Page
Chapter: 1
Section:
CONFIGURATION OF THE DRO MODEL VNP400
8
1.4.1.2 CONNECTOR X5
It is a 9-pin female SUB-D type connector for the RS 232C and probe connection.
The cable shield must be connected to pin 1 of the connector at the DRO end and to the metal
housing at the peripheral end.
SUGGESTIONS FOR THE RS 232C INTERFACE
* Connecting and disconnecting a peripheral
The DRO must be turned off when connecting or disconnecting any peripheral
through connector X5 (RS 232C serial port interface).
* Cable length
The EIA RS232C standard specifies that the cable capacitance must not exceed
2500pF. Therefore, since the usual cables have a capacitance between 130 and 170pF/
meter, the maximum cable length must not exceed 15 meters (50 feet).
It is recommended to use shielded twisted-pair cables in order to minimize interference
which could cause poor quality communications through long cables.
7-conductor cables are also recommended with a section of 0.14mm
2
and overall
shield.
* Ground connection
All control and data signals should be referenced to the same ground cable (pin 7 -
GND-) thus avoiding various points with different voltages since at the ends of long
cables some voltage level differences may occur.
PIN
SIGNAL
FUNCTION
1
2
3
4
5
6
7
8
9
CHASSIS
TxD
RxD
RTS
CTS
DSR
GND
DTR
Shield
Transmit data (output)
Receive data (input)
Ready to send (output)
Clear to send (input)
Data send ready (output)
Ground 0V
Probe connection
Data terminal ready (input)
CONNECTORS AND
CONNECTIONS
Содержание VNP400
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