Table of Contents
Advertisement
FEMA ELECTRÓNICA . SERIES B . Models Bxx-C1
2.5 Module RTU
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 1.6 on
how to install output and control modules.
Figure 20 - Communications module 'RTU'
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
B wire
A
Bus signal A
B
Bus signal B
G
GND
Figure 21 - Connections for Modbus 'RTU' communications module
For more information:
http://fema.es/docs/4326_SERIES-B_OPTIONS_manual_i.pdf
32
A wire
GND
B
A
G
Module RTU
2.6 Module S4
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 1.6 on
how to install output and control modules.
Figure 22 - Communications module 'S4'
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
B wire
A
Bus signal A
B
Bus signal B
G
GND
Figure 23 - Connections for RS-485 'S4' communications module
For more information:
http://fema.es/docs/4326_SERIES-B_OPTIONS_manual_i.pdf
A wire
GND
B
A
G
Module S4
Advertisement
Table of Contents
