CTR124: 4 bit Address - 12 bit Data Encoder / Decoder
Control124 is a 4 bit address, 12 bit data encoder and decoder combined in a single IC. This device can operate in either Encode or Decode mode. It uses
1kbps differential Manchester bit balancing with preamble and checksum.CTR124 is specifically designed to be used in RF remote control applications.
It is available in 28pin SO and DIL packages.
It takes care of preamble, synchronisation, bit balancing and error checking and enables a transparent radio data link to be established between radio
devices. This is a half duplex unit, so collisions between transmitted and received packets must be dealt with by the user. Provided no two devices
attempt to transmit simultaneously no further restrictions on data transmission need be made, as all transmit timing, valid data identification and
data stream buffering is conducted by the unit. Synchronisation and framing words in the packet prevent the receiver outputting garbage in the absence
of wanted RF signal or presence of interference. Supports 1200 baud asynchronous data: 1 start bit, 8 data bits, 1 stop bit.
With typical microcontrollers and UARTs, direct connection is usable as shown on figures 2 & 3. To connect to a true RS232 device, inverting level
shifters must be used (MAX232 type are ideal, but simple NPN/PNP transistor switches often suffice as used in the application circuits figures 4 &
RPC-DEV is a designers development kit for the RPC transceiver. It contains 2 complete sets of hardware for a point to point link, each end may be operated
in one of 3 operating modes.
1. Stand alone
Selects the RPC's internal diagnostic modes 0 to 8 Enables self-test, range testing and software debugging. 2.
2. PC driven link
RPC is controlled directly by a Standard Printer Port (SPP with Open Collector / Pull-up control lines) or Extended Capabilities Port (ECP) set to
Byte Mode or PS/2 Mode. PC software supplied with the kit enables display and editing all RPC internal registers. Data packets may be sent to
The Eval-RPC (PIC16F84A-20I/P microcontroller) is based upon a modified RPC-000-DIL design and provides management of all the necessary data and control
lines. The user can define both operational mode and data bit rate simply by selecting the required positions on the provided DEBUG switch and the
various jumpers. Indication of unit status is provided by means of LEDs for Power, Transmit, Receive, Carrier Detect, Signal and OK (link success)