Hach Ultra MET ONE HHPC-2, User Manual, Page: 35 / 42

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Appendix A Data Communications
A.1 Remote serial interface (I/O Port)
The MET ONE HHPC–2 comes with an RS232 communications port, an RS232 cable
and an RJ45 connector. The RS232 communications port is used to communicate with a
computer to download data and for remote operation.
The specifications and wire pin-outs for the I/O port are:
• Baud rate: 9600 baud
• Data bits: 8 bits
• Parity: None
• Stop bits: 1 bit
A.1.1 DB9 serial connection
If the computer or terminal has a 9-pin serial port with a female connector, use the
modular RJ45 to DB9 connector provided along with the RS232 cable. The MET ONE
HHPC–2 is configured as a Data Communication Equipment (DCE), so the use of a
null-modem cable is not required. The cable pin assignments are shown in
Figure 17 .
Figure 17 Pin layout for the RJ45 to DB9 connector cable