Fema B RTU Series, User Manual, Page: 17 / 36

FEMA ELECTRÓNICA . SERIES B . Models Bxx-RTU
17
1.21.2 Initial set-up
To configure the initial set up of the instrument, select the
working mode and configure the bus parameters.
The instrument has 2 working modes named ‘Full slave’ and
‘Process slave’. In both modes, the reading value is received
from the communications bus. The differences between
modes are related to how the alarms are controlled.
At the ‘
Working mode ’ (‘ ModE ’) parameter, select one of the
working modes.
• select ‘ Full slave ’ to control the alarms directly from the
communications bus, by writing to the internal instrument
registers. Analog outputs and other output and control
modules are controlled locally from the instrument.
• select ‘
Process slave ’ to control the alarms locally from
the instrument, by manually configuring the setpoint and
other alarm parameters. Analog outputs and other output
and control modules are controlled locally from the instru -
ment.
Configuration menus for both modes are slightly different.
The following sections will mention when a parameter applies
only to one of the modes.
Press ‘SQ’ (
<
) for 1 second to access the ‘
configuration
menu
’. For a description on how to operate inside the menus
see section
1.21.1
. For a full vision of the ‘
configuration menu
’
structure see section
1.22
.
Working mode
‘Process slave’ mode
‘Full slave’ mode
Speed
(kbps)
from 38.4 Kbps
...
...
to 600 bps
Bus
configuration
8 bits, no parity, 1 stop
Format
8 bits, even parity, 1 stop
8 bits, odd parity, 1 stop
8 bits, no parity, 2 stop
At the ‘ Bus configuration ’ (‘ buS ’) menu configure the bus
speed and the bus data format.
• at the ‘ Speed ’ (‘ bAud ’) parameter select the bus speed, in
kbps.
• at the ‘
Format ’ (‘ bItS ’) parameter select the bus format be -
tween ‘8n1’, 8e1’, ‘8o1’ and ‘8n2’.