Hach Ultra MET ONE HHPC-6, User Manual, Page: 44 / 51

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Appendix A Data Communications
A.1 Remote serial interface (I/O port)
The MET ONE HHPC–6 is equipped with an RS232 communications port, an RS232
cable and an RJ45 connector. The RS232 communications port is used to communicate
with a PC to download data and for remote operation. The communication protocol
(ENGR
–
124) is available upon request for software development.
The specifications and wire pin-outs for the I/O port are:
• Baud rate: 9600 baud
• Data bits: 8 bits
• Parity: None
• Stop bits: 2 bits
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–6 is already configured as a Data Communication Equipment (DCE), so the use of
a null-modem cable is not required.
Figure 20 shows the cable pin diagram.
Figure 20 Pin layout for the RJ45 to DB9 connector cable