ABB YPQ201A YT204001-KA DC output module

For main bi-directional communication, the DMC-18x2 features a 512 character write FIFO buffer, and a 512 character read buffer. This permits sending commands at high speeds ahead of their actual processing by the DMC-18x2. Note: This chapter provides an in-depth look at how the controller communicates over the PCI bus at the register interface level. For most users, we recommend using the drivers supplied by Galil to provide the necessary tools for communicating with the controller. Determining the Base Address The base address “N” is assigned its value by the BIOS and/or Operating System. The FIFO address N is referenced in the PCI configuration space at BAR2 (offset 18H).

Communication Registers

 The DMC-18x2 provides three registers used for communication. The READ register and WRITE register occupy address N and the CONTROL register occupies address N+1 in the I/O space. The READ register is used for receiving data from the DMC-18x2. The WRITE register is used to send data to the DMC-18x2. The CONTROL register may be read or written to and is used for controlling communication, flags and interrupts.To receive data from the DMC-18x2, read the control register at address N+1 and check bit 5. If bit 5 is zero, the DMC-18x2 has data to be read in the READ register at address N. Bit 5 must be checked for every character read and should be read until it signifies empty. Reading data from the READ register when the register is empty will result in reading an FF hex.

Write Procedure 

To send data to the DMC-18x2, read the control register at address N+1 and check bit 6. If bit 6 is zero, the DMC-18x2 FIFO buffer is not almost full and up to 16 characters may be written to the WRITE register at address N. If bit 6 is one, the buffer is almost full and no additional data should be sent. The size of the buffer may be changed (see "Changing Full Flags" below). Any high-level computer language such as C, Basic, Pascal or Assembly may be used to communicate with the DMC-18x2 as long as the READ/WRITE procedure is followed as described above. Example software drivers are contained on the COM-DISK from Galil.

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