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3. Settings
There is a bank of 8 DIP switches on the Procon A1M PCB labelled as 'CONFIGURATION'. These switches are used
to configure the Modbus Slave ID and the RS-485 baud rate.
3.1. Modbus Slave ID
Any Modbus Slave ID in the range 1 – 31 can be chosen using switches 1 – 5. The address is set in binary, where the
switch positions have the following values:
Switch number
Value when switch is set to ON
1
2
3
4
5
To get the Slave ID, add together the value for each switch set to ON. For example, to set address 13, set switches 1,
3 and 4 ON (1 + 4 + 8 = slave ID 13).
Please note: Each Procon A1M connected to the same RS-485 network must be set to a unique address.
3.2. Baud rate
The baud rate can be set to values from 1200 up to 115200 baud using DIP switches 6 – 8 as follows:
Baud rate
Switch 6
1200
OFF
2400
ON
4800
OFF
9600
ON
19200
OFF
38400
ON
57600
OFF
115200
ON
3.3. Other communication settings
All other communication settings are fixed:
-
8 Data Bits
-
No Parity
-
1 Stop Bit
3.4. RS-485 termination
RS-485 termination resistors can also be enabled on the A1M PCB using a single jumper. These settings are
summarised below:
Jumper Setting
Not connected
LK1
LK2
LK3
1
2
4
8
16
Switch 7
Switch 8
OFF
OFF
OFF
OFF
ON
OFF
ON
OFF
OFF
ON
OFF
ON
ON
ON
ON
ON
Description
No termination or pull-up resistors enabled
Pull-up resistor A enabled
RS-485 termination resistor enabled
Pull-down resistor B enabled
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