Serial Communications 6-1
March 2008
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.
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 6-1 below lists the standard cables available from the factory
for this purpose.
Each of the cables listed in Table 6-1 above 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 6-1: GE 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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