IPC/COMPACT4-XS: user documentation
DOC/COMPACT4-XSE; V1.2
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3.3.
IPC/COMPACT4-1G(E)
3.3.1. CPU Configuration
For detailed information on how to configure the CPU peripherals please consult the
documentation of the CPU board [2] , chapter 1.4.4.
3.3.2. Serial Interface Configuration
The RS422/485 interface has to be configured according to the customers application. Please
refer to the IPC/COMPAGP-1G documentation [1] , chapter 1.4.4, for a detailed configuration.
Please note that not all options described in the aforementioned document can be used. There
are some restrictions coming from the CPU/Chipset. The following table gives a list of the
options allowed. Otherwise a correct operation cannot be guaranteed.
Description
Allowable Options
Switch/Jumper
Remarks
I/O Base Address
2F8h (COM2)
-
Fixed
Interrupt
3 (COM2)
-
Fixed
Duplex
half/full
S301-1..4
Termination
120E/100E/none
S301-5/6
Pullup/down
470E/none
S301-7/6
Tab. 3 Allowable configuration options RS422/485 interface
Important Notes
•
The current version of the IPC/COMPACT4-1G(E) does not support Echo
Cancellation. Every character sent out will immediately show up in the receive buffer
and must be removed by the application.
•
The current version of the IPC/COMPACT4-1G(E) does not support automatic driver
enable control for the transmitter, instead the driver enable is controlled by the RTS
signal under application software control.
In case of full duplex operation, RTS should be activated to enable the transmitter
constantly. In case of half duplex operation, application software must enable the
transmitter before sending characters and disable the transmitter after the last character
has been sent. A small delay has to be added before disabling the transmitter because
of the time needed to put the last character serialized out to the line (depending on
baud rate setting).
