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XON and XOFF signals are always transmitted independently and are not inside
any part of the message, including the byte count, status bytes, or user data. When
a message includes optional user data, the byte count (bytes 1 and 2) can include
X'10', X'11', or X'13'. When X'10', X'11', or X'13' occur in transparent XON/XOFF
mode, the byte count is bit-exclusive-ORed with X'21' and is prefixed by the DLE
(X'10') character to become:
Value in message Becomes
X'10' X'1031'
X'11' X'1030'
X'13' X'1032'
User data with X'10', X'11', or X'13' is also treated this way in transparent
XON/XOFF mode. The byte count is not incremented for such extra characters.
Determining XON/XOFF control: You can determine whether or not XON/XOFF
control is being used by sending the extended address command and checking bit
3 of the feature byte. If this bit is set, the printer is in XON/XOFF mode. (See
“Extended address command-request printer ID” on page 112.)
Disabling XON/XOFF transparent mode: You can disable transparent
XON/XOFF mode as described in “Real-time requests” on page 175. When
disabled, X'10', X'11', or X'13' can occur within messages. The values are not
bit-exclusive-ORed with X'21' because no transform occurs for such values within
messages as it does during transparent XON/XOFF mode.
Note: Disabling XON/XOFF transparent mode should be done with Model TI4 only.
It is not recommended with Model TI8.
USB communication mode
No switches or special commands are required for USB communication. With the
USB interface card and cables in place, the system automatically detects the printer
when it is attached and performs any necessary setup. The printer operates at data
rates up to 12 Mbps.
USB selection
USB is an industry standard communication interface. It is used to attach devices
such as printers, displays, and keyboards to personal computers or to IBM POS
systems that have USB ports. The standard USB port (with a power brick) is used
to attach the SureMark to personal computers. The powered USB port is used to
attach the SureMark to IBM POS systems. See Figure 9 on page 21 for the
thermal/impact SureMark printers and Figure 10 on page 22 for the single-station
SureMark printers.
Updated April 2, 2009
Chapter 2. Installation instructions 31