Specifications
Table Of Contents
- 1.0 System Overview
- 2.0 Product Description
- 2.1 Application Software
- 2.2 Custom Software Development
- 2.2.1 SITECONFIG-SVC - SiteScan Configuration Service Agreement
- Additional Benefits
- HIGRAPHIC - Create a Graphic
- HIGRAPHICM - Modify a Graphic
- HIGRAPHICUP - Upgrade SS2000W Graphic to SSWeb Java-Based Graphic (1)
- HIGRAPHICUP-5 - Upgrade SS2000W Graphics to SSWeb Java-Based Graphics (2-5)
- TEXTMOD - Customized Modifications
- MODCONFIG-4 - Modbus Configuration
- MODCONFIG-12 - Modbus Configuration
- BACCONFIG-4 - BACnet Configuration
- BACCONFIG-12 - BACnet Configuration
- 2.2.1 SITECONFIG-SVC - SiteScan Configuration Service Agreement
- 2.3 Gateway Modules
- 2.4 SiteLink Modules
- 2.5 Site I/O Modules
- 2.6 Stand-Alone Monitoring Modules
- 2.7 Module Accessories
- 2.8 ARCnet Communication Enhancement Devices
- 2.8.1 ARC156-KIT - ARCnet Kit
- 2.8.2 Other ARCnet Parts
- ARCDIAG485 - ARCnet156 Diagnostics Board
- ARCDIAG485WO - ARCnet156 Diagnostics Board Without Enclosure
- ARCPROT485 - ARCnet156 Surge Protection Board
- ARCPROT485WO - ARCnet156 Surge Protection Board Without Enclosure
- ARCREP485 - ARCnet156 Repeater Board (Signal Booster)
- ARCREP485WO - ARCnet156 Repeater Board Without Enclosure
- 2.9 Third-Party Interfaces
- 3.0 Application and Configuration
- 4.0 Upgrading SiteScan 2000 Systems to SiteScan Web
- 5.0 Third-Party and Building Management Interfaces
- 5.1 SiteScan Web and BACnet/IP to BMS
- 5.2 BACnet/IP to BMS Without a SiteScan Web Front-End
- 5.3 BMS Front-End Interfacing to Liebert Equipment by EIA-485 Modbus
- 5.4 SiteTPI-E with OpenComms NIC (or OpenComms 485)
- 5.5 Basic SiteTPI-E with Third-Party Equipment
- 5.6 SiteTPI-E and Third-Party Equipment with Different Modbus Protocol
- 6.0 ARCnet156
- 7.0 Wiring Guidelines
- Appendix A - Terminology

ARCnet156
32
6.3 Terminations
At 156 Kbps, a signal reaching the end of an unterminated cable can echo, or reflect back, creating a
distortion in the signal and degrading the quality of the communications. To prevent this, every seg-
ment on the ARC 156 network must have a 120 ohm terminator placed at each end of the segment.
To insert the 120 ohm terminator, make sure the module’s power is turned off and attach the termi-
nator to the CMnet positive and negative terminals. The 120 ohm terminating resistors are included
with the ARC156-KIT.
6.4 Wiring Recommendations
If bare communication wire comes in contact with the cable’s foil shield, drain/shield wire or a metal
surface other than the connector, the module might not communicate. When connecting the wire, fol-
low these guidelines:
• When stripping the outer jacket, take care not to nick the inner insulation. The wire’s outer jacket
is brittle enough to work free after being nicked or partially cut. Do not strip more than 1 in.
(25mm) of the outer jacket. See Figure 21.
Figure 21 Stripping an ARC156 wire
• Strip about 1/4 in. (6 mm) of the inner insulation. Do not allow more than 1/8 in. (3 mm) bare com-
munication wire to protrude from the connector. See Figure 22.
Figure 22 Screw terminal block connection
• Twist the drain or shield wires from both cables together before inserting them in the connector.
Inner
insulation
Outer
jacket
Foil
1 in.
(25mm)
1/4 in.
(6mm)
Correct
Incorrect
Incorrect
No more than 1/8 in. (3mm)
of bare wire