Comtech EF Data CSAT-5060 - Manual (Page 54)

C-Band Transceiver Revision 1
Remote Control MN/CSAT5060.IOM
6–2
6.2 Basic Protocol
Whether in RS-232 or RS-485 mode, all data is transmitted half-duplex as asynchronous
serial characters suitable for transmission and reception by a UART. In this case, the
asynchronous character format is fixed at:
• 8 data bits
• No parity
• 1 stop bit
The baud rate may vary between 1200 baud and 19,200 baud.
All data is transmitted in framed packets. The master is assumed to be a PC or ASCII
dumb terminal, which is controlling the process of monitor and control. The master is the
only device that is permitted to initiate the transmission of data. Slaves are only permitted
to transmit when they have been specifically instructed to do so by the master.
All bytes within a packet are printable ASCII characters. In this context, the Carriage
Return and Line Feed characters are considered printable.
All messages from master to slave require a response (with one exception). This will
either be to return data that has been requested by the master, or to acknowledge
reception of an instruction to change the configuration of the slave. The exception to this
is when the master broadcasts a message (such as Set time/date) using Address 0.