Ir Protocol; Optical (Infrared) Interface; Direct-Connect Interface - Symbol PDT 1100 Product Reference Manual

PDT 1100 Product Reference Guide

IR Protocol

The IR protocol is the communications procedure for the serial infrared link, used to
transmit files between the PDT 1100 and a host (or between PDT 1100s). It adopts the
ACK/NAK response method. The IR protocol can also be used for communications through
the direct-connect interface. The IR protocol is composed of a defined set of the control
character sequences including the following three phases:
t Phase 1: Establishment of data link - the sending station confirms that the receiving
station is ready to receive data.
t Phase 2: Data transmission - the sending station transmits data to the target
receiving station.
t Phase 3: Release of data link - the sending station confirms that transmitted data
has been correctly received by the receiving station. If yes, the sending station
terminates the data transmission and releases the data link.
This section lists the specifications for the optical interface and the direct-connect interface
and describes the pin assignment.

Optical (Infrared) Interface

• Synchronization: Start-stop
• Input signals: RD
• Output signals: SD
• Transmission speed: 115200 bps max.

Direct-connect Interface

• Synchronization: Start-stop
• Transmission speed: 38400 bps max.
• Signal level: Conforms to the RS-232C interface
• Pin assignment: See
A-8
Figure
SG or GND
RD
SD
Figure A-5. Pin Assignment
A-5.
35864048.eps