Rockwell Automation 2755 AtomScan Bar Code Reader - Manual (Page 100)

6–15 Hardware Operation
Publication 2755-6.9
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 IB1
Host
LAN
RS-485
RS-485
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.
T he second serial port (aux) is present on pins 2 and 3 of the 25-pin
(host) connector. This allows a standard RS-232 cable to connect to
the second serial port.
Reader RS-232 IB2
Aux
LAN
RS-232
RS-422
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
[<D>] from an
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.