Hardware Handshaking; None - Motorola Symbol LS9208 Product Reference Manual

6 - 12 Symbol LS9208/LS9208i Product Reference Guide

Hardware Handshaking

The data interface consists of an RS-232 port designed to operate either with or without the hardware handshaking
lines Request to Send (RTS) and Clear to Send (CTS).
If Standard RTS/CTS handshaking is not selected, scan data transmits as it becomes available. Select Standard
RTS/CTS handshaking to transmit scan data according to the following sequence:
•
The scanner reads the CTS line for activity. If CTS is asserted, the scanner waits up to 2 seconds for the host
to negate the CTS line. If, after 2 seconds (default), the CTS line is still asserted, the scanner sounds a
transmit error, and any scanned data is lost.
•
When the CTS line is negated, the scanner asserts the RTS line and waits up to 2 seconds for the host to
assert CTS. When the host asserts CTS, data is transmitted. If, after 2 seconds (default), the CTS line is not
asserted, the scanner sounds a transmit error, and discards the data.
•
When data transmission completes, the scanner negates RTS 10 msec after sending the last character.
•
The host responds by negating CTS. The scanner checks for a negated CTS upon the next data
transmission.
During data transmission, the CTS line should be asserted. If CTS is deasserted for more than 50 ms between
characters, the transmission aborts, the scanner sounds a transmission error and discards the data.
If this communications sequence fails, the scanner issues an error indication. In this case, the data is lost and must
be rescanned.
If hardware handshaking and software handshaking are both enabled, hardware handshaking takes precedence.
NOTE The DTR signal is jumpered to the active state.

None

Scan this bar code to disable hardware handshaking.
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