4. Communications
The Serinus has a number of different interfaces for communication with other equipment (RS232,
USB, 25 pin digital/analog input/output, TCP/IP network (optional) and Bluetooth). A demonstration
version of Ecotech’s Airodis software is included with the instrument, enabling basic data downloads
and remote operation from a PC running a supported MS Windows operating system. The full version
of Airodis is available separately and includes automated data collection, data validation and complex
reporting by multiple users. Refer to the Airodis Manual and Section 4.6 of this manual for details on
setting up and communicating with the instrument.
Figure 78 – Communication Ports
4.1 RS232 Communication
RS232 communication is a very reliable way to access data from the instrument and is recommended
for use in connection to a data logger for 24/7 communication. Both RS232 ports are configured as
DCE and can be connected to DTE (Data Terminal Equipment such as a data logger or computer).
Port #2 also supports a multidrop arrangement (a configuration of multiple instruments connected via
the same RS232 cable where the transmit signal is only asserted by the instrument that is spoken to).
For reliable multidrop RS232 communications follow these guidelines:
Verify that the Serial ID is set to a unique value which is different to the other instruments
in the chain (refer to Section 3.4.24).
All of the instruments in the multidrop chain must have the same baud rate and
communication protocol settings. A maximum of 9600 baud rate is recommended.
The multidrop RS232 cable should be kept to less than three meters in length.
A 12K ohm terminating resistor should be placed on the last connector of the cable
(connect from pin 2 to pin 5 and from pin 3 to pin 5 – refer to Figure 79).
The shielding of the multidrop cable must be continuous throughout the cable.
The shielding of the multidrop cable must only be terminated at one end. It should be
connected to the metal shell of the DB 9 way connector.
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