Model
RTX-12A
  - 1200 Baud (Bell 202) Data / Telemetry Modem. Plugs directly into a standard
25-pin serial port.
Model
RTX-12OEM
  - 1200 Baud (Bell 202) Data / Telemetry Modem.  This is an un-enclosed
circuit board that is electrically and functionally identical to the RTX-12A.