USE LOW CAPACITANCE CABLE TO
MAXIMIZE i2x0 DB25 NETWORK SPEED
REFERENCE > ADVANCED TECHNIQUES >

To maximize your instruNet network speed, it is recommended that you use low capacitance 25wire (DB25M/DB25F) cable, especially with long distances (e.g. >10meters).

If you are transmitting power over long distances, the following 24 Gage cable is recommended:

    Belden Cable Part #8112

• Low Capacitance, RS-485/RS-232 Cable
• Available in 100ft, 500ft, and 1000ft lengths
• 12.5 Pairs, with copper braided shield
• 24 Gage wire
• 41pF/meter between pairs
• 72pF/meter between a wire and the shield
• 78ohms/killometer wire resistance

If you are NOT transmitting power over long distances, the following 28 Gage cable is a little less money, and is just as capable as the above 24 Gage model.

    Belden Cable Part #88142

• Low Capacitance, RS-485/RS-232 Cable
• Available in 100ft, 500ft, and 1000ft lengths
• 12.5 Pairs, with copper braided shield
• 28 Gage wire
• 36pF/meter between pairs
• 65pF/meter between a wire and the shield
• 213ohms/killometer wire resistance

Regular cable (i.e. not "low capacitance") typically sports 3 times the capacitance as the above models, and will therefore cause the instruNet data transfer rates (e.g. maximum sample rate) to reduce by a factor of 3 or so.