STM8SPLNB1 datasheet(41/44 Pages) STMICROELECTRONICS

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STM8SPLNB1

DiSEqC™ protocol basics

For more detailed information about DiSEqC™ protocol - see DiSEqC™ bus functional

specifications and DiSEqC™ slave microcontroller specifications. Refer to

www.eutelsat.com.

A.2

Protocol layer

The DiSEqC™ messages are transferred in packets. One packet consists from several

bytes - each byte has 8 bits followed by parity bit (odd).

The full DiSEqC™ message contains a frame byte, an address byte, a command byte which

can be followed by several data bytes.

Figure 22. DiSEqC™ message format

When host is requesting an answer from the slave (microcontroller) then the answer

consists from frame byte which can be followed by several data bytes

Figure 23. Microcontroller answer format.

The frame byte identifies the direction, reply requirements and error status - see following

Table 35.

The address byte identifies the receiver. There also exist address groups (families). The

family address is valid for all devices with similar (family) function - all given family devices

receive message. Address families are described in DiSEqC™ slave microcontroller

specifications. Universal (broadcast) address is 0x00 - all devices should receive messages

with this address.

Command byte describes given command for device - according this command the device

selects method for data processing.

Table 35. DiSEqC™ frame byte definition

Frame byte

definition

0xE0

Command from master, no reply required, first transmission

0xE1

Command from master, no reply required, repeated transmission

0xE2

Command from master, reply required, first transmission

0xE3

Command from master, reply required, repeated transmission

0xE4

Reply from slave, OK, no errors found

0xE5

Reply from slave, command not supported

0xE6

Reply from slave, parity error, repeat requested

0xE7

Reply from slave, command not recognized, repeat necessary

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