15Chapter 2. Getting Started the BHT and System Mode2.2 Components and Functions* The trigger switch function is assigned to both of the M3 and M4 keys by default.Indicator LEDIlluminates in green when the BHT hassuccessfully read the bar code.Liquid crystal display (LCD)Shows the characters andgraphic patterns.Trigger switch (M3 key)*Press this switch to startbar-code reading.Optical interface portUsed to exchange data/programs with the hostcomputer via its integrated IRport or via the opticalcommunication unit CU-7000.Hand strapBe sure to put your handthrough this strap toprevent you from droppingthe BHT accidentally.AlphanumerickeysTrigger switch (M4 key)*Press this switch to startbar-code reading.Release buttonPress this button to remove the battery cartridge.Rechargeablebattery cartridgeMain powersource of theBHT.Bar-code reading windowBuilt-in antenna (BHT-7500S/7500W only)Do not cover this antennasection with metal-evaporated tape or byhand. Doing so mayresult in communicationsfailure.Connector coverInside this cover is the direct-connect interface port.When connecting or disconnecting the direct-connectinterface cable to/from the BHT, do not plug or unplugit at an angle and do not pull the cable strongly.Doing so will result in a machine failure.
