Comtech EF Data CST-5005 - Manual (Page 73)

CST-5005 C-Band Satellite Terminal Theory of Operation
Rev. 1 5–3
5.1.1 EEPROM Memory
EEPROM memory on the M&C module allows it to retain configuration information
without prime power for at least one year. If the terminal has been powered down, the
following power-up sequence will be carried out by the M&C microcontroller when
power is reapplied:
1. The microcontroller checks the EEPROM’s Random Access Memory (RAM) to
see if valid data has been retained. If valid data has been retained, the terminal is
reconfigured to the configuration maintained in EEPROM.
2. If EEPROM memory fails the valid data test, a default configuration from Read
Only Memory (ROM) is loaded into the system.
5.1.2 Remote Interface
The functions of the RFT-505 can be remotely controlled and monitored via an RS-485
or RS 232-C communications link. The M&C module must be hardware configured to
one of the two interfaces.
The RS-485 interface makes it possible to operate 255 terminals on a common
communications link.
The RS-232-C interface is used to communicate with a single terminal.
Refer to Figure 5-2 for the jumper placement at JP3.
Figure 5-2. M&C Jumper Placement at JP3