MT3896E Rev.1
15/10/2019
Pagina 11 di 45
Dip-switch 1: Baud Rate Bus RS485
Positione
Velocità comunicazione bus
Detector and Module compatibility
ON
115.200
Smart “S” gas detectors and ST.G/IN8-S /
ST.G/OUT16-S modules
OFF
9.600
Smart “3G” gas detectors and ST.G/IN8-S /
ST.G/OUT16-S modules
Dip-switches 2 and 3: RS485 bus communications protocol
Sw 2
Sw 3
Protocollo
Compatibilità Rilevatori e
Moduli
Note
ON
ON
Galileo
Smart “S” gas detectors and
ST.G/IN8-S / ST.G/OUT16-S
modules
Baud Rate 115.200
OFF
ON
IDI
Old SMART IDI, SMART3 CC and
CD detectors. Old STG/IN8 and
STG/OUT16 modules. STG/IN8-N
and STG/OUT-16-N modules
Baud rate 9600
ON
OFF
Modbus
SMART3G gas detectors;
STG/IN8-S and STG/OUT16-S
modules
Baud rate 9600
(if SMART3G detectors are
not connected to the bus,
115.200 Bps can be set
(switch 1))
OFF
OFF
Configurazione non usata
Dip-switch 4 and 5: Communication (baud rate) of the RS232 serial port for the
communication with the PC
Sw 4
Sw 5
Baud Rate
ON
ON
9600 Bit/sec.
OFF
ON
19200 Bit/sec.
ON
OFF
38400 Bit/sec.
OFF
OFF
115200 Bit/sec. (default)
Dip-switches 6 and 7: not used
Dip-switch 8: restore default settings
Position
Function
ON
When turned on, restores unit default settings
OFF
Normal position
2.2)
Field device connections
The unit has 2 RS485 data buses connected to field gas detectors. The 2 serial buses can be
used in "open" mode or "closed" (1 loop). The choice is set during programming with the PC
software.
On the serial lines it is possible to connect the gas detectors (these can be daisy chained on the
bus, if detectors are equipped with the RS485 interface, or via remote 8-input modules
STG/IN8-S with 4-20 mA transmission type) and the output modules STG/OUT16-S.
The length of each serial line is maximum 1000 mt.
