RFC-1 Basic Operation page 5.2
5.2.3 Reading Telemetry Channels
Taking a telemetry reading is as simple as selecting a channel. The RFC-1 responds with the current telemetry value
as soon as the channel is selected. For example, enter 03 on the keypad to take a reading on channel 3. The RFC-1
responds “Channel 03” followed by a four-digit reading or, depending on the calibration, it may give a status reading.
Telemetry is reported when:
• A channel is selected
• After a control function
• The telemetry value of the selected channel changes by more than 10% of the full scale
To simplify telemetry logging, the RFC-1 can scan the channels and report the telemetry values with a single
command. This is an “auto-scan”. Enter the command 64 to perform an auto-scan. The RFC-1 responds with "auto-
scan" and then reads the telemetry values for channel 00 through 07. Interrupt the scan by entering any command.
5.2.4 Operating the Control Relays
Each channel has two control relays associated with it: one for “on/raise” functions and one for “off/lower” functions.
• Press the # key to operate the on/raise relay
• Press the ❊ key to operate the off/lower relay
To activate a control relay, select a channel then press either of the control keys # or ❊. If the control security code
has not been entered, the RFC-1 will request it.
The control relays will operate as long as a control key is pressed, or for a minimum of about one-half second. A
channel must be selected and the control security code must be entered to operate the control relays.
The control security code prevents unauthorized users from controlling the devices that are connected to the RFC-1
control relays. System operation can be restricted so that some operators have the ability to take telemetry readings
but not to make adjustments. The control security code is factory programmed to 66.
If an attempt is made to operate the control relays without giving the control security code, the RFC-1 will request it
by saying: “enter control security code”. If the correct code is not given, the RFC-1 will stop responding to
commands and disconnect.
5.2.5 Issuing Other Commands
The RFC-1 recognizes commands besides those required for selecting and controlling the channels. The command
set is discussed in this section and in the next. All commands are two digits long and generate a spoken response.
It is not necessary to wait for the RFC-1 to finish speaking before issuing another command.
5.2.6 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, the RFC-1 will disconnect
automatically after 2.5 minutes of inactivity.
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