Wiring of the junction box – Vaisala GMP343 User Manual
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Chapter 3 _______________________________________________________________ Installation
VAISALA_______________________________________________________________________ 25
There are two pins per signal internally hardwired in parallel (pins 1 and 2,
pins 3 and 7). You should connect the RS-232C signal 'TX' (or 2-Wire RS-
485 signal 'A') either to the pin 1 or 2 and the RS-232C signal 'RX' (or 2-
Wire RS-485 signal 'B') either to the pin 3 or 7.
Note that there is either an RS-232 or a 2-wire RS-485 communication
interface available according to initial configuration. However, if the
device is configured in RS-485 output mode, the device can still be
switched into RS-232 mode by re-configuration via PC. For more
information on serial commands and RS-232/485 modes, see
.
Wiring of the Junction Box
The optional 8-pole junction box enables practical in-line connection. The
box is provided with 8 numbered terminals.