SOHARD SH ARC-USB, Руководство пользователя

Страница: 26 / 32

Handbuch / Manual
26
11.1.5 RS-485/EIA-485 Interface (-R)
Data rate
Input threshold
Polarity in idle state
Line termination
DC-Biasing
Differential voltage output
Connector 19.5 kbit/s
– 10 Mbit/s
+/− 200 mV
positive
115 ohm (internal termination disabled
by default)
240 ohm + 5 V / 240 ohm 0 V (biasing
disabled by default)
min. 3.0 V
D-sub DE9F socket, Galvanic insulation
between D-sub pins and shield
11.1.6 RS485AC Interface (-RS485AC-RJ45 / -BNC)
Data rate
Line termination
Output peak voltage
Ouput pulse shape
Cabling
Connector 2.5 Mbit/s
– 10 Mbit/s
– RJ45: 120 ohm
– BNC: 93 ohm
Internal termination disabled by default
2.5 V typ.
Bipolarly alternating rectangular pulses
– RJ45: twisted pair wire with Z = 120
ohm
– BNC: coaxial cable with Z = 93 ohm is
recommended
– RJ45: Shielded RJ45 socket
– BNC: BNC socket
11.1.7 Twisted-pair Interface (-TWP)
Data rate
Bus termination
Output peak voltage
Ouput pulse shape
Cabling
Connector 2.5 Mbit/s
120 ohm (internal termination disabled
by default)
min. 16 V on terminated 120 ohm line
Sine dipulse 200 ns according to
ANSI/ATA 878.1
Twisted pair wire with Z = 120 ohm is
recommended
Shielded RJ45 socket