10.5.2 Connecting a Host Computer to a Hydran 201Ci Controller in a Local
Network, using an RS-485 Cable ..................................................................................... 153
10.5.3 Verifying RS-232 or USB and RS-485 Communications .......................................... 153
10.6 Optional Modem Installation........................................................................................................... 154
10.6.1 Connecting a Telephone Line ........................................................................................... 154
10.6.2 Verifying Communications between the Two Modems .......................................... 154
10.6.3 Configuring the Call OnAlarm Mode ............................................................................... 155
11 ALARMS ..................................................................................................................................... 156
11.1 Alarm Levels .......................................................................................................................................... 157
11.1.1 Alarm Conditions ................................................................................................................... 157
11.1.2 Purpose of Hourly and Daily Trends ............................................................................... 158
11.2 Alarm Relays ......................................................................................................................................... 158
11.2.1 Alarm Contacts ...................................................................................................................... 159
11.2.2 Status of Alarm Relays ........................................................................................................ 159
11.2.3 Operation Modes of Alarm Relays ................................................................................... 160
11.3 Alarm Interface .................................................................................................................................... 161
11.4 Gas High and High-High Alarms ................................................................................................... 162
11.4.1 Alarm Parameters Setting .................................................................................................. 162
11.4.2 Guidelines for Setting Trend Alarms ............................................................................... 164
11.4.3 Hourly and Daily Trend Computations .......................................................................... 165
11.4.4 High and High-High Alarms Triggering ......................................................................... 166
11.4.5 High and High-High Alarms Cancellation .................................................................... 167
11.5 Fail Alarm ............................................................................................................................................... 167
11.5.1 Fail Alarm Triggering ............................................................................................................ 167
11.5.2 Fault Triggers .......................................................................................................................... 168
11.5.3 Fail Alarm Cancellation ....................................................................................................... 171
12 OPERATING THE HYDRAN 201I SYSTEM .............................................................................. 172
12.1 Operating Methods............................................................................................................................. 172
12.1.1 Periodic, Visual Monitoring ................................................................................................ 172
12.1.2 Alarm Monitoring ................................................................................................................... 173
12.1.3 Analog Output Monitoring ................................................................................................. 173
12.1.4 Combined Alarm and Analog Output Monitoring ...................................................... 174
12.1.5 Local Monitoring With Host Computer .......................................................................... 175
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