DigitalFlow™ DF868 Multipurpose Ultrasonic Liquid Flowmeter Programming Manual (2-Channel) 87
Chapter 6. Serial Communications
Chapter 6. Serial Communications
6.1 Introduction
The Model DF868 flowmeter is equipped with a standard RS232 serial interface. By using this interface, any log files
stored in the DF868’s memory may be easily uploaded to a personal computer. In order to accomplish this, the
following steps must be completed:
Note: See EIA-RS Serial Communications (916-054) for a more detailed discussion.
• Connect the DF868 to the personal computer
• Check the DF868 baud rate setting
• Set up the personal computer’s terminal software
• Transfer the log files to the personal computer.
This section also contains instructions for setting up an RS485 serial interface.
6.2 Wiring the RS232 Interface
The first step is to connect the built-in RS232 port in the DF868 to one of the serial ports (COM1 or COM2) on the
personal computer. Table 39 lists the standard cables available from the factory for this purpose.
Each of the cables listed in Table 39 is available in several standard lengths. However, a user-supplied cable may be
used, if preferred. In either case, wire the DF868 end of the serial cable in accordance with the pin designations listed
in Table 1 in the brochure, EIA-RS Serial Communications (916-054).
Note: For serial communications between a single DF868 and a single personal computer, no connections are
required to pins 4 and 5 of the DF868’s serial connector. However, these pins should be jumpered together to
ensure proper operation.
Table 39: Panametrics Serial Cables
Part Number PC Connector DF868 Connector
704-659 DB25 Male Flying Leads (5)
704-660 DB9 Male Flying Leads (5)
704-661 DB25 Female Flying Leads (5)
704-662 DB9 Female Flying Leads (5)
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