VISTEK V1679 Скачать руководство пользователя страница 11 | Manualshive

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VISTEK V1679 Скачать руководство пользователя страница 11

VISTEK V1679 single-mode fibre
data transceiver

HU-V1679

11

3.3.2

N-Channel MOSFET Switch

The mechanical switch shown in the previous example can easily be replaced by an N-Channel MOSFET
Switch, as illustrated in the diagram below. Using a FET not only eliminates possible bouncing problems,
which are common to most mechanical switches, it also allows much faster switching cycles. A bounce-free
output is subject to a 'clean' control signal applied at the FET's Gate input.

100R

390R

1K8

GPIOn-

GPIOn+

+5V

+12V

1N4148

Input Bias Voltage Selection Jumper

Short to GND Jumper

(short)

On-board power supplies

Note:

The LED is permanently 'ON' as long as the FET is switched off.
By applying a positive voltage between Gate and Source, higher than the FET's
Gate-Source Threshold voltage V

GS(th),

the FET becomes conductive and the LED

goes 'OFF'. The maximum Drain current I

D

is less than 7m A.

Rear Connector Side

Board Side

G

D

S

Figure 5 : Example 2

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Содержание V1679

Страница 1: ...1 VISTEK V1679 SINGLE MODE FIBRE DATA TRANSCEIVER USER GUIDE www pro bel com...

Страница 2: ...5 4 2 Configuration Options 16 4 2 1 RS 232 422 Mode Selection Jumper 17 4 2 2 Slew rate Selection Jumper Slow Fast 17 4 2 3 Line Termination Jumper RS 422 Only 17 4 3 RS 232 422 Examples 18 5 REAR PA...

Страница 3: ...VISTEK V1679 single mode fibre data transceiver HU V1679 3 7 DART INTERFACE 28 7 1 General 28 7 2 DART Control Registers 28 7 3 DART Status Registers 29 8 BLOCK DIAGRAM 30 9 CLEANING INSTRUCTIONS 31...

Страница 4: ...t exceed 0 dBm 1mW under normal operating conditions Unused optical outputs are automatically covered with a shutter and prevent direct exposure to the laser beam Even though the power of these lasers...

Страница 5: ...ts can be monitored by DART V1679 OP Provides 16 General Purpose Outputs with the choice of 8 Outputs to be either driven externally i e driven through a corresponding signal sent from the remote site...

Страница 6: ...Input or locally via DART The polarity of the received control bit for any given output is application dependent hence an unambiguous relationship between input and output polarities doesn t exist One...

Страница 7: ...ts V1679 IO 8 Earth free dry contact Relay switches V1679 OP 16 Earth free dry contact Relay switches Contact configuration Normally Open NO or Normally Closed NC Contact material Ag Au Clad Contact r...

Страница 8: ...evel buffer with a current sinking sourcing capability of as low as 4mA Extra series resistors might be required when using a voltage source of 7V in order to limit the forward current of the Emitter...

Страница 9: ...biased input pins By applying Ohm s law the forward current IF through the LED can be calculated as follows 100 1N4148 F LED F IN F V V V I Considering the worst case scenario by taking VF LED min an...

Страница 10: ...it at the far end of the fibre link is unstable for the same period of time The built in Schmitt Trigger Buffer in the Opto Isolator can only tidy up slow rising edges but it cannot suppress heavily b...

Страница 11: ...switching cycles A bounce free output is subject to a clean control signal applied at the FET s Gate input 100R 390R 1K8 GPIOn GPIOn 5V 12V 1N4148 Input Bias Voltage Selection Jumper Short to GND Jump...

Страница 12: ...mally specified as IC or CollectorCurrent The Transistor must withstand at least 12V minus the voltage drop across the diodes to be precise in the off state normally specified as VCE or Collector Emit...

Страница 13: ...e rie s re s is to r is re q u ire d in o rd e r to lim it th e c u rre n t th ro u g h th e C M O S B u ffe r to c o m p ly w ith its s p e c ific a tio n N o te th a t th e B u ffe r s o u tp u t v...

Страница 14: ...ator Rating TA 25 C Emitter LED Continuous Forward Current 60mA Input Forward Voltage VF IF 10mA 1 2V typ 1 5V max IF 0 3mA 0 75V min 1 0V typ Turn On Threshold Current IF on 1 6mA max Turn Off Thresh...

Страница 15: ...rate and an optional line termination RS 422 only can be configured by setting Jumpers accordingly Data transfer rates of up to 1Mbps in RS 232 mode and 10Mbps in RS 422 mode can be achieved The trans...

Страница 16: ...election Jumper RS 232 422 Transceiver Slow COM1 Fast RS232 RS422 RS 232 422 Transceiver Slow COM2 Fast RS232 RS422 Term Term RS422 only RS 232 422 selection Jumper 120Ohm Termination Jumper COM2 exam...

Страница 17: ...t two control lines DSR DTR are actually borrowed from COM2 In this mode COM2 can only operate as RS 232 with RxD TxD lines only Factory default setting is RS 232 for COM1 and COM2 4 2 2 Slew rate Sel...

Страница 18: ...a so called Null Modem cable RxD TxD CTS RTS and DSR DTR signals crossed over is required for the connection between the PC s Serial Port and the V1679 at the far end If the Serial PC Mouse is equippe...

Страница 19: ...iplexing two distinct laser wavelengths V1679 xx V1679 xx COM1 COM2 DART Dongle RS 232 CAN up to 60kmsingle mode fibre GPIO V1606 Rack Local Site V1605 Control Panel CAN V1606 Rack Remote Site COM1 CO...

Страница 20: ...control room V1679 xx V1679 xx COM1 COM2 RS 422 up to 50kmsingle mode fibre GPIO COM1 COM2 GPIO Laser Tx Laser Tx PIN TIA Rx PIN TIA Rx Up to 16 GPIO s Up to 16 GPIO s RS 422 Camera Control Example us...

Страница 21: ...C T C L A S S 1 T x R x F ib re D ata V 1 6 7 9 Figure 12 V1679 Rear Panel 5 1 Silkscreen Legend and Markings Optical Output Transmitter Optical Input Receiver GPI Connector GPI COMMS I O A label at t...

Страница 22: ..._Tx2 RS232 RTS RS422 Tx 3 COM1_Rx1 RS232 CTS RS422 Rx 18 GND 33 COM2_Tx1 RS232 TxD RS422 Tx 4 GPIO_N16 Group B 19 COM1_Tx2 RS232 RTS RS422 Tx 34 GND 5 GPIO_P16 Group B 20 COM1_Tx1 RS232 TxD RS422 Tx 3...

Страница 23: ...r a RxD TxD only communication over COM2 where either no flow control is required or a software flow control Xon Xoff is used instead 5 3 V1679 Breakout Adapter Vistek offers a special Breakout Adapte...

Страница 24: ...11mm 5 3 3 Power Supply Output The V1679 Breakout Adapter features a power supply output which delivers unregulated 15V 1A fused on a 3 way PHOENIX Header with 3 5mm pitch MCV1 5 3 G 3 5 5 4 Optical...

Страница 25: ...ectable options Medium 7dBm typ High 3dBm typ Note Output Power may vary by 1dBm Extinction Ratio 8dB typ Fibre Type Single mode 9 125 m Transmission Length up to 70 km 1550nm 622Mb s CORNING SMF 28 s...

Страница 26: ...6 1 1 Remote Control Access and Power Indicators The green V LED is lit when the unit s on board power supply is delivering voltage The yellow REM LED indicates with short blinks that the unit is acc...

Страница 27: ...nsmitter is good LED Red Laser Diode Failure Diode has reached end of life or ambient temperature is too high 70 C and the Laser has shut down automatically 6 1 3 Serial Comms Activity Indicators The...

Страница 28: ...1 Set 13 DART driven GPI Input6 0 Reset 1 Set 14 DART driven GPI Input7 0 Reset 1 Set 15 DART driven GPI Input8 0 Reset 1 Set 16 Mask Bit for GPI I O1 0 ext controlled 1 DART driven 17 Mask Bit for G...

Страница 29: ...5 State of GPI Input8 State of GPI Input8 State of GPI Output16 16 Mask bit for GPI I O1 Mask bit for GPI Input1 Mask bit for GPI Output1 17 Mask bit for GPI I O2 Mask bit for GPI Input2 Mask bit for...

Страница 30: ...VISTEK V1679 single mode fibre data transceiver 30 Issue 1 8 BLOCK DIAGRAM Figure 15 Single Mode Fibre GPI O and RS 232 422 Transceiver...

Страница 31: ...aturated wipe can be found packed with each board Cleaning Technique Note that pre saturated wipes dry out very quickly and they should be used only once 1 Place the connector ferrule in the wipe and...

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