Siemens HydroRanger 200 Instruction Manual page 104

P778 Modem Available
Sets the HydroRanger 200 to use an external modem.
Primary Index
Values
P779 Modem Inactivity Timeout
Sets the time that the unit will keep the modem connected with no activity.
Primary Index
Values
To use this parameter, ensure that P778 (Modem Available) =1. Ensure that the value is
low enough to avoid unnecessary delays when an unexpected disconnect occurs but
long enough to avoid timeout while you are still legitimately connected. This parameter
value is ignored by the Modbus Master Drivers as they automatically disconnect when
done communicating.
Hanging Up
If the line is idle and the P779 Modem Inactivity Timeout expires, then the modem is
directed to hang up the line. Ensure that P779 is set longer than the standard polling time
of the connected master device. Set P779 to 0 to disable the inactivity timer.
P782 Parameter Index Location
Determines where index information is stored for the parameter access area for the
Modbus register map.
Primary Index
Values
For more on Parameter Index Location, see
Page 94
Communications Port
0 * No modem connected
1 Answer only
Communications Port
Range: 0-9999 seconds
0 * No timeout
Global
0 * Global
1 Parameter-Specific
HydroRanger 200 – INSTRUCTION MANUAL
Parameter Access
on page 100.
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