Fema B Series, User Manual, Page: 33 / 36

FEMA ELECTRÓNICA . SERIES B . Models Bxx-RTU
33
2.7 Module S2
Protocol ASCII
Bus RS-232, 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 S2 module provides an isolated RS-232 ASCII communi -
cations port, to install in large format industrial meters from
Series B.
The S2 module implements a MASTER / SLAVE protocol, with
up to 31 addressable slaves, with ‘daisy-chain’ connection.
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 S2 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.
Figure 23 - Communications module Module ‘S2’
Tx2
Tx1
Rx1 Rx2
D C B A
GND
E
Module S2
A ‘Daisy chain’ Tx data transmission
B ‘Daisy chain’ Rx data reception
C Tx data transmission
D Rx data reception
E GND
Figure 24 - Connections for RS-232 ‘S2’ communications module
For more information:
http://fema.es/docs/4326_SERIES-B_OPTIONS_manual_en.pdf