Serial Devices; General Information About Serial Communication; Example Connection Diagrams - Lightware MODEX-OPTS-TX User Manual

Step 8. Optionally for USB HID extension
Step 9. Power on the devices using the power cables.

5.2. Serial devices

5.2.1. General information about serial communication

There are two kind of devices in general serial communication from our aspect:
Data Terminal Equipment (DTE)
DTE is an end-instrument that converts user information into signals or reconverts received
signals. Typical DTE devices: computers, LCD touch panels, control systems.
Data Circuit-terminating Equipment (DCE)
DCE is 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 and different type of
serial cables have to be used between the serial devices.
Legend: RD=Received data; TD=Transmitted data
Serial cable types

5.2.2. Example connection diagrams

Following cases are examples; devices may have different receptacles and pin-outs.
1
Mentioned devices are examples and can be connected to either transmitter or receiver
Section 5. Installation

Connect at least one USB HID device to the receiver. Use the keyboard
the mouse labelled USB-A connectors.

Connect the transmitter to the computer by the USB-B cable.
DTE
Pin2
RD
Pin3 TD
Table 5-1. Pin assignments and applicable serial cables
Straight serial cable
Straight pin-outs on both ends
Figure 5-2. Extending RS-232 between computer (DTE) and projector (DCE)
1
:
DCE
DTE
TD
RD 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)
Table 5-2. Serial cable types
MODEX-OPTS, MODEX-OPTM
User's Manual
DTE DCE
Null-modem Straight
Straight Null-modem
Page 27 / 90
and