CiDRA Passive Sonar Transmitters - Manual (Page 6)

1.2 CONFIGURATION SETTINGS
1.2.1 Transmission Modes
•
RTU (Default)
•
ASCII
1.2.1.1 RTU
In RTU (Remote Terminal Unit) mode, each 8–bit byte in a message
contains two 4–bit hexadecimal characters. The main advantage of
this mode is that its greater character density allows higher data
throughput than ASCII mode for the same baud rate. Each message
must be transmitted in a continuous stream of characters.
The default parity mode in the transmitter is EVEN parity.
1.2.1.2 ASCII
In ASCII (American Standard Code for Information Interchange)
mode, each 8–bit byte in a message is sent as two ASCII characters.
This mode is used when the physical communication link or the
capabilities of the device do not allow conformance with RTU mode
requirements.
Note: This mode is less efficient than RTU since each byte needs two
characters.
Example:
The byte 0X5B is encoded as two characters: 0x35 and 0x42
(0x35 ="5" and 0x42 ="B" in ASCII).
Even parity and no parity also are supported. The default parity mode
in the transmitter is EVEN parity.
20959-01 Rev 02 Page 1-3