Fema B Series, User Manual, Page: 32 / 36

FEMA ELECTRÓNICA . SERIES B . Models Bxx-RTU
32
A wire
GND B wire
G A B
Module RTU
A Bus signal A
B Bus signal B
G GND
Figure 20 - Connections for Modbus ‘RTU’ communications module
Figure 19 - Communications module ‘RTU’
Protocol ASCII
Bus RS-485, up to 57.6 Kbps
Isolation 1000 Vdc
Terminal plug-in screw clamp, pitch 5.08 mm
Installation allowed at slot 1, slot 2, slot 3
The S4 module provides an isolated RS-485 ASCII communi -
cations port, to install in large format industrial meters from
Series B.
The S4 module implements a MASTER / SLAVE protocol, with
up to 31 addressable slaves. In SLAVE mode allows access
to reading values, alarm status, memory of maximum and
minimum, ...
Configuration is performed from the front keypad of the in -
strument, by accessing the menu entries ‘Opt.1’, ‘Opt.2’ or
‘Opt.3’, according to the slot where the module is installed.
Modules S4 can be provided factory installed into a Series
B instrument, or standalone for delayed installation. No sol -
dering or special configuration is required. See section
1.9
on
how to install output and control modules.
Protocol Modbus RTU
Bus RS-485, up to 57.6 Kbps
Isolation 1000 Vdc
Terminal plug-in screw clamp, pitch 5.08 mm
Installation allowed at slot 1, slot 2, slot 3
The RTU module provides an isolated Modbus RTU com -
munications port, to install in large format industrial meters
from Series B.
The RTU module implements function ‘4’ (‘
Read Input Regis -
ters
’) of the Modbus RTU protocol, to access the instrument
registers (reading value, alarm status, memory of maximum
and minimum, ...).
Configuration is performed from the front keypad of the in -
strument, by accessing the menu entries ‘Opt.1’, ‘Opt.2’ or
‘Opt.3’, according to the slot where the module is installed.
Modules RTU can be provided factory installed into a Series
B instrument, or standalone for delayed installation. No sol -
dering or special configuration is required. See section
1.9
on
how to install output and control modules.
2.5 Module RTU
Figure 21 - Communications module ‘S4’
A wire
GND B wire
G A B
Module S4
A Bus signal A
B Bus signal B
G GND
Figure 22 - Connections for RS-485 ‘S4’ communications module
2.6 Module S4
For more information:
http://fema.es/docs/4326_SERIES-B_OPTIONS_manual_en.pdf
For more information:
http://fema.es/docs/4326_SERIES-B_OPTIONS_manual_en.pdf