Apex Data Sheet
6 892-00000-000-05-201302
Instruction Set
Command Syntax
The list of the commands is shown in the following table followed by a detailed description of each
command. The length of the data depends on the command. All commands are sent to the Maya
through End Point 1 Out (EP1). All spectra data is acquired through End Point 2 In and all other
queries are retrieved through End Point 1 In (EP1). The endpoints enabled and their order is:
Pipe # Description Type
Hi Speed
Size (Bytes)
Full Speed
Size (Bytes)
Endpoint
Address
0 End Point 1 Out Bulk 64 64 0x01
1 End Point 2 In Bulk 512 64 0x82
2 End Point 6 In Unused Unused Unused Unused
3 End Point 1 In Bulk 64 64 0x81
USB Command Summary
EP1 Command
Byte Value
Description
Version
0x01 Initialize Apex 1.01.0
0x02 Set Integration Time 1.01.0
0x05 Query Information 1.01.0
0x06 Write Information 1.01.0
0x09 Request Spectra 1.01.0
0x6A Write Register Information 1.01.0
0x6B Read Register Information 1.01.0
0x6D Read Irradiance Calibration Factors 1.01.0
0x6E Write Irradiance Calibration Factors 1.01.0
0xFE Query Information 1.01.0
USB Command Descriptions
A detailed description of all Apex commands follows. While all commands are sent to EP1 over the
USB port, the byte sequence is command dependent. The general format is the first byte is the
command value and the additional bytes are command specific values.
