Xantrex Technology XDL 35-5TP Manuale Utente

  

The 9-way D-type serial interface connector is located on the instrument rear panel. The pin 
connections are as shown below: 

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 (addressable RS232 only) 

8 

TXD2 

Secondary transmitted data (addressable RS232 only)  

9 

GND 

Signal ground (addressable RS232 only) 

For single instrument remote control only pins 2, 3 and 5 are connected to the PC. However, for 
correct operation links must be made in the connector at the PC end between pins 1, 4 and 6 and 
between pins 7 and 8, see diagram. Pins 7 and 8 of the instrument must not be connected to the 
PC, i.e. do not use a fully wired 9–way cable. 

 
Baud Rate is set as described above in Address and Baud Rate Selection; the other parameters 
are fixed as follows: 

Start Bits:  1 

Parity:  None 

Data Bits:  8 

Stop Bits:  1 

For addressable RS232 operation pins 7, 8 and 9 of the instrument connector are also used. 
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: 

 

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: 

 28