Echelon LonWorks Router - Manual (Page 34)

ACLK2, BCLK1, and BCLK2
A 10 MHz crystal is provided for Side A of the RTR-10 router, which can run at
only 10 MHz. This clock rate allows Side A to be used with transceivers running
at interface bit rates from 9.8 kbps to 1.25 Mbps. The 10 MHz clock is output on
the ACLK2 pin, which allows Side B to be tied directly to the same clock through
pin BCLK1. Thus, no external components are required to support the same
range of bit rates on Side B.
The 10 MHz output can be divided to a lower frequency with external hardware,
and used as the input clock for Side B to support transceivers running at
interface bit rates as low as 610 bps.
ACLK2 can drive five LS-TTL loads.
ACP[4..0] and BCP[4..0]
The ACP[4..0] and BCP[4..0] signals are connected to the CP[4..0] pins of the
core module Neuron Chips. The function of these pins is described in the Neuron
Chip Data Book.
ASVC~ and BSVC~
Each side of the RTR-10 router has an independent service-pin output: ASVC~
for the A Side and BSVC~ for the B Side. You can connect these output pins to
service LEDs, as shown in Figure 27 (in chapter 4). The function of the service
pin is described in the Neuron Chip Data Book. The internal pullup resistor for
the service pin on each side is enabled.
The service LEDs reflect the firmware status:
• Blinking means that the router side is unconfigured
• Off means that the side is configured
• On means that the side has failed
AXID[4..0] and BXID[4..0]
The RTR-10 router comes preconfigured with many common L ON W ORKS
transceiver parameters. Two sets of five transceiver identification (ID) pins on
the RTR-10 router select the appropriate transceiver type for each side. The
transceiver ID inputs eliminate a manufacturing step by automatically
configuring the RTR-10 router for most transceivers. A special transceiver ID is
reserved for programming any custom transceiver type; this value causes the
communication port pins to be configured as inputs so that no line will be driven
by both the transceiver and RTR-10 Neuron before the RTR-10 Neuron Chips can
be properly configured.
The RTR-10 firmware reads the transceiver ID inputs on power up and reset. If
the router is being powered-up for the first time, or if the transceiver ID is
different from the last time it was powered-up, the parameters specified in the
table on page 25 are loaded. If the router is being re-powered-up, and the
transceiver ID is not 30 (0x1E), the RTR-10 firmware compares the network bit
rate and input clock for the specified transceiver to the current transceiver
parameters. If these parameters do not match, all transceiver parameters are
24 LONWORKS Router Electrical Interfaces