Connection via Serial Link
The serial link connection can be used to configure and communicate with an external modem (Radio/PSTN/GSM).
By default, the modem waits for an incoming call (Dial-in mode). When it receives an incoming call, try to establish the connection.
NOTE: In the Dial-out mode, the serial link connection via modem can be created in the Permanent mode (automatic connection at startup, at reboot or after connection loss) or in the On-demand mode (by an internal register command).
NOTE: In the On-demand mode, Dial out is prior to Dial in. and Dial out may interrupt established connection in Dial in mode.
Connection Point-to-Point Protocol via Serial Link
The RTU module supports PPP connections over serial links via a modem (PSTN/GSM/GPRS).
With a PPP connection, once a telephone connection has been established, the modem link is treated as a TCP/IP link.
A PPP connection enables two specific modes:
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Server mode, which is the Dial-in mode
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Client mode, which is the Dial-out mode.
NOTE: In the Client mode, the PPP connection via modem can be created in the Permanent mode (automatic connection at startup, at reboot or after connection loss) or in the On-demand mode (by an internal register command).
NOTE: For PPP connection authentication, the identification uses the Password Authentication Protocol (PAP). Use PAP to configure any device that has a modem/PPP connection with the RTU module. The Challenge Handshake Authentication Protocol (CHAP) is not implemented on the module. For an accepted connection, the PAP Username and Password of the remote device must be known. The RTU module password and user name used by the PAP protocol are the same as those of the HTTP server (by default: USER/USER).
The local IP address of the RTU module can be configured using the IP address either:
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specified by the User directly from the website. This is mandatory if the module is in Server mode.
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obtained from the PPP server (if specifying 0.0.0.0 as local IP) when establishing connection in Client mode. The IP can then be a static or a dynamic address.
NOTE: In Server mode and no IP address is given by the User, the Server assigns a fixed IP to the remote device with local IP+1. For example if the server IP is 90.0.0.2, remote device IP is then 90.0.0.3.
NOTE: GPRS does not support server mode.
Connection PPPoe via Ethernet Link
The Ethernet link connection can be used to configure and communicate with an external modem (type ADSL).
PPPoe connection is only available using Client mode (Server mode not supported).
NOTE: In the Client mode, the PPPoe connection via modem can be created in the Permanent mode (automatic connection at startup, at reboot or after connection loss) or in the On-demand mode (by an internal register command).
NOTE: For PPPoe connection authentication, the identification uses the Password Authentication Protocol (PAP). Use PAP to configure any device that has a modem/PPPoe connection with the RTU module. The Challenge Handshake Authentication Protocol (CHAP) is not implemented on the module. For an accepted connection, the PAP Username and Password of the remote device may be configured in PPPoe panel from the website.
The configuration of IP address is not available for users. The RTU module obtains a static or dynamic IP address when the PPPoe connection is established.
