3820 UG.book - Finn-ID

RS-232 HandshakingRS-232 Handshaking allows control of data transmission from the scanner usingsoftware commands from the host device. CTS/RTS operates in mode 2. Whenthis feature is turned Off, no data flow control is used. When Data Flow Controlis turned On, the host device suspends transmission by sending the XOFFcharacter (DC3, hex 13) to the scanner. To resume transmission, the host sendsthe XON character (DC1, hex 11). Data transmission continues where it left offwhen XOFF was sent. Default = RTS/CTS, XON/XOFF and ACK/NAK Off.RTS/CTS On* RTS/CTS OffXON/XOFF On* XON/OFF OffACK/NAK On* ACK/NAK OffHost ACK SelectionSome applications require that the host terminal (or server) approve or rejectincoming bar code data and notify the operator of these actions. Theseapplications require that the host maintain control over the response indicatorsemitted from the source scanner. Turning the Host ACK selection on, configuresthe cordless system scanners to respond to commands from the host system.The following criteria must be met for the Host ACK to work correctly:• The cordless system must be configured for “Host Port RS-232” (Terminal ID= 000)• RTS/CTS is defaulted off. You must enable it if the host system requires it.• Host ACK must be enabled (page 2-12).• System performance degrades when using Host ACK at rates lower than9600.• The host terminal software must be capable of interpreting the bar code data,make decisions based on the data content, and send out appropriate escapecommands to the source scanner.Escape commands are addressed to the source scanner via “Application WorkGroups.” Once a command is sent, all scanners in a group respond to thatcommand. Because of this situation, it is recommended that each scanner isassigned to its own group in host ACK mode.2020/3820 User’s Guide 2 - 11