RFC-1 Advanced Operation page 6.45
6.8.9 Communication Mode
This adjustment sets the mode for incoming calls only. It has no effect on outgoing telephone calls.
The communication mode determines what type of connections the RFC-1 receives for monitoring and control. It
also determines whether the connection is part-time or full-time. A dial-up connection is typically part-time; the
connection is broken at the end of the call. A data connection can be part-time or full-time over a dedicated line.
The default communication mode for the RFC-1 is dial-up, voice connection. This is what the device was originally
designed to do and it is capable of operating this way with no additional hardware. The RFC-1 can operate over an
RS-232 serial data connection with additional hardware accessories. When used this way the RFC-1 responds to the
same commands as it does over a dial-up voice connection.
Remote data collection is possible through action sequence programming and date/time triggers. See action
sequence programming for more details.
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Voice mode and data mode are not mutually exclusive but only one communication port can be active at a time. The
RFC-1 can switch between the two modes seamlessly. When dial-up connections are used, the RFC-1 can be
programmed to answer in one mode, and then try the other mode if the first connection is not successful.
The RFC-1 also offers a dedicated control mode. When this feature is enabled, the RFC-1 remains active on the
selected port—it does not disconnect as it does at the end of a dial-up connection. Use of a dedicated port does not
limit use of the RFC-1 to only the dedicated port. If a dial-up connection occurs, the RFC-1 can suspend the
dedicated session and accept the dial-up connection. The RFC-1 will resume communication on the dedicated
connection when the dial-up connection is complete.
For example, the RFC-1 can support a dedicated data connection for normal operation. In an emergency, an
engineer can call the RFC-1 in voice mode and operate the system normally. The RFC-1 will resume data
communication when the call is complete.
* This is the default setting.
When the dedicated control mode is enabled over a voice connection, the RFC-1 activates the local phone port
whenever it is not busy with a call. Using this mode requires a full-time, voice-grade audio link and a DTMF tone
generator. The audio link transmits commands via DTMF tones to the RFC-1. Responses are sent back to the
remote site over the audio link. Details of the audio link are discussed in the installation section of this document.
When voice is the primary dial-up mode and data is the secondary mode, the main security code must be entered to
activate voice mode. This must occur before the RFC-1 security code timer expires. The RFC-1 will switch to data
mode if the timer expires before the code is entered. The time is set at address 1016—the incorrect security code
lockout time. The default setting of 10 seconds works well in most cases.
If data is the primary mode, the RFC-1 will switch to voice mode if the data device does not connect in a timely
manner. This is a safety measure to avoid being locked out of the system in an emergency.
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