11. Unit Configuration Concepts
11.1 Port and Protocol Configuration
Each of the communication ports can be individually configured or enabled/disabled. It is important to note that the ports function independent of one another, and can operate simultaneously. For example, a Modbus RTU slave request on RS485A, and an ASD1 request can simultaneously access the same internal point.
Although each communication port can be configured via the serial console interface, their configuration selections vary slightly. The Toshiba ASD common serial ports have a simple enable/disable selection. The RS232 and RS485 ports can be disabled, or can have one of a selection of control protocols assigned to them.
Along with the protocol selection for the RS232/RS485 ports, each of these ports also has a corresponding baudrate, parity, address assignment and timeout time assignment. Note that not all assignable protocols support the same range of configuration options: therefore be sure to assign a valid entry in all cases (for example, a Modbus RTU slave’s “address” assignment must be in the range
11.2 Timeout Configuration
The gateway’s points can be configured to perform a specific set of actions when primary communications are lost on one or more of its various networks. This allows each point to have its own unique
•A port’s network timeout time
•A point’s “Timeout Enable” selection
•A point’s “Timeout Value” setting
The timeout time is adjustable in 1s increments from 0 to 500s.
The default timeout time in all cases is 0, which disables network timeout handling. When nonzero, timeout processing does not begin until after a valid network packet has been received by the unit on that port.
When the timeout time is nonzero and a communication interruption is detected, the timeout enable selections for each point are inspected. Those
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