Digitus DA-70163 Bedienungsanleitung
RS-232 SERIAL INTERFACE
PHOTOELECTRIC ISOLATOR
User Manual
DA-70163
I. Summary
With adoption of advanced photoelectric isolation technology, RS-232 Serial Interface
Photoelectric Isolator, also named Serial Isolator, can offer best protection for RS-232 serial
interface devices with elimination of damages possibly caused up by grounding
loop voltage, surge, lighting induction, hot plug, etc.
Normally, RS-232 damages are hardware damages of communication devices, for which
more than 90% of the reasons are bad circumstances including non-grounding at both ends
of the devices, several surges, lighting induction, static interference, hot plug,
electromagnetic interference, etc. For example, if device A is connected to device B with
RS-232 interface, when there is a voltage margin of above 50V between their grounding
wires, the communication will gets unstable. RS-232 Serial Interface Photoelectric Isolator
can tolerate a peak voltage margin of transient 2,500 Vrms for 500VDC on a continuous
base, and at the same time, it is able to absorb static and electromagnetic interference for
protection of RS-232 devices.
As the electric and grounding loop between the two ends of RS-232 devices are completely
blocked by the advanced isolation technology adopted by us, therefore, the electric signal
from one end has been turned into optical signal for transmission to the other end, and the
optical received by the other end will be converted back into electric signal again. In this
way, the communication devices are well protected from the interference and damages
possibly caused by power grounding loop or surge, therefore, obvious improvement of the
reliability and stability of the communication system are achieved.
Our products are now being widely used in the applications of point-to-point RS-232
communication system, UNIX multi-user system, monitor control system, program control
exchanger charging terminal, satellite receiver, ATM etc for the industries of electricity,
insurance, telecommunications, railway, post office, financial, banking, securities, program
controlling, etc.
II. Technical parameters
Interface: conforming to EIA RS-232 and CCITT V2.4 asynchronic protocols
Connector: DB9 connectors for both ends
Transmission mode: Asynchronic, full duplex, full transparent
Isolation voltage: 2,500Vrms impulse or 500 VDC continues
Transmission rate: 300BPS-57, 600BPS
Power: from RS-232 interface (TXD, RTS or DTR)
Measurements: 63*33*17 mm
Weight: 30g
Working environments: -40 degrees to 85 degrees
Relative humidity: 5% to 95%
III. Connector and signal
Pin distribution at RS-232 DTE end
IV Connector and signal
Conforming to EIA RS-232 and CCITT V2.4 standards.2-3 pin for data sending and
receiving, 7-8 pin for RTS and CTS, 4-1 pin for DTR and DCD, 6 pin for DSR and 5 pin for
GND. RS-232 interface (TO DTE): Connector: DB-25/9 hole-shaped connector to be used.
Signal: interior signal cables are separated.
1. Model selection
First of all, you have to get a clear idea of which signal cables are used by your RS-232
system, then you can select the proper model isolator to protect your communication
system. For example, for the terminal of the traditional 2, 3 and 5 lines, you can select the
isolator which supports 3-line-2-cable 1-receive-1-send mode. And for the 5 line terminal of
2, 3, 4, 5 and 7, you can select the isolator which supports 5-line-4-cable 2-receive-2-send
mode.
2. Connection method
RS232 optic isolator can be connected in series with between the serial connection cable of
the previous RS-232 and the RS-232 interface, and either end is OK but you have to pay
attention to the direction indicated by TO DTE or TO DCE. Generally speaking, PC user
and multi-user are DTE devices; MODEM and terminal are DCE devices, however this
general rule dose not apply to all situations. To decide DTE or DCE devices, you have to
base your conclusion on the signal cable of your devices RS-232 interface. For example, it
is DTE for the signal output from DB25 interface pin 2, while its receiving input is DCE.
Therefore, if crossed RS-232 cable is used to connect two DTE devices (e.g. terminal and
multi-users), you have to connect the TO DTE end to the device and TO DCE end to the
cable, no matter which side, and your RS232 optic isolator is connected.
V. Application areas
Various kinds of multi-user systems such as UNIX
Protection of multi-user terminal and host
Protection of satellite receiver
Protection of multi-user cards
Protection of ATM connected with RS-232 devices without pubic grounding
Protection of MODEM and routers
VI. Application diagram
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