RFC-1 Advanced Operation page 6.5
6.3 Telemetry Channels
Incorrect use of the following information can cause unexpected or undesirable behavior. We
strongly recommend that you understand the basic operation of the RFC-1 and the specifics of
the installation before continuing. If you have not done so already, please read the
documentation above that describes the Advanced Programming Mode before continuing.
Each telemetry channel in the RFC-1 can deliver a status indication or an analog reading with unit word and decimal
point. Channels work either way in the factory setting with default scale. Instead of reading 0000 at the bottom of the
scale, the RFC-1 says “status off”. Instead of reading 2040 at the top of the scale, the RFC-1 says “status on”.
Readings in between are delivered as a 4-digit number with no unit word or decimal point.
To use a channel as a status indicator with the factory settings, apply the voltage and adjust the telemetry calibration
pot until the “status on” reading is delivered. The “status off” reading will be delivered when the voltage is removed.
In cases where the factory settings are not appropriate, any channel can be programmed as a dedicated status
channel or as a purely analog channel. Other status word combinations are also available with this adjustment.
6.3.1 Telemetry Channel Programming
The behavior of a telemetry channel is controlled by four parameters stored in the RFC-1. Each channel is assigned
its own four addresses where these parameters are stored.
• The first two addresses identify the unit word for analog channels or the word pair for status
channels.
• The third address sets the scale (maximum reading) and the decimal point location.
• The fourth address sets the type of scale (linear/logarithmic) and controls other options
The programming address table in Appendix A provides a list of all the memory address and their functions.
Telemetry channel descriptions occupy addresses 0000-0255 in the table.
Telemetry readings are identified by the channel number. Descriptive names cannot be assigned to a channel.
6.3.2 Unit Words
A unit word is a descriptive word that the RFC-1 says after the telemetry reading for a channel. The available words:
kilovolts, amperes, etc. are listed in the Word Table in the Appendix along with a two-digit code identifying each word.
Program the word codes into the first two channel addresses to assign a unit word to the channel.
For example, suppose you want to program Channel 00 with the unit word “kilovolts”.
1. Enter the Advanced Programming Mode: 80
2. Enter the Advanced Programming Security Code: 4150
3. Enter the starting address from the Address Table for Channel 00 telemetry units: 0000
4. Find the word “kilovolts” in the Word Table and get the values V1 and V2: V1=4, V2=2
5. Enter V1 for the word “kilovolts”: 4
6. Press the # key to enter this value and increment to the next address in memory
7. Enter V2 for the word “kilovolts”: 2
8. Press the # key to enter this value and increment to the next address in memory
9. Press the ❊ key to exit programming mode and return to operating mode
When a user selects channel 00, the RFC-1 will give the telemetry value followed by the unit word “kilovolts”.
To Next Page
Loading...
Need help?
General
