Siemens AC75 Example Transfer and Response Messages on SPI, + 11 22 33 44 ... FF, + Aa Bb Cc Dd

AC75 AT Command Set

19.8 AT^SSPI

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19.8.6Example: Transfer and Response Messages on SPI

The following examples shall illustrate the message structure and write/read procedures explained in Section 19.8.3.2, Structure of Messages on the SPI. Blanks are inserted only to better visualize frame elements. In prac- tice no blanks are allowed.

<0 00 0000 11 22 33>	Transfer Message: The master writes 3 bytes.
{0 +}	Response Message: Transmission successful.
<1 00 0010>	Transfer Message: The master requests to read 16
	bytes from the slave. Read Offset is zero, therefore,
	reading starts from the first byte.
{1 + 11 22 33 44 ... FF 00}	Response Message: Reading data successful.
<2 03 0008>	Transfer Message: The master requests to read 8
	bytes from the slave. Read Offset is 3, therefore,
	reading starts from the fourth byte.
{2 + 44 55 66 77 88 99 AA BB}	Response Message: Reading data successful.
<3 03 0004 11 22 33 44 55 66>	Transfer Message: The master writes 6 bytes and
	requests to read 4 bytes from the slave. Read Offset
	is 3, therefore, reading starts from the fourth byte.
{3 + AA BB CC DD}	Response Message: Reading and writing data suc-
	cessful.

AC75_ATC_V01.002	Page 505 of 569	10/30/06
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