Instruction manual

6.3.1 RS232 Data Format

One Start Bit 8 Data Bits No Parity Bit 1 Stop Bit

6.3.2 RS232 Connector Details

On the rear panel of the unit, a 9 pin D-type male connector is provided for the

RS232 communication. The DSR and DTR handshake lines are not used. But the

interface cable which connects the COMM INTF on the instrument to the PC COM

port (COM 1 or COM 2) should interconnect the RXD and the TXD line, such that the

RXD input the instrument is the TXD output of the host controller or PC. Swapping is

done internally to avoid confusion in the connection. The connector definition of the

‘COMM INTF’ (as marked on the rear panel) are given below:

PIN NUMBER DESCRIPTION

PIN 2 Receive Data (RXD)

PIN 3 Transmit Data (TXD)

PIN 5 Ground (GND)

Since the RS232 communication does not use the handshaking the DSR

input of the controller should be tied up to a signal that is always TRUE. However

this implies that your BUS CONTROLLER must always be ready to accept the

data. So the interface cable has to be a customized one. Refer fig 6.1.

Fig. 6.1