Jumpers And Dip Switch; Opening The Matrix; Rs485 Load Jumpers On The Aux Lines; Dip Switch - Videotec SM328A Manuel D'instructions

2.3

Jumpers and DIP switch

2.3.1

Opening the matrix

Inside the matrix there are two jumpers (JP1 and JP2, behind the Aux connectors) for inserting the RS485
load, one DIP switch (SW1, near the backup battery in the centre of the board) and a backup battery:
Warning! The operations described below are carried out with the matrix cover removed. Take
great care to prevent the risk of electric shock.
2.3.2

RS485 load Jumpers on the Aux lines

To comply with the standard, the RS485 communication lines must be terminated at the ends to prevent
signal reflection.
On the Aux A and Aux B auxiliary communication lines the load can be inserted (jumper in the LOAD
position) or excluded (jumper in the NOLOAD position).
JPA is the jumper on the Aux A line, JPB is the jumper on the Aux B line.
2.3.3

DIP switch

To prevent faulty operation of the system, do not make DIP switch settings that are not included
in the following tables.
2.3.3.1 Protocol and baud rate
1 2 3
off off off
off off
ON
off ON off
ON ON off
•
2. System installation
DIP switch
4 5 6 7
off - - -
off - - -
off - - -
off - - -
8 Protocol
- Macro
- Macro
- Macro
- Macro
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Baud rate
38400
19200
9600
1200
MNVCSM328A_1511_EN
Notes
default