Gearmo GM-1011-B RS-232 Serial Interface Photoelectric User Manual
- June 5, 2024
- Gearmo
Table of Contents
Gearmo GM-1011-B RS-232 Serial Interface Photoelectric
Summary
With adoption of advanced photoelectric isolation technology, G M – 1 0 1 1 – B 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, various of surges, lighting induction, static interference， hot plug, electromagnetic interference, etc. For example, if device Ais connected to device B with RS-232 interface, when there is a voltage margin of above 50Vbetween 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 tw0 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 ofthe communication system are achieved. Our GM-1011-B products are now being widely used in the applications of point-to-point RS-232 communication system, UNIXX multi-user system, monitor control system, program control exchanger charging terminal, satellite receiver, ATM autoteller machine etc for the industries of electricity, insurance, telecommunications, railway, post office, financial, banking,s ecurities, program controlling, etc.
Technical parameters
- 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: 63mm33mm17mm
- Weight: 30g
- Working environments: -40 degrees to 85 degrees , relative
Connector and signal
Pin distribution at RS-232 DTE end
DB9 Female (PIN)| RS-232C
Interface Signal
---|---
1| Empty
2| Signal out SOUT(TXD)
3| Signal in SIN(RXD)
4| Empty
5| Signal grounding GND
6| Empty
7| Empty
8| Empty
9| Ring indication RI
Pin distribution at RS-232 DCE end
DB9 Female (PIN)| RS-232C
Interface Signal
---|---
1| Protection grounding cable
2| Signal in SIN(RXD)
3| Signal out SOUT(TXD)
4| Data terminal readyDTR
5| Signal grounding GND
6| Data device readyDSR
7| Request sendingRTS
8| Clear sendingCTS
9| Ring indicationRI
Connector and signal
Conforming to EIARS-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.
Connection method
GM-1011 – B 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, MODEMand 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 your GM-1 0 1 1 – B is connected.
Application areas
- Various kind 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 ATMautomatic teller machines connected with
- RS-232 devices without pubic grounding.
- Protection of MODEMand routers.