PUB6438S, PUB6438SR: 5.45 x 6.85 x 2.26 in. (13.84 x 17.40 x 5.74 cm)
Hardware (PVB0000AS, PUB1012S, PUB4024S, PVB4022AS, and PVB4024NS)
CPU
Each controller uses a 32 bit ATMEL ARM 7 microprocessor.
Memory Capacity
Flash Memory: 512 kilobytes. The controller is able to retain Flash memory settings for up to ten (10) years.
RAM: 128 kilobytes
Controller Status LED
The LED on the front of the controller provides a visual indication of the status of the device. When the controller receives power, the LED appears in one of the following allowable states, as described in Table 3.
Hardware (PUB6438S, PUB6438SR, PVB6436AS, and PVB6438NS)
CPU
Each controller uses a pair of microprocessors. The first is a 16-bit Texas Instruments MSP430 family microprocessor that is used to manage the Inputs, Outputs and Control. The second is a 32-bit ATMEL ARM 7 microprocessor that manages communication for the Spyder BACnet.
Memory Capacity
Flash Memory: 372 kilobytes. The controller is able to retain Flash memory settings for up to ten (10) years.
RAM: 72 kilobytes

MS/TP MAC Address
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. DIP switches on the Spyder BACnet controller are used to set the controller's MAC address.
Device Instance Number
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.
Termination Resistors
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.
Shield Terminating
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™ Bus
Sylk is a two wire, polarity insensitive bus that provides both 18 VDC power and communications between a Sylkenabled sensor and a Sylk-enabled controller. Using Sylkenabled 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.
