Defaulting The Interface Boxes - Allen-Bradley 2755-LS7-SB User Manual

When the Mode switch is in the in position, the interface box takes
RS-232 signals (TXD, pin 2, RXD, pin 3) and converts them to
RS-485 levels. The RS-485 levels are present at both the
RS-485/422 (LAN) connector and the 25-pin (host) connector.
Reader RS-232
Note: In this mode the reader must be set up for Multidrop
communications.
Note: The second RS-232 TXD pin (pin 4 of the host connector) is
not available in this mode.
RS-232 and RS-422 Communication (Catalog No. 2755-LS7-IB2)
In this configuration the Mode switch must be in the in position for
proper operation.
he second serial port (aux) is present on pins 2 and 3 of the 25-pin
T
(host) connector. This allows a standard RS-232 cable to connect to
the second serial port.
Reader RS-232

Defaulting the Interface Boxes

Access to the configuration menus of a reader that is in a polled
mode can be forced (without defaulting) by pressing
auxiliary terminal via the auxiliary RS-232 port.
Using the Default Switch on the Interface Box to Default the
Reader
To default the reader with the default switch, insert 16 to 26 gauge
wire (paper clip) into the small hole to the left of the Power switch.
Listen for a series of short beeps. While the beeping is occurring,
insert the wire into the hole again within 3 seconds. A longer beep
should be heard. If not, repeat the process.
Hardware Operation
Host
RS-485
IB1
RS-485 LAN
Aux
RS-232
IB2
RS-422 LAN
from an
[<D>]
Publication 2755-6.9
6–15