Installation and Setup
32
Hardware Reference Manual – DXLink™ Twisted Pair 4K Transmitters/Receivers
Serial Data Transfer and IR Flow Control
IMPORTANT:
The information in this section does not pertain to the 4K HDMI Wallplate TX as the device does not use serial or IR
communication (for information on DXLink Transmitters that are compatible with the DXLink Twisted Pair 4K HDMI Receiver, see the
“DXLink Compatibility Appendix” on page 89).
The illustration in FIG. 19 shows the bidirectional serial data transfer and IR flow control when DXLink Modules are used in Endpoint
Mode with an Enova Digital Media Switcher. The switcher has an integrated NetLinx Central Control Processor which provides native
AMX control at each remote location fed by a DXLink Transmitter or Receiver. Control is sent over twisted pair cable (via the DXLink
ports).
Optional: Wiring DXLink Modules for Serial Data Transfer
The RS-232 (serial) ports are the 3-position screw terminal blocks on the rear of the modules next to the ICS LAN 10/100
connector. Wire these ports to supply serial data along with the associated video and audio signals from a source device (over the
twisted pair cable between the Transmitter Module and the Receiver Module) to a destination device or vice versa from the Receiver
Module to the Transmitter Module. In addition to being directly connected to a device, this port can be connected as an independent
native NetLinx control port from a networked NetLinx Central Controller.
IMPORTANT:
For serial strings to pass through a standalone TX and RX pair (in Extender Mode) without a NetLinx Master acting as
the host, DIP switch #2 Toggle must be set to OFF on each Module.
The RS-232 port labels are relative to the data flow. On the Transmitter Module, data enters the system at the RX label and leaves
the system at the TX label on the Receiver Module (FIG. 20). The flow is reversed from Receiver Module to Transmitter Module.
NOTE:
On all Modules, the RS-232 connector pinout is “TX - RX - Ground.”
To wire the RS-232 (serial) connectors on DXLink Modules for data transfer:
1.
Wire the RS-232 connectors on Modules according to the pinout directly above the connector.
2.
Use the command RXON to enable this port on Transmitter and Receiver Modules (complete Serial SEND_COMMAND
programming information is available on page 56).
Serial Control – Endpoint Mode and SEND_COMMANDs
In Endpoint Mode (Modules connected to a switcher), serial operations are handled by the host providing control of the endpoints.
The Master’s programming specifies where the serial commands are sent (this is handled independently from the routing of the
video signals). For additional information on Endpoint Mode, see page 21. For Serial SEND_COMMANDs, see page 56.
FIG. 19
Serial data transfer and IR flow control
FIG. 20
Wire RS-232 ports for serial data transfer
IR and/or
RS-232
HDMI
HDMI
DXLink
DXLink
IR and/or
RS-232
Enova DGX 1600
DXLink TX
DXLink 4K HDMI RX
RS-232 (serial) connector pinout
TX
D
RX
D
GN
D