Vaisala Hydromet Data Collection Platform - Manual (Page 346)

User's Guide ______________________________________________________________________
344 _________________________________________________________________ M210933EN-C
Dual RS-485 Module DSI486, Version B
The later module version, DSI486-B, has otherwise the same features as
module DSI486-A, but its jumper settings are slightly different. The
settings have been simplified to make the module easier to use. Notably,
jumpers X4 and X5 still select the termination resistors for channels A
and B, respectively, only their locations have been moved a bit (see
Figure 179 on page 344 ).
0903-024 Figure 179 RS-232 Jumper Settings
Jumpers X3 and X6 are used to select between the RS-485 and RS-232
modes for channel B, but their settings have been simplified. The
jumper positions are described in
Table 77 on page 344 .
Table 77 Jumper Settings for DSI486-B
Jumper Connected
Pins Function
X3 1-2 Channel B RS-232 mode
2-3 Channel B RS-485 mode (default)
X6 1-2 Channel B RS-485 mode (default)
2-3 Channel B RS-232 mode
X4 1-2 Channel A RS-485 line terminating resistor
active
X5 1-2 Channel B RS-485 line terming resistor active.
Do not use in Rs-232 mode