PNI CommBoard User Manual
Page 13
PNI Sensor Corporation
DOC#1018122 r02
PNI CommBoard User Manual
Page 11
for the MSB and “21” for the LSB. In summary, the following is sent after the
complete Write command is executed (in decimal notation): 123 ,200 ,3 ,21.
Example:
Wi1,n1
The command will send the number “1” twice, once as a 16-bit word and next as
an 8-bit word. The send bytes will look like 00,01,01.
R or r
– SPI Read
This character initiates a Read operation. The syntax is:
R{#n}{S}(NIML){{#n}{S}(NIML).....}{
Example: Rni
This command will read an 8–bit word and then a 16-bit word.
Note the word length character (NIML) must be sent for a Read operation, although
it is optional for a Write operation. A delimiter can be inserted at any point to change
the delimiter used for the data returned to the host.
Note the Read command supports a Write-Simultaneous-With-Read operation. In
this case only 8-bit words are supported. Hence {#n} in the syntax. See Section
5.2.1 for an example.
, ,
– Delimiters
Anytime a delimiter character is sent it will set the delimiter character used for
separating data in the output after a Read command sequence. Once the delimiter is
set, it will be retained until a subsequent command changes the delimiter.
Unlike other delimiters, a
the command character again to use the command again.
delimiter for subsequent data; rather, the prior delimiter will be retained.
Terminating a Read command with a
command, will cause a
Matlab to read the incoming values you will want to terminate with a
is compatible with the fscanf() function.
X or x
– Hex/Decimal Mode
Sets the protocol to hexadecimal or decimal. “X” sets the protocol to hexadecimal,
while “x” sets it to decimal. Once the protocol is set, it will be retained until a
subsequent command changes the protocol. On power-up, the default is “X”. Also,
when hexadecimal mode is selected, hexadecimal digits “a” through “f” must be
lower case.