Vaisala WXT510 - Manual (Page 42)

User’s Guide ______________________________________________________________________
40 __________________________________________________________________ M210470EN-D
The terms "Default wiring" and "RS-422 wiring" refer to the two
internal wiring options, see the diagrams on the next page.
Internal Wiring
The 8-pin M12 connector is optional and hence may not be readily
installed. For retrofitting, make the wiring between the connector and
the screw terminal block according to one of the following pictures.
0505-205 Figure 18 Internal Wiring
The telecommunication modes RS-232, SDI-12, and RS-485 can all be
accomplished with Default wiring, whereas the 4-wire RS-422 requires
a different internal wiring (see also
Table 2 on page 39 ).
The RS-232 interface can be accessed with a standard PC ComPort,
right through the M12 connector. 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 WXT510. For testing purposes, the
inverted output of either interface (screw terminal pin #3 TX-) is
NOTE The true SDI-12 line requires that the Rx and Tx wires are joined
together (outside WXT510). See the interface diagrams in the next
section.