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3.2. RS485 Modbus Slave
T
o use the S4AI module as a MODBUS SLAVE device on RS485 inter
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face, the device must be configured as follows:
• Set the device address (register 4004), baud rate (register 4005),
transmission mode (register 4006), upgrade the parameters (regi
-
ster 4007), and save the parameters in non-volatile memory (regi
-
ster 4036)
• Set the input type (registers 4000..4003) and, if required, set the
following: the alarms (registers 4009.. 4018 and 6000..6006),
manual compensation (registers 4019..4022) and set the com
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pensation value (registers 6040..6046), individual characteristic
(registers 4023..4026 and 6008..6038), delete the minimum and
maximum values ( register 4032), clear the timers (register 4033)
and set thresholds for timers (registers 6048..6062), virtual chan
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nels (registers 4043..4054). Save the configuration to non-volatile
memory (register 4036).
• The measured values, the calculated values in the virtual channels,
minimum and maximum values, and the contents of the timers can
be read from the registers 6600..6726.
•
In the case when the range on one or more inputs is exceeded, the
LED indicator ON / ERROR will light alternately in red and green,
and the appropriate error value, according to the table shown be
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low in this manual, will be set in the status register (register 4037).
3. OPERATION
3.1. Configuration
S4AI module can be configured via MODBUS protocol on two interfaces:
• USB: the device responds to any address and requires no power
supply (USB power).
• If the module is powered only by USB, the analog inputs are swit
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ched off, the RS485 interface is inactive and the LED indicator ON
/ ERROR lights continuously red.
RS485: the interface must be configured (registers 4004..4007) and the
device must be powered on.