INFICON STM-2 USB Thin Film Rate/Thickness Monitor - Manual (Page 73)

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STM-2 Operating Manual
5.2.1.2 Command Packet Format
<STX><ADDR><CMD_RSP>[<DATA>...]<CKSUM1><CKSUM2><CR>
Where <CMD> is:
1 BOOT_API Prefix for commands exclusively used to
communicate with a sandal-loader/bootloader
parser running on a target platform.
Non-bootloader applications will consider this
to be invalid (Err_Inv_Cmd). Bootloader parser
agent will initially only respond to this
command prefix, and will be unresponsive
(return no reply) to any others. Once accessed
through this API, bootloader parser can be
commanded to open up to other CMD code
values.
2 Reserved Reserved for future use in protocol stack.
3 Prod_id Product identifier, returned as decimal string.
NOTE: The value for STM-2 is 19 decimal.
4 Version Request slave to return software version string.
5 Reset Request slave to reset/reboot.
6 AckPF Request slave to acknowledge power failure
flag and clear RSPF bit.
7 PROTV Request slave to return protocol stack version
as decimal string.
8 Product_Specific Application API prefix to precede STM-2
commands (see
section 5.3 on page 5-8 ).
NOTE: SMDP will respond to commands in the range of 1 through 7. Commands
2 through 7 are handled in the protocol, at the protocol layer. Applications
are not to use commands 2 through 7 except to implement the protocol
specification.