Vaisala Hydromet Data Collection Platform - Manual (Page 32)

User's Guide ______________________________________________________________________
30 ___________________________________________________________________M210784EN-E
The SDI-12 channel has its own connecting point on the board. It does
not use channel A or B for the communication. SDI-12 is galvanically
connected to the host board's GND potential.
There is a later version of this module, DSI486-B, that widens the
operating range and usable RS-485 line speed. The later version has the
same functionality as the original one and can be used as a drop-in
replacement without changes to the system configuration. Note that its
jumper locations and settings are slightly different.
Fixed Line Modem Module
The fixed line modem module is used for providing a long-distance
fixed line connection between two Vaisala devices with a similar
interface. It is used when the distance is up to 10 km, for example,
between the QML logger and a digital display, or between a ceilometer
and the logger. Through this I/O port, a remote location can send reports
and data or the host can poll them. The fixed line modem module must
be configured before use.
0306-013 Figure 11 Fixed Line Modem Module DMX501
The fixed line modem module supports the following communication
standards:
- V.21, 300 bps FSK
- V.23, 1200 / 75 bps FSK
- V.22, 1200 bps DPSK