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LS 1220 Product Reference Guide
RS-232C Options
Baud Rate
Baud rate is the number of bits of data transmitted per second. The scanner’s baud rate
setting must match the baud rate setting of the host device. If not, data may not reach the
host device or may reach it in distorted form.
Parity
A parity check bit is the most significant bit of each ASCII coded character. If ODD parity is
selected, the parity bit has a value 0 or 1, based on data, to ensure that an odd number of
1 bits are contained in the coded character.
If EVEN parity is selected, the parity bit has a value 0 or 1, to ensure that an even number
of 1 bits are contained in the coded character. Select MARK parity and the parity bit is
always 1. Select SPACE parity and the parity bit is always 0. Select the parity type
according to host device requirements.
If NONE is selected, no parity bits are transmitted.
Handshaking
Hardware and Software Handshaking can be enabled at the same time. When they are,
Hardware Handshaking becomes the outermost layer of the communication. The next layer
is the ENQ, followed by the ACK/NAK layer. These protocols are explained on the following
pages. A typical communication sequence looks like this:
1.
Scanner:
Assert RTS (assuming CTS is initially negated)
2.
Host:
Assert CTS
3.
Host:
Send ENQ
4.
Scanner:
Send Data
5.
Host:
Send ACK
6.
Scanner:
Negate RTS
7.
Host:
Negate CTS
Summary of Contents for LS 1220
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Page 4: ...LS 1220 Product Reference Guide 70 12072 03 Revision A January 2003 ...
Page 23: ...1 8 LS 1220 Product Reference Guide Figure 1 3 LS 1220 Connector ...
Page 33: ...2 10 LS 1220 Product Reference Guide ...
Page 71: ...8 14 LS 1220 Product Reference Guide Figure 8 1 Hardware Handshaking ...
Page 97: ...9 6 LS 1220 Product Reference Guide Code Lengths cont d 1 2 3 4 5 6 7 8 9 0 CANCEL ...
Page 105: ...9 14 LS 1220 Product Reference Guide Prefix Suffix Values cont d 1 2 3 4 5 6 7 8 9 0 CANCEL ...
Page 108: ...9 17 Parameter Menus UPC Security Zone cont d 1 2 3 4 5 6 7 8 9 0 CANCEL ...
Page 120: ...9 29 Parameter Menus Intercharacter Delay cont d 1 2 3 4 5 6 7 8 9 0 CANCEL ...
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