Allen-Bradley Series B

Chapter 5
Programming Via Escape Sequences
5–23
The decoder has the capability to have the flow of the data transmitted to the
host computer paced by an XON/XOFF protocol.
Whenever this pacing protocol is enabled, the decoder will stop transmission
of data to the host whenever it receives an XOFF character. Transmission
will resume after reception of an XON character. When pacing is disabled,
the decoder will ignore these characters.
XON/XOFF Pacing Syntax
Esc – y <n> X
n
Function
0*
1
Disable XON/XOFF Pacing
Enable XON/XOFF Pacing
Values of n: 0, 1
* Default
The default value of <n> is 0, pacing disabled.
XON/XOFF Example 1
Enable XON/XOFF pacing by sending
Esc – y 1 X
XON/XOFF Example 2
Disable XON/XOFF pacing by sending
Esc – y 0 X
The decoder supports a single read mode that allows the host computer to
cue the decoder for a single decode.
Single Read Mode Operation
Single read mode places the decoder into a mode whereby a single bar code
symbol may be read only after an Enable Next Read command has been
received by the decoder. This allows the software in the host computer to
control when bar code data is entered into the system.
When Single Read Mode is enabled, bar code symbols will not be decoded
until the Enable Next Read (Esc – y 1 K) escape sequence is sent from the
host to the decoder.
Single Read Mode Syntax
Esc – y <n> J
n
Function
0*
1
Single Read Mode Disabled
Single Read Mode Enabled
Values of n: 0, 1
* Default
The default value of <n> is 0, Single Read Mode Disabled.
XON/XOFF Pacing
Esc – y <n> X
Single Read Mode
Esc – y <n> J