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Installation and commissioning
February 2023
Setting RS 485 address
Before operating the RS 485 bus, assign a device address at the range of 1 to 255 to each
monitor (AMS 6300 Configuration software: Monitor → Set communication parameter).
Up to 31 devices can be connected to one RS 485 bus.
Upon delivery, the RS 485 address of all AMS 6300 SIS monitors is set to 255.
RS 485 Bus termination
The operation of the RS 485 bus requires electrical terminations at the first and last device
of the bus. Install a 120 Ω termination resistor between lines A and B at the computer (or
interface converter) and at the (physically) last device of the bus.
Additionally, connect line "A" to +5 V through a pull-up resistor and line "B"" to ground
through a pull-down resistor at one point of the bus. Therefore use the jumpers located on
the board directly beside the terminal strip (see
"off"), the bus lines are open and without termination.
To activate the bus termination and to initiate the references between "A" and +5 V and "B"
and GND, you have to set the jumpers as shown in
jumper position for a deactivated bus termination and open references (delivery state).
Figure 4-15: Jumper settings
A. Deactivated bus termination (delivery state)
B. Activated bus termination
•
1 – 2 closed: Line B to GND through a resistor
•
3 – 4 closed: Line termination resistor 120 Ω between lines A and B
•
5 – 6 closed: Line A to +5 V through a resistor
Figure 4-16
the three monitors. The RS485 bus is interconnected through the backplane.
40
shows an example whereat the jumpers for the bus configuration are open at
Operating Manual
Figure
3-2). With open jumpers (position
Figure 4-15
B).
Figure 4-15
MHM-97442, Rev. 2.06
MHM-97442
A) shows the
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