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

Appendix C— Communications Reference

XON/XOFF, No Status Protocol

Polling Mode D

Multi-Drop Protocol

User-Defined Protocol

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When you switch the printer online (and the input buffer is empty), pin
11/20 becomes "Ready" and it transmits a DC1.
Printer XON/XOFF Operation
# of Bytes Received
Do not care
768
768 + each 15 thereafter
Buffer Empty
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 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).
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.
The printer provides the capability to change protocol characters.
However, users may not define their own protocol. You can substitute
characters you want to use as protocol characters, but the rules for the
chosen protocol do not change. The printer does not use any protocol
characters that you replace with the NUL character. One table of protocol
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Helvetica CondensedHelvetica
Online/Offline Pin 11/20
Offline Busy
Online Busy
Online Busy
Online Ready
EasyCoder 3400e Bar Code Label Printer User's Manual
Transmit
DC3
DC3
DC1 (if DC3 was sent)