Manual
8
Typical Characteristic Impedances of Control Wire
BELDEN SERIES NUMBER NOMINAL IMPEDANCE
9804 100 Ohms
8132 120 Ohms
9829 100 Ohms
8332 Not Rated
9501 Not Rated
8102 100 Ohms
9729 100 Ohms
8162 100 Ohms
9990 50 Ohms
*
9841 120 Ohms
9880 100 Ohms
8777 50 Ohms
*
9873 50 Ohms
*
9773 50 Ohms
*
*
EIA-485 drivers (on which DMX512 is based) are rated for a
minimum load impedance of 60 Ohms. Use of cables with a
characteristic impedance of less than 100 Ohms is not
recommended. If such cables are used, terminate with a
minimum of 60 Ohms. If the impedance of the control cable
is not known, a termination of 120 Ohms is recommended.