Echelon LONWORKS PLT-22, User Manual

Page: 34 / 128

Table 3.3 Channel Definition Parameters for the PLT-22 Transceiver (continued)
Comm Mode Specific Parameters
Channel Bit Rate 3987 bps
Alternate Bit Rate 3987 bps
Wakeup Pin Dir Output
Xcvr Controls Preamble? Yes
General Purpose Data (power management disabled)
CENELEC Access Protocol OFF
CENELEC Access Protocol ON
General Purpose Data (power management enabled)
CENELEC Access Protocol OFF
CENELEC Access Protocol ON
0E 01 00 10 00 00 00
4A 00 00 10 00 00 00
0E 01 00 12 00 00 00
4A 00 00 12 00 00 00
Allow Node Override?
PL-20N, PL20C PL-20N-LOW, PL-20C-LOW
YES
Layer 1 Time Factors
Rcv Start Delay 7.3 bits
Rcv End Delay 1.6 bits
Indeterm Time 10.1 bits
Min Interpacket 17.5 bits
Preamble Len 33.5 bits
Use Raw Data? No
The standard transceiver definitions in table 3.1 were chosen as the best balance between
flexibility in network design and network throughput. Flexibility is provided by the
selection of 8 priority slots on the channel and a minimum input clock of 2.5MHz (a Neuron
Chip input clock frequency as low as 2.5MHz may be chosen in order to reduce node power
consumption). These parameters support a packet rate of 10 packets/sec with 80%
throughput, 4% collisions, and 11 byte packets.
!
Note that when the PLT-22 transceiver is operated in its dual carrier mode, the minimum
Neuron Chip clock is 2.5MHz. When the PLT-22 transceiver is operated in its single carrier
frequency mode, the minimum Neuron Chip clock is 1.25MHz.
3-8 PLT-22 Transceiver Programming