
8-12
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
Содержание LS 1220
Страница 2: ...LS 1220 Product Reference Guide ...
Страница 3: ......
Страница 4: ...LS 1220 Product Reference Guide 70 12072 03 Revision A January 2003 ...
Страница 23: ...1 8 LS 1220 Product Reference Guide Figure 1 3 LS 1220 Connector ...
Страница 33: ...2 10 LS 1220 Product Reference Guide ...
Страница 71: ...8 14 LS 1220 Product Reference Guide Figure 8 1 Hardware Handshaking ...
Страница 97: ...9 6 LS 1220 Product Reference Guide Code Lengths cont d 1 2 3 4 5 6 7 8 9 0 CANCEL ...
Страница 105: ...9 14 LS 1220 Product Reference Guide Prefix Suffix Values cont d 1 2 3 4 5 6 7 8 9 0 CANCEL ...
Страница 108: ...9 17 Parameter Menus UPC Security Zone cont d 1 2 3 4 5 6 7 8 9 0 CANCEL ...
Страница 114: ...9 23 Parameter Menus Parity Set the type of parity for RS 232C transmission ODD EVEN MARK SPACE NONE ...
Страница 118: ...9 27 Parameter Menus ASCII Data Format Select either 7 bit or 8 bit ASCII format for RS 232C communications 7 BIT 8 BIT ...
Страница 120: ...9 29 Parameter Menus Intercharacter Delay cont d 1 2 3 4 5 6 7 8 9 0 CANCEL ...
Страница 133: ......
Страница 134: ......