Rs485 Specifications; Environmental Specifications - Telenetics MIU Dial or Leased Line modem with RS-485 Installation & Operation Manual

5.

RS485 SPECIFICATIONS

MIUXXXX/485 are low-power Transceiver for RS485 and RS422 communication
Features: Point to Point or Multidrop/Multipolling
impedance
caused
transmitted
lengths
the
Typical Speed versus Distance - (4-wire point to point 26 AWG twisted
NOTE: Speed and distances will depend on actual operating
environment.

6. ENVIRONMENTAL SPECIFICATIONS

The CIU/485 (MIUXXX\485) meets the following environmental specifications.
Install Op and Diags for MIU Modems and RS485 (0049-0002-010A)
Full or Half Duplex
Drivers are short - circuit current limited & protected against excessive
power
dissipation (shutdown will places the drivers in a high - impedance state).
When Drivers are disabled (by TXD),
state.
Note in two-wire or multi-drop/multi-polling networks TX enable by TXD
should be active
Receiver input impedance is 12K ohms.
Reduced slew- rate drivers that minimize EMI and reduce reflections
by improperly terminated cables
data up to 200Kbps
RS485/RS422 standard covers line lengths up to 4000 feet. For line
greater than 4000 feet a line repeater can be added.
MIUXXXX/485 can drive 4000 feet of 26AWG twisted - pair cable at
200k bps into 120 ohms load.
To minimize reflections, the line should be terminated at both ends. In
multi - polling/multi - drop environments (up to 32 drops) all drops off
main cable should be as short as possible.
Only the Master/Host unit and the end of cable unit should be terminated.
SPEED
1200bps
2400 bps
4800 bps
9600 bps
19,200 bps
38,400 bps
56,400 bps
115,000 bps
drivers will switch to high
This will allow error - free
cable)
DISTANCE
6.0 miles(9.6 km)
4.5 miles (7.2 km)
4.0 miles (5.5 km)
2.5 miles (4.0 km)
1.8 miles (2.9 km)
1.4 miles (2.1 km)
1.1 miles (1.8 km)
0.6 miles (0.9 km)
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