Contents
GFK-2222AD April 2018 iii
4.5.3 RUN/STOP Switch Operation ...................................................................................................................................... 152
4.6 Flash Memory Operation ................................................................................................. 153
4.7 Logic/Configuration Source and CPU Operating Mode at Power-Up ........................ 154
4.7.1 CPU Mode when Memory Not Preserved/Power-up Source is Flash ....................................................... 155
4.7.2 CPU Mode when Memory Preserved ....................................................................................................................... 156
4.8 Clocks and Timers ............................................................................................................ 157
4.8.1 Elapsed Time Clock .......................................................................................................................................................... 157
4.8.2 Time-of-Day Clock ............................................................................................................................................................ 158
4.8.3 Watchdog Timer ................................................................................................................................................................ 159
4.9 System Security ................................................................................................................ 161
4.9.1 Passwords and Privilege Levels - Legacy Mode .................................................................................................. 162
4.9.2 OEM Protection – Legacy Mode ................................................................................................................................. 164
4.9.3 Enhanced Security for Passwords and OEM Protection ................................................................................. 165
4.9.4 Legacy/Enhanced Security Comparison................................................................................................................. 166
4.10 PACSystems I/O System .................................................................................................. 167
4.10.1 I/O Configuration ............................................................................................................................................................... 168
4.10.2 Genius I/O ............................................................................................................................................................................. 170
4.10.3 I/O System Diagnostic Data Collection ................................................................................................................... 172
4.11 Power-Up and Power-Down Sequences ....................................................................... 174
4.11.1 Power-Up Sequence ........................................................................................................................................................ 174
4.11.2 Power-Down Sequence.................................................................................................................................................. 175
4.11.3 Power Cycle Operation with an Energy Pack....................................................................................................... 176
4.11.4 Retention of Data Memory Across Power Failure ............................................................................................. 179
Chapter 5 Communications ........................................................................................................ 181
5.1 Ethernet Communications .............................................................................................. 182
5.1.1 Embedded Ethernet Interface .................................................................................................................................... 182
5.1.2 Ethernet Interface Modules ......................................................................................................................................... 187
5.2 Serial Communications ................................................................................................... 188
5.2.1 Serial Port Communications Capabilities .............................................................................................................. 188
5.2.2 Configurable STOP Mode Protocols ......................................................................................................................... 190
5.2.3 Serial Port Pin Assignments ......................................................................................................................................... 191
5.2.4 Serial Port Electrical Isolation ..................................................................................................................................... 195
5.2.5 Serial Cable Lengths and Shielding .......................................................................................................................... 196
5.2.6 Serial Port Baud Rates .................................................................................................................................................... 197
5.3 Series 90-70 Communications and Intelligent Option Modules ............................... 198
5.3.1 Communications Coprocessor Module (CMM) ................................................................................................... 198
5.3.2 Programmable Coprocessor Module (PCM) ......................................................................................................... 199
5.3.3 DLAN/DLAN+ (Drives Local Area Network) Interface ...................................................................................... 200
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