Gardner Denver RSD Series Instruction Manual page 11

The dryer settings screen allows the customer to view/edit various
dryer set points and setup E-mail alerts that will send an e-mail to
up to 3 different e-mail addresses whenever an alarm or warning
occurs on the dryer.
Figure 4: Settings
2. Modbus TCP
The Modbus TCP connection allows you to continuously monitor
the dryer from a DCS system which implements a Modbus TCP
master. The dryer controller implements a ModbusTCP server
on port 502. The following Modbus register table provides a list
of data that is available.
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