Thermo Scientific Micro-Tech 9101, Reference Manual

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C-4 Micro-Tech 9101/9201 Reference Manual, Rev J Thermo Fisher Scientific
The communication protocol allows a remote intelligent device to read and
eventually write information from and to the Micro-Tech. For convenience,
the information is organized in a set of registers, which are listed in this
appendix.
During the communication activity, the Micro-Tech always acts as Slave,
meaning it responds to a request from a Master device on the line, but
never attempts to send messages out. The following rules apply.

The Micro-Tech responds only if the message is completely received.

The Micro-Tech reads the message and looks for the address, which is
contained into an address byte in the query package. The message is
then processed only if the address matches the one specified in the set-
up data of the Micro-Tech, otherwise it is ignored.

When the system receives a message, the integrity of the message is
checked. An answer-back message is prepared, if the message is
formally correct.

When a message containing a variable to be written in memory is
received, the system checks the correctness of the message and, if it is
correct, immediately sends the answer-back message. This does not
always mean the data is written in memory. The system first checks the
register number (which must correspond to a valid address of a
variable), then the minimum and maximum limits, and then the
password. If data can be accepted, it is stored in memory and the
success flag is set to 0 (no error). If not, it is set to 1. To know if the last
variables sent have been stored, the Master checks (reads) the success
flag contained in a read-only register.
Protocol
Rules