Hand Held Products IMAGETEAM 3870, System Manual

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Auxiliary Port Communications
Host Commands (IT3875XXX-X2-1 and ST2070-5 only)
Most VersaCode script commands can be sent by RS-232 from the host to a
scanner via the base unit. When the host sends the VersaCode commands,
they are called Host Commands. Host Commands can be used to control every
function of the scanner. For example, Host Commands may be used to put a
text prompt on the scanner’s display or to get input from the scanner or keypad.
Host Commands may be used to notify the operator that scanned data has been
accepted or rejected by putting a picture on the scanner’s display or by sounding
the beeper and lighting the LEDs. In this way, they are much like Host ACK
escape commands ("Host ACK Selection" on page 3-6), only Host Commands
are more powerful.
The following criteria must be met for Host Commands to work correctly:
• The cordless system must be configured for Aux Port RS-232 (Terminal
ID = 000).
• Both the host terminal and the cordless system must have RTS/CTS
handshaking ("Hardware Flow Control Selection" on page 3-4) enabled.
• Host Commands are addressed to an individual scanner using a four-
character Scanner ID.
• The scanner must be expecting the Host Command. This is
accomplished using one of three VersaCode commands resident in the
scanner: WaitForMultiple Commands, WaitForCommand, or
CheckForCommand. For additional information, please refer to the
VersaCode Language Reference User’s Guide.
• Refer to VersaCode Language Reference User’s Guide to determine
which VersaCode commands are available as Host Commands and for
the correct syntax of the commands.
• The host computer must be capable of sending Host Commands by RS-
232 and capable of interpreting the response to each command.
Each scanner responds to only one Host Command at a time. The host receives
a response from the scanner when the command has been processed.