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3.4
Communication connection
Overview
•
RS232/422 IN/OUT Serial network
•
Ethernet connection
•
Hardwired remote to CTRL 1
•
Bi-directional communication port, CTRL 3
3.4.1
RS232/422 IN/OUT Serial network
RS232
An Electronic Industries Association (EIA) serial digital interface standard specifying the characteristics of the commu-
nication path between two devices using either D-SUB 9 pins or D-SUB 25 pins connectors. This standard is used for
relatively short-range communications and does not specify balanced control lines. RS-232 is a serial control standard
with a set number of conductors, data rate, word length and type of connector to be used. The standard specifies com-
ponent connection standards with regard to computer interface. It is also called RS-232-C, which is the third version
of the RS-232 standard, and is functionally identical to the CCITT V.24 standard. Logical '0' is > + 3V, Logical '1' is < -
3V. The range between -3V and +3V is the transition zone.
RS422
An EIA serial digital interface standard that specifies the electrical characteristics of balanced (differential) voltage,
digital interface circuits. This standard is usable over longer distances than RS-232. This signal governs the asyn-
chronous transmission of computer data at speeds of up to 920,000 bits per second. It is also used as the serial port
standard for Macintosh computers. When the difference between the 2 lines is < - 0.2V that equals with a logical '0'.
When the difference is > +0.2V that equals to a logical '1'..
Application
1.
Remote control:
-
easy adjustment of projector via a computer.
-
allow storage of multiple projector configurations.
-
wide range of control possibilities.
2.
data communication
Pin configuration
Image 3-19
RS232/RS422 serial network connection
RS232/422 Serial Network IN
1
Data Carrier Detect (CD)
2 RXC-
Receive Data (RD or RX or RXD)
3 TXC-
Transmitted Data (TD or TX or TXD)
4TXC+
Data Terminal Ready (DTR)
5 GND
Signal Ground (GND)
RS232/422 Serial Network OUT
-
1
2 RXB-
Receive Data (RD or RX or RXD)
3 TXB-
Transmitted Data (TD or TX or TXD)
R5976690 XLM H25 25/05/2009
BI-DIRECT IO NAL
UNI-DIRECTIO NAL
PUSH
PUSH
2
1
2
1
3
3
PORT 2
CTRL 3
CTRL 2
CTRL 1
PORT 1
HARDWIRED REMOTE
10/100 BASE T
WIRELESS REMOTE
MONITOR OUT
RS232/422 IN
RS232/422 OUT
MONITOR OUT
SERIAL NETWORK
6 RXC+
Data Set Ready (DSR)
7
Request to send (RTS)
8
Clear To Send (CTS)
9
Ring Indicator (RI)
-
6 RXB+
Data Set Ready (DSR)
-
7
-
8
3. Connections
31
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