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IS-Dev Kit-8 User’s Manual
7850 East Gelding Drive ? Scottsdale, AZ 85260-3420
6. Communication Protocol
Communication initiated by Host
The controller communicates with the host via RS232 serial communication (57.6K, 1 start bit, 8 bit, 1 stop
bit). The controller receives the data via an interrupt routine that places the data on the circular receive buffer.
When the controller detects data in the circular receive buffer, the controller reads one byte and executes the
following:
A. If the byte is a command, the controller transmits a 61H and executes the subroutine for the command
and upon completion of command the controller transmits 79H.
B. If the byte is not a command, it is ignored.
When the controller executes a subroutine and expects additional information:
A. A timer is set. If the expected data byte is not received in 64ms, the controller transmits 6CH 6EH and
terminates the routine.
B. If the byte value is not acceptable (invalid range, option, etc.), the controller transmits 6EH and
terminates the routine.
Commands are one byte in the range of 20H to 2FH and 01H and are transmitted in hex format. The proper
format for all command options and data is specified for each command. See Section 7.
Communication initiated by the IS-Dev Kit-8
The Dev Kit transmits codes to host via RS232 based on activities stated below. Many of these reporting can
be enable/disabled by the flag setup.
A.
B.
C.
D.
E.
F.
G.
H.
Top switch press is reported as 91H
Top switch Release is reported as C1H
Middle switch press is reported as 92H
Middle switch Release is reported as C2H
Bottom switch press is reported as 93H
Bottom switch Release is reported as C3H
Timer Expire is reported as 94H
Upon changing the image, the image address is reported as FCH followed by the address in HEX so
total of 3 bytes transmitted for each image change.
I. If there is a communication problem between microcontroller and the microSD flash, the controller
will transmit 6FH to host for each communication failure.
IS-Dev Kit 8 Users Manual D.doc
Toll Free 1.877.2BUYNKK (877.228.9655) ? Phone 480.991.0942 ? Fax 480.998.1435
www.nkkswitches.com ? Email engineering@nkkswitches.com
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