2070LX Controller – User Manual 35
Version 1.0
LINESYNC:
Once the LINESYNC is isolated it is inverted again, then the inverted and not-inverted signals go
to the processor.
It is converted to EIA-485 differential signals and routed to the C12S connector.
POWERDOWN:
It is converted to EIA-485 differential signals and routed to the C12S connector.
SP-3 and SP-5 Serial ports
SP-5
The module receives the SP-5 transmission signals (TxD and TxC) through the A3 connector; they are
converted from EIA-485 signals to single ended signal, inverted and converted to multidrop isolated ports,
then one is routed to the processor and the other one is converted to EIA-485 signals again then routed
to the C12S connector mounted on the front plate.
The SP-5 reception signals (RxD and RxC) come from the C12S connector; they are converted from EIA-
485 signals to single ended signal, opto-isolated, converted to differential signals and then routed to the
A3 connector.
Field SP-5 enable signal (FSP5_EN): This signal disables the EIA485 line driver for the SP-5 reception
signals (RxD and RxC) that come from the C12S connector and at the same time it enables the SP-5
reception signals (RxD and RxC) from the processor’s communication port in order to send them to the
A3 connector.
SP-3
The module receives the SP-3 transmission signals (TxD and TxC) through the A3 connector; they are
converted from EIA-485 signals to single ended signal, inverted, isolated, converted to EIA-485 signals
again then routed to the C12S front connector.
The SP-3 reception signals (RxD and RxC) come from the C12S connector; they are converted from EIA-
485 signals to single ended signal, opto-isolated, converted to differential signals and then routed to the
A3 connector.
SP-3 enable switch (S1):
The “S1” toggle switch located on the main board connect/disconnect the transmission and
reception of the SP-3 serial port in the Field I/O module in order to prevent a multiple use.
The switch enables/disables the EIA-485 line driver and receiver that handle this serial port by
forcing the enable input to ground.
Switch at “ON” position, SP-3 is available at C12S connector, “SP3 ACTIVE” LED is turned on.
Switch at “OFF” position, SP-3 is NOT available at C12S connector, “SP-3 ACTIVE” LED is
turned off.
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