Blue Heat/PCI User’s Manual, Connect Tech Inc.
15 Revision 0.11
If this occurs, the driver will signal that a given resource has not been assigned, which requires
the user to assign system resources manually. Remove the assignments for ISA devices with the
BIOS setup and then reboot the computer. After reboot, determine with the BIOS setup utility
what resources have been assigned to the PCI devices and then do manual assignments of free
resources to ISA devices. Reboot your system. If the BIOS cannot find a suitable configuration
please contact Connect Tech Technical Support.
Blue Heat/PCI adapters offer ideal solutions for applications requiring serial communications up
to 57.6 Kbps (Blue Heat/PCI CL models), 921.6 Kbps (Blue Heat/PCI RS-422/485; Opto; Opto
RS-422/485; Universal Blue Heat/PCI RS-422/485 models) or 1382.4 Kbps (Blue Heat/PCI;
RJ-11 models). Their baud rates are software selectable, so therefore please refer to the
Software Installation section for configuring the baud rates under certain operating systems.
RS-422/485 Line Interface The Blue Heat/PCI RS-422/485; Opto; Opto RS-422/485 and Universal Blue Heat/PCI
RS-422/485 adapters come with the RS-422/485 electrical line interface. The RS-422/485
electrical interface is a reliable high-speed serial link that offers superior noise immunity and
multi-drop network connectivity. The RS-422/485 electrical interface is also a superset of the
RS-422 electrical interface. These adapters offer full RS-422/485 support in hardware. The
modes are as follows:
Full Duplex Mode
In this mode, TxD & RxD are active all the time. This mode is typically used in point to point
situations much like RS-232. Please refer to Appendix C: RS-422/485 Line Interface.
Half Duplex Mode
In this mode the TxD line driver is enabled only when data is transmitted and RxD is disabled
when data is being transmitted. This mode is typically used in either point to point "2 wire"
connections OR in multi-drop "2 wire" bus connections. Please refer to Appendix C:
RS-422/485 Line Interface.
Multi-drop Slave Mode
In this mode the TxD line driver is enabled only when data is transmitted and RxD is enabled all
the time. This mode is typically used in multi-drop "4 wire" connections. Please refer to
Appendix C: RS-422/485 Line Interface.
20mA Current Loop Interface
The Blue Heat/PCI CL adapter comes with the 20mA Current Loop electrical line interface. The
20mA Current Loop electrical interface provides a reliable high-speed serial link over a long
distance that offers superior noise immunity and multi-drop network connectivity. Please refer
to Appendix D: 20mA Current Loop Interface.