Motorola SYMBOL LS9203 - Manual (Page 117)

RS-232 Interface 6-25
Host Serial Response Time-out
This parameter specifies how long the scanner waits for an ACK, NAK, or CTS before determining that a transmission error has
occurred. This only applies when in one of the ACK/NAK Software Handshaking modes, or RTS/CTS Hardware Handshaking option.
*
Minimum: 2 Sec
Low: 2.5 Sec