Serial Management; General Information; Types Of Serial Cables; Signal Transmission Over Mx2-Hdmi20 Matrix Switchers - Lightware MX2-4x4-HDMI20-CA User Manual

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12. Technologies
12.4. Serial Management
12.4.1. General Information
There are two types of devices in general serial communication:
Data Terminal Equipment: Data Terminal Equipment (DTE) is an end instrument that converts user
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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
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between the DTE and a data transmission circuit. It is 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.
RD: Received Data (digital input)
TD: Transmitted Data (digital output)
Different type of serial cables must be used between different serial devices.
* In general contact DCE with DCE by tail-circuit serial cable.
12.4.2. Types of Serial Cables
Straight Serial Cable
Straight pin-outs both ends.
Serial cables between devices may have male or female plugs and their type may be straight or null-modem
in usual.
ATTENTION! The cable type does not depend on the plug type.
DTE DCE
RD TD
Pin 2:
TD RD
Pin 3:
DTE DCE
Null-modem Straight
DTE
Straight Null-modem *
DCE
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).
MX2-HDMI20 series – User's Manual
12.4.3. RS-232 Signal Transmission over MX2-HDMI20 Matrix switchers
The following examples describe the detailed integration of Lightware devices between different RS-232 pin
assignment units.
INFO: -R suffixed models in MX2-HDMI20 series are supplied with D-SUB serial connector. These models are DCE
units (according to their pinouts) with female plugs.
Extending RS-232 between DTE and DCE Third-party Devices
Connect straight serial cable between controller system (DTE) and the matrix (DCE).
Extending RS-232 between DTE and DTE Third-party Devices
Connect a null-modem serial cable between a projector (DCE) an a matrix (DCE).
Applied firmware package: v1.7.0 | LDC software: v2.5.1b5
RS-232 Connection Example between a Controller System and a Matrix Switcher
RS-232 Connection Example between a Projector and a Matrix Switcher
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