6
IM702-3
Light Emitting Diodes (LEDs)
The communications module has three LEDs to indicate communication activity and status of the communication module
LED
Function
DS1
•
Lights when the service pin is pressed
•
Lights when there is a problem with the module
DS2
•
On Steady during normal operation
•
Blink during a Wink command
DS3
•
Flicker during Communications Activity
•
Blink during a Wink command
LonWorks Network Connector (P8)
The P8 connector connects the MicroTech II LonWorks Communications Module to the LonWorks FTT-10A bus
Pin
Designation
Function
1
None
No Connection
2
- (minus sign)
FTT-10A
3
+ (plus sign)
FTT-10B
12-Pin Header
The 12-pin header, J6, connects the unit controller Main Control Board to the LonWorks communications module through
the bottom of the communications module.
LonMark Profile Software
The MicroTech II LonWorks Communications Module software translates the Standard Network Variable Types (SNVTs)
and Standard Network Configuration Parameters (SCPTs) in accordance with the LonMark profiles used on the LonWorks
network into the variables and parameters used in the MicroTech II Main Control Board.
Neuron
The basis of the communications module is an Echelon Neuron chip. Each Neuron chip stores a globally (i.e., worldwide)
unique, 48-bit serial number called the Neuron ID. The Neuron ID can be used to address the device on the LonWorks
network.
Transceiver
The Echelon Corporation Free Topology Transceiver (FTT-10A) is used to communicate on the LonWorks network. The
network topology may consist of a: star, daisy-chain, or other topology. Data transmission rate on the network is 78 kbps
(baud).
Specifications
Characteristic
Description
Network Topology
Flexible Free Topology
Neuron Chip Processor
3150
Free Topology Transceiver (FTT-10A)
50051
Cable Types
TIA Category 5 (recommended)
Maximum Bus Length
1476 ft (450) meters per segment
Maximum Node Separation
820 ft (250 meters)
Data Transmission
Two-wire, half duplex
Data Transmission Rate
78 kbps (baud)
