You can go to the Captive Works website and they have some details on specs on their web page.
It says RS232 only.
I read here:
hxxp://www.captiveworks.com/cw650s_c.php#Standard%20Features
Also posting specs here:
Standard Features:- MPEG-2 Digital and Fully DVB-S Compliant
- SCPC/MCPC Receivable from C/KU band Satellite
- User Friendly OSD Menu with Full Function
- Installation by Easy Setup Guide
- 100 Satellites, 6000 Channels and 5000 transponders
- Brilliant On Screen Graphic
- Small Picture in Graphic and Zoom Function
- 8 Favorite Groups and Parent Lock Function
- EPG, including 7 days data fast download and timer
- Supports DiSEqC 1.0/1.2/1.3(USALS) and 22KHz Tone
Outstanding Value:- 256 Color Graphic User Interface
- Super Fast 800 Pages OSD Teletext Supported
- Multi Pictures Selection 4/9/10/12/13/16
- High Sensitivity QPSK Tuner and Demodulator
- Multi Timer Function and Favor
- Network Search and Easy Tuning
- Multi Languages: English/German/French/Italian/Spanish/Arabic/Turkish/Persian/Dutch
- Support 20 Audio PID (Language)
- Fast Channel Switching
- RS232 Port for Additional Information Service and Upgrading Software
Optional Features:- S-Video Output
- Zoom and Games
- Universal Remote Controller(TV/VCR/DVD/STB)
- CH3/CH4 RF Modulator with NTSC M 14-83
Technical Specification:
TunerInput Frequency950MHz-2150MHzRF Input Signal Level-65 – 25dBmLNB Power13/18V DC (+/-.5%), 0.5A max, overload protectDiSEqC1.0/1.2/1.3 Tone Burst A/B
RF Modulator:Output Level: CH3, CH4TV StandardNTSC
Demodulator:WaveformQPSKSymbol Rate1 to 45 M s/sFEC1/2, 2/3, 3/4, 5/6, 7/8SCPC and MCPC Capable
System and Memory:Main ProcessorCx24142, Speed 160MHzFlash Memory4MBSDRAM32MB
Audio Decoder:Audio ChannelMono, Dual Channel, Stereo, Joint StereoAudio Modempeg-1/2 Audio layer I&IISampling Freq32/44.1/48KHz
Video Decoder:Profile RateMPEG-2MP@MLInput RateMax. 15M bit/sVideo SystemNTSC<->PAL converterVideo Format4:3, 16:9 (Letter Box) Pan&ScanVideo Resolution720x576 (PAL), 720X480 (NTSC)
Power Supply:Input VoltageAC 100V-240V, 50/60MHzPower Consumption25W Max
Summary of Connectors:Audio Output2xRCA(L/R)Video Output1Xrca, S-VIDEO0/12V Output1XrcaSerial Port RS2329-Pin D-Sub, MaleRF connectorIEC Male to Female
Physical Specification:Operating Temp0 to 40 CNet Weight1.8kgsDimensions280*235*56mm