Vaisala WXT530 Series - ASCII Protocol

When you connect the USB service cable between the service connector and PC USB port,
the service port se
ttings are forced automatically to RS-232 / 19200, 8, N, 1, and the main
serial port at the M12 connector at the screw terminals is disabled.
1. Use the USB service cable to establish a connection between the USB port of your PC
and the M8 service port connector on the bottom plate of the transmitter.
2. Open the Vaisala Configuration Tool or a terminal program.
3. Selec
t the COM port reserved for the USB cable and select the following default
communication settings:
19200, 8, N, 1.
4
.
Use the Vaisala Configuration Tool or a terminal program to make the configuration
changes.
5.
When removing the service cable, support the transmitter while pulling the 4-pin M8
connector for service port. The connection is tight, and it is possible to change the
alignment of the transmitter if you pull too hard.
Changes to the serial interface/communication protocol/baud settings take place when
you disc
onnect the service cable or reset the transmitter.
If these settings are not changed during the service connection session, the original main
port settings (at M12 and screw terminals) are returned when the service cable is
disconnected from either end.
More Information
‣
C
ommunica
tion Setting Commands (page 72)
6.3.1 Connecting through M12 Bottom Connector or Screw
T
erminal
Y
ou can check and change the device settings through the 8-pin M12 bottom connector or
scre
w terminal.
To do this, you must know the device communication settings, have a suitable cable
between the device and the host, and, if needed, use a converter (for example, RS-485/422
to RS-232, if the host is a PC). The following table shows the factory default settings:
Table 17 Default Serial Communication Settings for M12/Screw Terminal Connection
Serial Interface Serial Settings
SDI-12 1200 baud, 7, E, 1
RS-232 ASCII 19200 baud, 8, N, 1
Chapter 6 – Connection Options
71
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