Comtech EF Data CST-5000 - Manual (Page 92)

CST-5000 C-Band Satellite Terminal Theory of Operation
Rev. 9 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 is powered down, the following
sequence will be carried out by the M&C microcontroller:
1. When power is reapplied, 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-500 can be remotely controlled and monitored via an EIA-485
or EIA-232 communications link. The M&C module must be hardware configured to one
of the two interfaces.
The EIA-485 interface makes it possible to operate 255 terminals on a common
communications link.
The EIA-232 interface is used to communicate with a single terminal.
Refer to Figure 5-2 for the jumper placement at JP3.
EIA-485 EIA-232
16
JP3
15 9
2
1
SHORTING
SHUNT
SHOWN STRAPPED
FOR EIA-485
Figure 5-2. M&C Jumper Placement at JP3