DLP-245SX DLP Design Inc, DLP-245SX Datasheet - Page 6

• Manufacturer Part Number: DLP-245SX
• Description: Interface Modules & Development Tools USB/Micro Dev Board
• Manufacturer: DLP Design Inc

Specifications of DLP-245SX

• Interface Type: USB
• Data Bus Width: 8 bit
• Operating Supply Voltage: 5.25 V
• Product: Interface Modules
• For Use With/related Products: SX28
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

the drivers (Ftdiunin.exe for VCP and Ftd2xxun.exe for DLL). These uninstall programs are
included with the driver files.
TOKEN I/O
The SX28 microcontroller on the DLP-245SX is shipped from the factory preprogrammed with
firmware that provides rudimentary access to the port pins via either the VCP or DLL drivers.
Features include the ability to read and write individual port pins as well as 8-bit port reads and
writes.
The firmware in the DLP-245SX also provides access to the on-board EEPROM memory, and
communications with digital temperature-sensing devices.
Commands sent to the Token I/O firmware must adhere to a specific communications protocol.
Each command sequence contains the following information:
The checksum is computed by exclusive-OR-ing every byte in the string. If the same checksum
is calculated by the SX28 upon receipt of the packet, then a single-byte reply of 0x55 is returned
to the host. In the event of a checksum error, the SX28 will return an error code of 0xAA. For
example, setting port PIN_A1 high would require the following string of bytes:
0x03, 0xA6, 0x29, 0x01, 0x8D
Definition of the Bytes:
0x03 – Number of bytes in command (checksum excluded)
0xA6 – Command for set port pin high/low
0xA1 – Affected port pin
0x01 – Desired state of port pin
0x8D – Checksum of previous 4 bytes
Byte 0:
Byte 1:
Byte 2…n-1:
Byte n:
Number of bytes in command sequence
Command
Parameter/Data bytes
Checksum
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