Rockwell Automation 2755 Cordless Hand-Held Scanner - Manual (Page 54)

Configuring Your Scanner 3–17
Publication 2755-6.3
Parity
Checks to ensure that the correct number of bits are contained in the
coded character. You can set the parity of each ASCII coded
character that is transmitted. Make sure the parity matches the
requirements of the host. The selections are:
•
Odd
•
Even
•
Mark (parity bit always set to 1)
•
Space (parity bit always set to 0)
•
None (Default)
Check Parity
When enabled, the scanner checks the received characters for parity.
The type of parity can be selected with the Parity parameter. The
default parameter is Check Parity enabled.
Hardware Handshaking
When enabled, handshaking verifies the readiness of a receiving
device before data is transmitted. If the receiving device is
periodically occupied with other tasks, hardware handshaking is used
to prevent loss of transmitted data. You can enable or disable the
hardware handshaking lines, RTS (Request to Send), and CTS (Clear
to Send). The DTR (Data Terminal Ready) signal is active high.
Hardware handshaking cannot be used in conjunction with software
handshaking.
If RTS/CTS handshaking is enabled, the sequence for scanning data
is:
1. The base/charger unit checks the Clear to Send (CTS) line. If
CTS is active, the base/charger unit will wait for up to one second
and check the line again. If the line is still active, the
base/charger unit will provide an audible beep and any scanned
data will be lost.