Remote Operation
Remote Operation
16
RS232 Interface
Single Instrument RS232 Connections
The 9-way D-type serial interface connector is located on the instrument rear panel. The
pin connections are as shown below:
Pin Name
Description
1
-
No internal Connection
2
TXD
Transmitted data from instrument
3
RXD
Received data to instrument
4
-
No internal connection
5
GND
Signal ground
6
-
No internal connection
7
RXD2
Secondary received data (see diagram)
8
TXD2
Secondary transmitted data (see diagram)
9
GND
Signal ground
Pins 2, 3 and 5 may be used as a conventional RS232 interface with XON/XOFF
handshaking. Pins 7, 8 and 9 are used when the instrument is connected for addressable
RS232 operation, as described below.
Addressable RS232 Connections
Using a simple cable assembly, a daisy chain connection system between any number of
instruments up to the maximum of 32 can be made, as shown below:
INSTRUMENT
1
INSTRUMENT
2
INSTRUMENT
3
CONTROLLER
TO NEXT
INSTRUMENT
sha0017f.emf
The daisy chain consists of the transmit data (TXD), receive date (RXD) and signal
ground lines only. There are no control/handshake lines. This makes XON/XOFF
protocol essential and allows the inter-connection between instruments to contain just 3
wires.
The wiring of the adaptor cable is shown below:
16-3
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