Q12 The BSC protocol is used by a master device to communicate with a slave device (station no. 4). a) The master selects the device, in order to ascertain whether it can send data to the device. Give the select command sent by the master in ASCII as well as hex. Write down the transmission in the format SYN>SYN> etc. for ASCIl and 55>10> etc. for hex. No need to show the PAD>. ( 4 marks) b) The device indicates that it is ready to accept data, and the master now sends the following data: 1234 (ASCII). Write down the master's: transmission (frame) in ASCII as well as hex. No need to show the PAD>. Make up your own BCC (checksum). (4 marks) c) How is data transparency achieved in DF -1? (2 marks) A12 Student answer Q13 a) A MODBUS RTU master interrogates slave 3 in order to read the status of (10 marks) (only) coils 5, 6, 7 and 8 (physical). Assume that all four coils are set. Write down the request and response messages in hex. b) Show what the same messages would look like in MODBUS ASCII. Note - This question is mandatory. It should be answered and students are expected to obtain at least 8/10 to be assessed as competent with a score for this module. A13 Student