Siemens AC75 - Manual (Page 504)

AC75 AT Command Set
19.8 AT^SSPI
s
AC75_ATC_V01.002 Page 504 of 569 10/30/06
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19.8.5 Example: Using I²C Bus
As stated above, it is recommended to run the Terminal program in chat mode or to use the local echo. First,
activate the I²C interface:
The module is in data mode now. This allows you to send a Write Transfer Message:
To quit data mode and return to command mode enter the Close character "#":
If the ME is in command mode, the response to the read command contains the factory settings.
If the ME is in data mode, the response to the read command contains the current settings.
AT^SSPI=0010,0000,0000,0000,0000
The first group of characters forms the
<basicCon-
figuration>
, where the first "0" sets I²C, the sec-
ond "0" is the internal port, the digit "1" sets 400 kbps
bit rate on the I²C bus, and the next "0" selects ASCII
coding. This is followed by a comma and the value
"0000" = no delay time after Write and Read.
Note: If omitted all above parameters are assumed
by default. Therefore, instead of
AT^SSPI=0010,0000,0000 it is sufficient to enter
only AT^SSPI=
CONNECT
<aAE000102030405060708090A0B0C0D0E0F>
Write Transfer Frame, where a = ID, AE = Slave
Address and write request.
{a+}
Write Response Message, where a = ID.
<bAF0010>
Read Transfer Message, where b = ID, AF = Slave
Address and read request, 0010 = number of
expected bytes.
{b+000102030405060708090A0B0C0D0E0F}
Read Response Message, where b = ID.
#
OK
The response OK confirms that the ME is back to
command mode and ready to accept any AT com-
mands.
AT^SSPI?
AT^SSPI=0,0010,0000,0000
The read command returns the connection state "not
connected" (Channel closed) and the factory set-
tings for I²C.
OK
AT^SSPI?
AT^SSPI=1,0010,0012,00FF,0000,0000
The read command returns the connection state
"connected" (Channel open) and the current settings
for I²C.
OK