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

FEMA ELECTRÓNICA . SERIES M . M60-LC
32
Protocol ASCII
Type of bus RS-485, up to 57.6 Kbps
Isolation 1000 Vdc
Type of terminal plug-in screw terminal, pitch 5.08 mm
Installation allowed at Opt.1, Opt.2, Opt.3
Protocol Modbus RTU
Type of bus RS-485, up to 57.6 Kbps
Isolation 1000 Vdc
Type of terminal plug-in screw terminal, pitch 5.08 mm
Installation allowed at Opt.1, Opt.2, Opt.3
The RTU module provides 1 isolated RS-485 Modbus RTU out -
put, to install on Series M meters.
The module implements function 4
(Read Input Registers)
of
the Modbus RTU protocol, to access the instrument registers
(display values, alarm status, memory of maximum and mini -
mum, etc).
Configuration from the front key pad, through the ‘Opt.1’,
‘Opt.2’ or ‘Opt.3’ menu entries, depending on the slot where
the module is installed.
The RTU modules can be supplied already installed into a Se -
ries M panel meter or as a standalone module. The installa -
tion requires no soldering or special configuration.
2.5 Module RTU
For additional information:
http://fema.es/docs/4254_SERIES_M-K-S_OPTIONS_manual_en.pdf
For additional information:
http://fema.es/docs/4254_SERIES_M-K-S_OPTIONS_manual_en.pdf
Figure 22 - Detail of the Modbus ‘RTU’ communications module
Power
Opt.2 Opt.1
Op
t.3
B A G
B A G
Signal
B A G
B Signal B (bus RS-485)
A Signal A (bus RS-485)
G GND
Figure 23 - Connections for Modbus ‘RTU’ output
Figure 24 - Detail of the ‘S4 ’RS-485 communications module
Power
Opt.2 Opt.1
Op
t.3
B A G
B A G
Signal
B A G
B Signal B (bus RS-485)
A Signal A (bus RS-485)
G GND
Figure 25 - Connections for RS-485 ‘S4’ output
2.6 Module S4
The S4 module provides 1 isolated RS-485 ASCII output, to in-
stall on Series M meters.
The protocol implements a MASTER / SLAVE architecture, ad -
dressable with up to 31 slave modules. The slave mode allows
access to the instrument registers (display values, alarm sta -
tus, memory of maximum and minimum, etc).
It allows to repeat the reading to remote large format meters
from series B (model Bxx-485, with 60mm and 100mm digit
height),
Configuration from the front key pad, through the ‘Opt.1’,
‘Opt.2’ or ‘Opt.3’ menu entries, depending on the slot where
the module is installed.
The S4 modules can be supplied already installed into a Series
M panel meter or as a standalone module. The installation
requires no soldering or special configuration.