| Fig. 27 — BT485 Terminator Installation | |
| Table 8 — MS/TP Wiring Recommendations | |
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SPECIFICATION |
| RECOMMMENDATION |
Cable |
| Single twisted pair, low capacitance, CL2P, 22 AWG (7x30), TC foam FEP, plenum rated cable |
Conductor |
| 22 or 24 AWG stranded copper (tin plated) |
Insulation |
| Foamed FEP 0.015 in. (0.381 mm) wall 0.060 in. (1.524 mm) O.D. |
Color Code |
| Black/White |
Twist Lay |
| 2 in. (50.8 mm) lay on pair 6 twists/foot (20 twists/meter) nominal |
Shielding |
| Aluminum/Mylar shield with 24 AWG TC drain wire |
Jacket |
| SmokeGard Jacket (SmokeGard PVC) 0.021 in. (0.5334 mm) wall 0.175 in. (4.445 mm) O.D. |
| Halar Jacket | |
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DC Resistance |
| 15.2 Ohms/1000 feet (50 Ohms/km) nominal |
Capacitance |
| 12.5 pF/ft (41 pF/meter) nominal conductor to conductor |
Characteristic Impedance |
| 100 Ohms nominal |
Weight |
| 12 lb/1000 feet (17.9 kg/km) |
UL Temperature Rating |
| SmokeGard 167°F (75°C), Halar |
Voltage |
| 300 Vac, power limited |
Listing |
| UL: NEC CL2P, or better |
| LEGEND |
AWG | — American Wire Gage |
CL2P | — Class 2 Plenum Cable |
DC | — Direct Current |
FEP | — Fluorinated Ethylene Polymer |
NEC | — National Electrical Code |
O.D. | — Outside Diameter |
TC | — Tinned Copper |
UL | — Underwriters Laboratories |
TO ADDRESS THE UPC OPEN CONTROLLER — The user must give the UPC Open controller an address that is unique on the BACnet network. Perform the following proce- dure to assign an address:
1.If the UPC Open controller is powered, pull the screw ter- minal connector from the controller's power terminals la- beled Gnd and HOT. The controller reads the address each time power is applied to it.
2.Using the rotary switches (see Fig. 25 and 28), set the controller's address. Set the Tens (10's) switch to the tens digit of the address, and set the Ones (1's) switch to the ones digit.
As an example in Fig. 28, if the controller’s address is 25, point the arrow on the Tens (10's) switch to 2 and the arrow on the Ones (1's) switch to 5.
9 | 0 | 1 |
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8 |
| 2 | 10's | |
7 |
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| 3 | |
6 |
| 4 |
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5 |
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9 | 0 | 1 |
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8 |
| 2 |
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7 |
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| 3 | 1's |
6 |
| 4 |
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5 |
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Fig. 28 — Address Rotary Switches
BACNET DEVICE INSTANCE ADDRESS — The UPC Open controller also has a BACnet Device Instance address. This Device Instance MUST be unique for the complete BAC- net system in which the UPC Open controller is installed. The Device Instance is auto generated by default and is derived by
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