Page 347 - The ROV Manual - A User Guide for Remotely Operated Vehicles 2nd edition

13.2 Transmission 339
Subsea Sonar Head
“Hello surface software.”
“I have some data for you. Here it is.”
“No.” “Bye.”
Subsea Sonar Head
“Hello surface software. Here is some data.”
“I have some data for you. Here it is.”
“No.” “Bye.”
(a)
Surface Software
“Hello subsea sonar. Do you have some data for me?”
“Any more data?” “Bye.”
Surface Software
“Hello subsea sonar. I have received your data.”
“I have received your data. Any more data?”
“Bye.”
FIGURE 13.10
(b)
Synchronous versus asynchronous transmission: (a) depicts synchronous transfer and (b) displays asynchronous transfer.
FIGURE 13.11
Generic data frame FAC F
Data/text
FCS
8-Bit flag pattern (trail) 16-Bit frame check
Text of varying length 8-Bit control field
8-Bit address field 8-Bit flag pattern (lead)
A generic data frame. Flag pattern 5 unique field. Data/text is the information.
13.2.3 Line characteristics
Next, we consider the actual transmission data pipeline in order to determine the strengths and weaknesses of each transmission method.