Emerson PACSystems RX3i - Page 5

Contents
Contents iii
4.5.2 STOP-to-RUN Mode Transition .......................................................................................... 91
4.6 Flash Memory Operation ..................................................................................................... 92
4.6.1 RUN/STOP Switch Operation ............................................................................................ 93
4.7 Logic/Configuration Source and CPU Operating Mode at Power-Up ....................................... 93
4.7.1 CPU Mode when Memory Not Preserved/Power-up Source is Flash ................................... 95
4.7.2 CPU Mode when Memory Preserved ................................................................................. 96
4.8 Clocks and Timers .............................................................................................................. 97
4.8.1 Elapsed Time Clock ........................................................................................................... 97
4.8.2 Time-of-Day Clock ............................................................................................................ 97
4.8.3 Watchdog Timer ............................................................................................................... 98
4.9 System Security ............................................................................................................... 100
4.9.1 Passwords and Privilege Levels - Legacy Mode ................................................................. 100
4.9.2 OEM Protection – Legacy Mode ...................................................................................... 104
4.9.3 Enhanced Security for Passwords and OEM Protection .................................................... 105
4.9.4 Legacy/Enhanced Security Comparison .......................................................................... 107
4.10 PACSystems I/O System .................................................................................................... 108
4.10.1 I/O Configuration ........................................................................................................... 109
4.10.2 I/O System Diagnostic Data Collection ........................................................................... 111
4.10.3 Power-Up and Power-Down Sequences ......................................................................... 112
Section 5: Communications .............................................................................................................. 119
5.1 Ethernet Communications ................................................................................................ 119
5.1.1 Embedded Ethernet Interfaces........................................................................................ 119
5.1.2 Ethernet Interface Modules ............................................................................................. 124
5.2 Serial Communications ..................................................................................................... 124
5.2.1 Serial Port Communications Capabilities ......................................................................... 125
5.2.2 Configurable STOP Mode Protocols ................................................................................ 126
5.2.3 Serial Port Pin Assignments ............................................................................................. 126
5.2.4 Serial Port Electrical Isolation .......................................................................................... 130
5.2.5 Serial Cable Lengths and Shielding .................................................................................. 131
5.2.6 Serial Port Baud Rates ..................................................................................................... 131
5.2.7 Communications Coprocessor Module (CMM) ................................................................ 132
5.2.8 Programmable Coprocessor Module (PCM) .................................................................... 132