15
Digital Telephone Hybrid
Rio Rancho, NM – USA
SERIAL PORT HARDWARE AND SOFTWARE
Serial Port Hardware Connection
The serial port on the TH3 is a minimal RS-232 implementation. The figure shows the wiring diagram to accommo-
date interconnection with either a 9- or a 25-pin serial port on a PC or other serial device.
Wiring Diagram, 9 Pin D-Sub
LecNet Device to PC
3.5MM
Stereo Plug
9 or 25 Pin Female
D-Subminiature
S
R
T
1
2
3
4
5
6
7
8
9
LecNet Port
LecNet Device Transmit
LecNet Device Receive
Gnd
Tip
Ring
Sleeve
Host
Serial
Port
(PC)
N/C
N/C
Wiring Diagram, 25 Pin D-Sub
LecNet Port
LecNet Device Transmit
LecNet Device Receive
Gnd
Tip
Ring
Sleeve
3
2
7
1
4
5
6
20
CD
RX
TX
Gnd
RTS
CTS
RI
RX
TX
Sig Gnd
Chassis Gnd
RTS
CTS
Host
Serial
Port
(PC)
DTR
DSR
DSR
DTR
LecNet Device to AMX or Crestron
LecNet Port
AMX
or
Crestron
Port
1
2
3
4
5
6
7
8
9
LecNet Device Transmit
LecNet Device Receive
Gnd
RXD
TXD
Gnd
Tip
Ring
Sleeve
3.5MM
Stereo Plug
9 Pin Female
D-Subminiature
S
R
T
N/C
N/C
N/C
N/C
N/C
N/C
AMX Programming Notes
If you are using an AMX system to control your LecNet
equipment, you’ll want to purchase the Lectrosonics
PT3 Protocol Translator. The PT3 connects between
the AMX bus and any LecNet equipment. With the
PT3, the LecNet equipment looks just like native AMX
equipment. The PT3 is the fastest and most produc-
tive way to control LecNet devices with an AMX
system.
