Lightware HDMI-OPT-RX100, User Manual, Page: 23 / 60

HDMI-OPT-TX and RX family
User’s Manual
Section 4. Installation and operation Page 23 / 60
4.2. Connecting serial devices
4.2.1. General information about serial communication
There are two type of devices in general serial communication:

Data Terminal Equipment
– Data Terminal Equipment (DTE) is an end instrument that
converts user information into signals or reconverts received signals.
Typical DTE devices: computers, LCD touch panels and control
systems.

Data Circuit-terminating Equipment
–
Data Circuit-terminating Equipment (DCE) is a
device that sits between the DTE and a data transmission circuit. It
also called data communication equipment and data carrier
equipment. Typical DCE devices: projectors, industrial monitors and
amplifiers.
Among others the pin assignment is different between DTE and DCE.
DTE DCE
Pin 2: RD TD
Pin 3: TD RD
RD: Received Data (digital input)
TD: Transmitted Data (digital output)
Info: HDMI-OPT transmitters (TX200R, TX100R) are DCE units and receivers (RX200R,
RX100R) are DTE units according to their pin-out.
Different type of serial cables must be used between different serial devices.
DTE DCE
DTE Null-modem Straight
DCE
Straight Null-modem*
* in general contact DCE with DCE by tail-circuit serial cable.
4.2.2. Type of serial cables

Straight serial cable
–
straight pin-outs both ends

Null-modem serial cable
–
straight pin-out at the one end and cross pin-out at the other
end. (Interchange lines of TX and RX). For the detailed pin-outs see
section
3.13.2.
Serial cables between devices may have male or female plugs and their type may be
straight or null-modem in usual.
Info The cable type does not depend on the plug type.