives a command, the power LED is
set to "off". The power LED is shown as "on" after the
module responds. This method can be used to check
whether the module has received a command sent from the
host.
If possible, use another device to check whether the host can
communicate with the device through the same RS-485
network.
If the host is a PC installed with a Windows operating
system, then execute the DCON Utility to determine
whether the module can be found. The DCON Utility can be
downloaded from the ICP DAS website
http://www.icpdas.com. The DCON Utility documentation
can be found in the "Getting Started For I-7000 Series
Modules" manual.
Set the module to "INIT mode" and communicate with the
module using the following settings: address 00, Baud Rate
9600bps, no checksum and DCON protocol. See Section
A.1 for details.
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