Limitorque
®
Master StationI V EEP-SN4001 FCD LMENIM5010-00-AQ – 03/19
17
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4.2 Master Station Wiring Requirements
Regarding the network cable which connects the field units to the Master Station, a shielded, twisted-pair cable must
be used. In particular, Belden 3074F, 3105A or 9841 cable should be used. The use of other cables may result in a
reduction of internodal distances or increased error rate, and is the user’s responsibility.
BELDEN 3074F SPECIFICATIONS
• Total cable length between repeaters or nodes with repeaters: up to 19.2 kbps: 4000’ (1.2km)
For loop mode, this is the total length between operating field units. If a field unit loses power, the relays internal to
the field unit connect the A1 Channel to the A2 Channel, which effectively doubles the length of the cable (assuming
a single field unit fails). To ensure operation within specifications in the event of power failure to field units, this
consideration must be added. Example: to ensure operation within specification when any two consecutive field units
lose power, the maximum length of cable up to 19.2 kbps should not exceed 4000’ (1.2 km) per every four field
units.
Key Specifications
• Resistance/1000 ft = 18 AWG (7 x 26) 6.92 ohms each conductor (13.84 ohms for the pair)
• Capacitance/ft = 14 pF (conductor-to-conductor)
• Capacitance/ft = 14 pF (conductor-to-shield)
BELDEN 3105A SPECIFICATIONS
• Total cable length between repeaters or nodes with repeaters: up to 19.2 kbps: 4000’ (1.2 km)
For loop mode, this is the total length between operating field units. If a field unit loses power, the relays internal to
the field unit connect the A1 Channel to the A2 Channel, which effectively doubles the length of the cable (assuming
a single field unit fails). To ensure operation within specifications in the event of power failure to field units, this
consideration must be added. Example: to ensure operation within specification when any two consecutive field units
lose power, the maximum length of cable up to 19.2 kbps should not exceed 4000’ (1.2 km) per every four field
units.
Key Specifications
• Resistance/1000 ft = 22 AWG (7 x 30) 14.7 ohms each conductor (29.4 ohms for the pair)
• Capacitance/ft = 11.0 pF (conductor-to-conductor)
• Capacitance/ft = 20.0 pF (conductor-to-shield)
BELDEN 9841 SPECIFICATIONS
• Total cable length between repeaters or nodes with repeaters: up to 19.2 kbps: 3500’ (1 km)
For loop mode, this is the total length between operating field units. If a field unit loses power, the relays internal to
the field unit connect the A1 Channel to the A2 Channel, which effectively doubles the length of the cable (assuming
a single field unit fails). To ensure operation within specifications in the event of power failure to field units, this
consideration must be added. Example: to ensure operation within specification when any two consecutive field units
lose power, the maximum length of cable up to 19.2 kbps should not exceed 3500’ (1 km) per every four field units.
Key Specifications
• Resistance/1000 ft = 24 AWG (7 x 32) 24 ohms each conductor (48 ohms for the pair)
• Capacitance/ft = 12.8 pF (conductor-to-conductor)
• Capacitance/ft = 23 pF (conductor-to-shield)
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