McCain FleX M73101R, User Manual, Page: 15 / 142

8
This port uses four (Tx, Rx, TxClk and RxClk) EIA-485 differential serial communications interfaces. The
port has a software selectable speed of 19.2Kbps, 38.4Kbps, 57.6Kbps, 76.8Kbps, 115.2Kbps,
153.6Kbps and 614.4Kbps. The default speed is 614.4Kbps.
2.4.13 Fuse and Switch
There is a fuse holder with a 2 AMP fuse (3AG type) for the AC line located on the front panel which is
easily removed without using any tools. Also there is a rocker switch used to power on and off the
controller unit.
2.4.14 Active LED
This LED is used to indicate the status of the controller as defined for the application running into the
controller.
2.4.15 Aux Switch
When the AUX Switch is toggled, the appropriate AUX Switch code is transmitted to the CPU.
AUX SWITCH CODES
SWITCH POSITION ASCII DATA (TEXT) ASCII DATA (HEX)
ON ESC O T 1B 4F 54
OFF ESC O U 1B 4F 55
Figure 6: Auxiliary Switch codes.
2.5 Internal Construction / Sub-Assemblies:
This section briefly describes the construction and operation of each sub-assembly of the FleX controller,
indicating the interface connectors on each board and the relationship to the other boards.
For a more detailed understanding of a specific module or sub-assembly please refer to the proper
appendices.
Appendix A Contains the assembly drawings.
Appendix B Contains the bills of materials.
2.5.1 Front Panel Module
The sub-assemblies installed onto the front panel are described below:
2.5.1.1 Host Board Sub-Assembly (M58570A).
This sub-assembly supports almost all of the circuitry and physical connections of the communication
interfaces, as the name indicates, it is the host which supports the engine board, so it contains all the
necessary circuitry to receive all communication channels, control lines from the engine board and all the
necessary I/O interfaces to the external world.
Below are briefly described the circuits and interfaces included onto the host board: