EN
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•
RS-485 port 1 and port 2: must be configured
(Table 4: 4000 Modbus registers - see full version of service
manual) and the device must be powered.
3.2. Slave operations
In order to use the S4AO module as a Slave device on a RS-485
interface, it has to be configured as follow:
•
RS-485 port 1 mode (register 4010). (or RS-485 port 2
mode (register 4017)) set to ‚0’ (Slave), set transmission
mode, baudrate address and update changes (register
4016 for port 1, 4023 for port 2),
•
The outputs values have to be multiplied by 100 and written
on 4100 to 4103 registers. For example, to get 5,00 V on
a voltage output, write “500” on the corresponding register,
•
Note that on start, each output is set to its alarm value (re
-
gister 4112 to 4115),
•
Eventually, set the high and low value threshold to start
the high and low value counters (registers 4104 to 4111),
and reset them (registers 4162 to 4170).
3. OPERATION
3.1. Configuration
The S4AO module can be configured by Modbus protocol
through 3 interfaces:
•
USB: the device will reply to all address and does not re
-
quires power supply. If only USB is plugged without power
supply, the analog outputs will stay to 0, the RS-485 interfa
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ces will not be available and the POWER / ERROR led will
light continuously in red. This interface is dedicated to confi
-
guration and should be unplugged during normal operation.
Summary of Contents for S4AO
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