Burkert Type 8056 - Manual (Page 28)

- 28 - RS232_485_ETP_MODBUS_BU_REV02.doc
3.3.13. FLOW CHART FOR SENDING ETP COMMAND AND RECEPTION OF THE ANSWER
Flow chart with description of the sending of an ETP command to a converter through the RS 485 port and wait cycle
for the reception of the answer
START
The MASTER generates ETP command
The MASTER send ETP command to the addressed SLAVE
The MASTER enables the transmitter
The MASTER enable receiver - Start timer
Tlim
Timer
Tlim
expired ?
The MASTER decode the Header answer
Packet with addresses
for other device
Packet deleted
Reset timer
Tlim
The Timer has expired
Answer not received
END
Si
No
Timer char expired ?
Si
No
Has received 4 bytes ?
No
Si
Has it received char ?
Start timer char
No
Si
Reset timer char
Has it received char ?
Si
No