Sensotec PIM-3, Manual, Page: 27 / 97

Model PIM-3 6-1
Chapter 6
Command Format
One of two communications hardware interfaces are
available, RS-232 or RS-485. Instruments equipped with
the RS-485 two-wire interface can also be used in an RS-
422 four-wire type setup; thus this interface is sometimes
called RS-422/RS-485. Regardless of the type of hard-
ware interface used, the PIM-3 uses the same software
command set, the general format of which is described in
this chapter.
6.1 Baud Rate, Bits and Parity
PIM-3 Instruments always use 8 data bits, one start bit
and one stop bit and no parity bits (often described as
"N81") for serial communications. Baud rates of 300, 600
1200, 2400, 4800, or 9600 baud are available. As
shipped from the factory, PIM-3 Instruments are set to
communicate at 9600 baud. The baud rate can be
changed over the serial communications link using the
W1
system command. For details on changing the baud rate,
see the "
W1
" command in Chapter 10, "System Com-
mands."
The DEFAULT pin can be used to temporarily change
a PIM-3’s baud rate to 300 baud. See Chapter 4, “Mount-
ing and Wiring” for more information.