Honeywell PUB1012S Benutzerhandbuch

63-2689—05

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Cabling should be selected that meets or exceeds the BACnet 

Standard which specifies the following: An MS/TP EIA-485 

network shall use shielded, twisted-pair cable with 

characteristic impedance between 100 and 130 ohms. 

Distributed capacitance between conductors shall be less than 

100 pF per meter (30 pF per foot). Distributed capacitance 

between conductors and shield shall be less that 200 pF per 

meter (60 pF per foot). Foil or braided shields are acceptable. 

The Honeywell tested and recommended MS/TP cable is 

Honeywell Cable 3322 (18 AWG, 1-Pair, Shielded, Plenum 

cable), alternatively Honeywell Cable 3251 (22 AWG, 1-Pair, 

Shielded, Plenum cable) is available and meets the BACnet 

Standard requirements (www.honeywellcable.com).

The maximum BACnet MS/TP network Bus segment length is 

4,000 ft. (1,219 m) using recommended wire. Repeaters must 

be used when making runs longer than 4,000 ft. (1,219 m). A 

maximum of three repeaters can be used between any two 

devices.

The MS/TP MAC address for each device must be set to a 

unique value in the range of 0-127 on an MS/TP network 

segment (address 0, 1, 2, & 3 should be avoided as they are 

commonly used for the router, diagnostic tools, and as spare 

addresses). DIP switches on the Spyder BACnet controller are 

used to set the controller's MAC address.

To set the MS/TP MAC address of a Spyder BACnet controller:

1. Find an unused MAC address on the MS/TP network to 

which the Spyder BACnet controller connects.

2. Locate the DIP switch bank on the Spyder BACnet for 

addressing. This is labeled MAC Address

3. With the Spyder BACnet Controller powered down, set 

the DIP switches for the MAC Address you want. Add the 

value of DIP switches set to ON to determine the MAC 

address. See Table 6. Example, if only DIP switches 1, 3, 

5, and 7 are enabled the MAC address would be 85 (1 + 

4 + 16 + 64 = 85).

NOTE: See Fig. 15 on page 12 for DIP switch orienta-

tion and arrangement.

The Device Instance Number must be unique across the entire 

BACnet system network because it is used to uniquely identify 

the BACnet devices. It may be used to conveniently identify the 

BACnet device from other devices during installation. The 

Spyder BACnet Controllers Device Instance Number is 

automatically set when it is added to a WEBStation-AX project. 

The Device Instance Number can be changed by the user, 

which may be necessary when integrating with a third party or 

when attempting to replace an existing controller and it is 

desired to maintain the existing Device Instance Number.

To edit the Device Instance Number using WEBs AX:

1. Identify an unused Device Instance Number on the BAC-

net Network, in the range of 0 - 4194302.

2. Open the Spyder Bacnet Device Mgr View

a. Double click on the BacnetNetwork located in the 

Nav tree.

b. Select the Spyder Controller to be modified.

c. Click on the Edit button.

d. Enter an unused value in the Device Id field.

e. Select OK

3. Right Click on the Spyder Controller and select Actions > 

Write Device Instance to complete the update

Matched terminating resistors are required at each end of a 

segment bus wired across (+) and (-). Use matched precision 

resistors rated 1/4W ±1% / 80 - 130 Ohms. Ideally, the value of 

the terminating resistors should match the rated characteristic 

impedance of the installed cable. For example, if the installed 

MS/TP cable has a a listed characteristic impedance of 120 

Ohm, install 120 Ohm matched precision resistors.

Following proper MS/TP cabling shield grounding procedures 

is important to minimize the risk of communication problems 

and equipment damage caused by capacitive coupling. 

Capacitive coupling is caused by placing MS/TP cabling close 

to lines carrying higher voltage. The shield should be grounded 

on only one end of the MS/TP segment (typically the router 

end). Tie the shield through using the SHLD (terminal 4) on the 

Spyder BACnet Controller.

Sylk is a two wire, polarity insensitive bus that provides both 18 

VDC power and communications between a Sylk-enabled 

sensor and a Sylk-enabled controller. Using Sylk-enabled 

sensors saves I/O on the controller and is faster and cheaper 

to install since only two wires are needed and the bus is 

polarity insensitive. Sylk sensors are configured using the 

latest release of the Spyder Tool for WEBPro and WEBStation.

7

6

5

4

3

2

1

VALUE 64

32

16

8

4

2

1