Electro-Voice 250, 1252 operation manual 10-2

10.2: Hardware Connection

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-In Function

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-Out Function

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?

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.

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.

Electro Industries/GaugeTech Doc # E107706 V1.25 10-2