Rotem P-COMM-V1 - RS-485 Approximate Distances & Baud Rates

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Figure 6: Connecting the External Connection box to Controllers via RS-ISO485 Cards
• The cable between the external connection box and the controllers should be a two pair
twisted shield cable.
• This cable is daisy-chained to all controllers and to external connection box.
o 1
st
pair:
 Red wire to the controller's terminal A and the external connection box's
terminal A.
 Black wire to the controller's terminal B and the external connection box's
terminal B.
o 2
nd
pair:
 Green wire to the controller's COM terminal and the external connection box's
COM terminal.
6.3.2 RS-485 Approximate Distances & Baud Rates
For one controller
For 10 controllers:
• 2000 meters (~6500 feet): 9600 Baud • ~1200 meter (~4000 feet): 9600 Baud
• ~2500 meters (~8200 feet): 4800 Baud • ~1800 meter (~6000 feet): 4800 Baud
• ~3000 meters (~9800 feet): 2400 Baud • ~2400 meter (~7870 feet): 2400 Baud
NOTE: Baud rate is dependent on cable length and number of controllers.