Vaisala WINDCAP WMT52 Guía de usuario descargar pdf (Pagina 45)

Chapter 5 _______________________________________________ Wiring and Power Management

VAISALA_______________________________________________________________________ 43

Internal Wiring

The 8-pin M12 connector is wired for RS-232, SDI-12, and RS-485

modes by default. The 4-wire RS-422 requires a different internal

wiring (see also Table 1 on page 42). Refer to the figure below if you

need to change the wiring of the M12 connector.

0505-205

Figure 22 Internal Wiring

The RS-232 interface can be accessed through the M12 connector using

a standard PC serial port. Same applies to the SDI-12 interface, since the

Rx and Tx lines are separate at the M12 connector.

Bidirectional use of the RS-485 and RS-422 interface requires a proper

adapter module between the PC and the WMT52. For testing purposes,

the inverted output of either interface (screw terminal pin #3 TX-) is

directly readable with PC's Received Data line. In this case Signal

Ground for PC ComPort is taken from screw terminal pin #6 SGND (for

testing purposes pin #19 VIN- will also do).

For configuration work, the Service Port is most practical, since it has

constant and convenient line parameters: RS232/19200, 8, N, 1. See

Chapter 6, Connection Options, on page 51 and Figure 3 on page 18.

NOTE

The true SDI-12 line requires that the Rx and Tx wires are joined

together (outside the WMT52). See the interface diagrams in the next

section.

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Vaisala WINDCAP WMT52 Guía de usuario Pagina 45