Rs-232C Options; Baud Rate; Parity - Symbol LS 1220 Product Reference Manual

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:
2. Host:
3. Host:
4. Scanner:
5. Host:
6. Scanner:
7. Host:
8-12
Assert RTS (assuming CTS is initially negated)
Assert CTS
Send ENQ
Send Data
Send ACK
Negate RTS
Negate CTS