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Doc # E107706 V1.25 10-2
10.2:
Hardware
Connection
Q
Use RJ-11 Standard Telephone Line to connect with an INP2 Option Nexus. The RJ-11 line is
inserted into the RJ-11 Port on the face of the Nexus 1250/1252 with Internal Modem Option. The
connection using RJ-11 into the Nexus is virtually unlimited, since it utilizes a PSTN (Public
Switched Telephone Network). To connect with other Nexus 1250/1252 Monitors in either local or
remote locations, you MUST use Port 2 as a Master and an RS-485 connection to any port on the
remote Nexus. The Address of the remote Nexus MUST be something other than “1”. The link
using RS-485 is viable for up to 4000 feet (1219 meters).
10.3:
Dial-IIn
Function
Q
The modem continuously monitors the telephone line to detect an incoming call. When an
incoming call is detected, the modem will wait a user-set number of rings and answer the call. The
modem can be programmed to check passwords and lock out unsuccessful attempts to connect.
When an incoming call is successfully connected, the control of communications is passed to the
calling software program. The modem will respond to computer demands to download data or
perform other actions authorized by the meter passwords.
10.4:
Dial-OOut
Function
Q
The Dial-Out Function is intended to allow the meter to automatically report certain conditions
without user intervention. The modem is normally polling the meter to determine if any abnormal
or reportable conditions exist. The modem checks the following meter conditions and programmed
events (set in Nexus Communicator) to determine if a call should be placed.
• Are any meter set-point limits exceeded?
• Has status of high-speed inputs changed?
• Has waveform been recorded?
• Has power quality event been recorded?
• Has a control output changed?
• Is either history log approaching a full condition?
• Is the event log approaching a full condition?
• Is any other log approaching a full condition?
• Has the Modem Password failed?
• Has Communication with the Nexus failed?
Q
If any of the monitored events exist, the modem will automatically initiate a call to a specified
location to make a report or perform some other function. For log full conditions, the meter will
automatically download the log(s) that are nearing the full state. The modem can be programmed to
call two different numbers to make the required reports, Primary and Backup.
Q
The modem can be programmed with an ASCII string for identification purposes. If this string is
present, the modem will play the string to the host computer upon connection to identify the meter
to the host software.
Refer to the Communicator EXT Software Manual for programming details.