Specifications

RFC-1 Basic Operation page 5.3
5.3 Operation from a Remote Telephone
Operating the RFC-1 from a remote telephone is very much like operating it from the local phone. The primary
difference is that the connection is made from a remote location through a telephone line. A user dials the telephone
number at the site where the RFC-1 is installed. The RFC-1 answers and requests a security code. When the
correct code is given, the RFC-1 allows user access. After that, operation is the same from local or remote phones.
5.3.1 Connecting to the RFC-1
The RFC-1 should be connected to a telephone line when it is installed. The first step in connecting to the RFC-1
from a remote location is to call the telephone number. The RFC-1 will answer after two rings and say, “enter
security code”. After the user enters the correct main security code, the RFC-1 identifies itself with the phrase, “this is
RFC-1/B”, and awaits further commands.
The factory setting for the main security code is 12345678. The user has a 10 second window in which to enter this
code. If the correct code is not entered, the RFC-1 says, “error, goodbye” and disconnects from the line.
For security reasons the RFC-1 does not identify itself until the security code is entered. If someone dials the number
by accident, the RFC-1 has not given any useful information.
The RFC-1 can have only one connection active at a time. If an engineer is operating the RFC-1 locally and another
user calls the system, the RFC-1 will alert the local user of the incoming call by saying, “telephone ring-ring”. The
local call will not be interrupted. The incoming call is ignored and the remote user must call back.
5.3.2 Operating the RFC-1
The procedure for taking readings and operating control relays is the same from a remote telephone as it is from the
local phone. In fact, the RFC-1 behaves almost exactly the same when operated from a remote telephone as it does
from the local phone. There are only a few differences:
• Remote connections require a security code before access is granted to the system
• A remote call in progress will be disconnected if the local control button is pressed
• Security code programming commands are not allowed from a remote phone
• The basic programming security code is only required from a remote connection
Most system adjustments require a security code to be entered before changes are allowed. Since direct access to
the RFC-1 is typically restricted, the security code is not requested when changes are made from the local phone.
5.3.3 Disconnecting from the RFC-1
To complete a session with the RFC-1, enter the command 99 and hang up the local phone. The RFC-1 will say
“goodbye” when it receives the hang-up command. If the hang-up command is not issued on a remote call, the RFC-
1 will usually disconnect instantly. If it does not, it will disconnect automatically after 2.5 minutes of inactivity.
A session can also be terminated with the command 98 instead of 99. When the command 98 is issued, the RFC-1
disconnects as it does with 99 and it ignores incoming calls for 90 second. This can be useful if the RFC-1 shares
the telephone line with other devices.