Omega Speaker Systems iLD Series 사용자 설명서

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The iLD Big Display controller/monitor with the Embedded Ethernet Server option board
support only RS485/422 interfaces. These standards define the electrical characteristics
of a communication network. The RS485 port of the Ethernet Server is fully compatible
for use with RS422 instruments. The RS485 is an extended version of the RS422
communication standard which increases the allowable number of devices from 10 to
32 by improving the electrical characteristics.

• The RS485 standard (multi-point) allows one or more devices (multi-dropped) to be 

connected to the Ethernet Server using a two-wire connection (half-duplex) +Rx/+Tx 
and –Rx/-Tx. Use of RS485 communications allows up to 32 devices to connect to the
Web Server with cable length up to 4000 feet long.

Although the RS485 is commonly referred to as a "two wire" connection, the 
Web Server also provides a ground/return shield connection to use as a
common connection for EMI noise protection.

Table 2.2 shows some characteristics of the RS485 communication interface.

Transmission Mode

Differential

Electrical connections

2 wire

Drivers per line

32 drivers

Receivers per line

32 receiver

Maximum data rate

10M bits/s

Maximum cable length

4000 ft (1200 meters)