90 NCA-2 Manual — P/N 52482:M5 03/20/2019
Appendix C: Wire Requirements
*In ACS mode, the distance is the total length of the EIA-485 cable from the NCA-2 to the last device on the circuit.
Circuit Type Circuit Function Wire Requirements
Distance
(ft/m)
Typical Wire Type
EIA-485
(power limited)
Connects to ACS
modules, or TM-4
Transmitter
Twisted-shielded pair with a
characteristic impedance of
120 ohms
18 AWG (0.75 mm
2
) minimum
6,000/1,829
(max)
*
16 AWG (1.30 mm
2
)
(e.g. Belden 9860)
EIA-232
(power limited)
Connects to Printers, or
PC
Twisted-shielded pair.
18 AWG (0.75 mm
2
) minimum
50/15.24 (without
modem)
16 AWG (1.30 mm
2
)
(e.g. Belden 9860)
Table C.1 Wire Requirements
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