Contemporary Controls BASRT-B Installation Manual - Page 12

Browse online or download pdf Installation Manual for Network Router Contemporary Controls BASRT-B. Contemporary Controls BASRT-B 20 pages. Bacnet/ip to ms/tp router

Print Page
Figure 11 — Isolated EIA-485 Transceiver Circuitry
The router can address 254 MS/TP devices and supports 31 devices
on the local bus at rates of 9600, 19200, 38400, or 76800 bps.
EIA-485 Bias and Termination Jumpers
After removing the BASRT-B cover, three jumpers are accessible
on a 6-pin jumper block located near the MS/TP connector. These
impart 604 ohms of pull-up and pull-down bias at jumpers U and
D, and 130 ohms of termination impedance for the T jumper. With
all three jumpers installed, the effective termination resistance is
120 Ω — consistent with the BACnet standard. If the BASRT-B
is not installed at the end of a segment, remove all the jumpers
and install 120 Ω at the far end of the bus.

Ethernet Port

This port offers a shielded RJ-45 connector. Through auto-negotiation
and Auto-MDIX, it automatically matches its duplex setting, data
rate and communication pair usage to whatever is needed by the
attached equipment. Thus, any CAT5 cable (cross-over or straight-
through) may be used to connect to the Ethernet.

IP Address Reset Switch

To reset the router to it's default values of the IP address
(192.168.92.68), gateway address (192.168.92.1) and netmask (/24
or 255.255.255.0), use a paperclip or similar tool to press the reset
button for at least 3 seconds while the router is powered. Release
the reset button. Then remove power from the router for 3 seconds.
Restore power and the unit will now use the default values.
TD071200-0IC
12