44
SI-INTERBUS User Guide
Issue Number: 1
Telegram 5
The fifth telegram from the Interbus master controller has the stamp number set to 5
and contains the mid-low data byte for the parameter being written to.
This telegram is not required for 16-bit parameter access.
Request
Data word = 0x15EA
Stamp Number = 5
Data byte = 0xEA = 234
When the fifth telegram has been received and processed in the slave node, the slave
will mirror the stamp number in the non-cyclic IN word and load the mid-low byte of the
parameter value into the data byte to be transmitted back to the Interbus master
controller. This is the signal to the master controller program that the fifth telegram of
the message has been received and understood, the sixth and final telegram can now
be transmitted.
Response
Data word = 0x15EA
Stamp Number = 5
Data mid-low byte = 0xEA = 234
Telegram 6
The sixth telegram from the Interbus master controller has the stamp number set to 6
and contains the low data byte for the parameter being written to.
This telegram is not required for 16-bit parameter access.
Request
Data word = 0x1663
Stamp Number = 6
Data byte = 0x63 = 99
When the sixth telegram has been received and processed in the slave node, the slave
will mirror the stamp number in the non-cyclic IN word and load the low byte of the
parameter value into the data byte to be transmitted back to the Interbus master
controller. This is the signal to the master controller program that the sixth telegram of
the message has been received and understood, the internal non-cyclic state machine
should now be reset.
Response (success)
Data word = 0x1663
Stamp Number = 6
Data byte = 0x63 = 99
Bit
b15 to b12
b11 to b8
b7 to b4
b3 to b0
Value
0001
0101
1110
1010
Bit
b15 to b12
b11 to b8
b7 to b4
b3 to b0
Value
0001
0101
1110
1010
Bit
b15 to b12
b11 to b8
b7 to b4
b3 to b0
Value
0001
0110
0110
0011
Bit
b15 to b12
b11 to b8
b7 to b4
b3 to b0
Value
0001
0110
0110
0011