Xon/Xoff, No Status Protocol; Polling Mode D; Multi-Drop Protocol - Intermec 3400 User Manual

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This table shows the printer XON/XOFF operation:
# of Bytes Received
Do not care
768
768 + each 15 thereafter
Buffer Empty

XON/XOFF, No Status Protocol

This protocol is identical to XON/XOFF protocol except that status is not
returned after each message received. However, status is still returned for the
status request (<ENQ>) and the status dump (<VT>) commands.

Polling Mode D

Polling Mode D is a block transfer protocol that transmits data in blocks of up
to 255 characters, including protocol overhead. For Polling Mode D, the
host/concentrator is responsible for asking the printer for data it might have
(polling) and requesting to send data to the printer (selecting). The blocks are
framed with LRC characters for additional data integrity. Polling Mode D is
normally used for point-to-point networks that connect the printer to an
Intermec port concentrator (RS-232 or RS-422 are acceptable).
This protocol is the default setting for the printer. Return the protocol setting to
Polling Mode D by setting the printer DIP switches to the factory default
settings (9600, E, 7, 1).

Multi-Drop Protocol

Use Multi-Drop protocol to connect up to 32 devices to an Intermec controller
on a four-wire RS-485 (two twisted pair). This protocol is similar to Polling
Mode D except each device has a unique address (POL and SEL character). You
must use an RS-485, which is automatically enabled when you enable
Multi-Drop. Be sure to specify a unique address for the printer and verify that
the baud rate is between 2,400 and 19,200.
C o d e 39
Communications Reference
Online/Offline Pin 11/20
Offline Busy
Online Busy
Online Busy
Online Ready
C
Transmit
DC3
DC3
DC1 (if DC3 was sent)
C-5