Echelon LONWORKS, User Manual, Page: 29 / 68

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RTR-10 Module User’s Guide 4-7
ACLK2, BCLK1, and BCLK2
A 10-MHz crystal is provided for Side A of the RTR-10 router, which can only run at 10
MHz. This clock rate allows Side A to be used with transceivers running at interface bit
rates from 9.8kbps to 1.25Mbps. The 10-MHz clock is output on the ACLK2 pin, allowing
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
610bps. ACLK2 can drive 5 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 Chapter 6 of the
Neuron Chip
Data Book .
~ASVC and ~BSVC
Each side of the RTR-10 router has an independent service output : ~ASVC for the A
Side and ~BSVC for the B Side. These outputs may be attached to service LEDs as
shown in figure 5.1. The function of the service pin is described in Chapter 9 of
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, and on means that the side
has failed.
AXID [4..0] and BXID [4..0]
The RTR-10 router comes preconfigured with many common L
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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 all
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 table 4.2 are loaded. If
the router is being re-powered-up, and the transceiver ID is not 30, the RTR-10
firmware compares the network bit rate and input clock for the specified transceiver to
the current transceiver parameters. If these parameters don’t match, than all
transceiver parameters are reinitialized. This allows a network services tool to change
parameters, such as the number of priority slots, without the new values being
overwritten by the RTR-10 firmware.