Agilent Technologies 6812B, 6813B, 6811B RS-232 Interface, Interface Commands, RS-232 Data Format

Installation - 2

RS-232 Interface

The ac source provides an RS-232 programming interface, which is activated by commands located under the front panel Address key. When the RS-232 interface is selected, the GPIB interface is disabled.

NOTE: Sending or receiving data over the RS-232 interface when not configured for REMOTE operation can cause unpredictable results. Always make sure the ac source is configured for remote operation when using the RS-232 interface.

Interface Commands

All SCPI commands are available through RS-232 programming. The SYSTem:LOCal, SYSTem:REMote, and SYSTem:RWLock commands are only available through the RS-232 interface.

SYSTem:LOCal Places the ac source in local mode during RS-232 operation.The front panel keys are functional.

SYSTem:REMote Places the ac source in remote mode during RS-232 operation. All front panel keys except the LOCAL key are disabled.

SYSTem:RWLock Places the ac source in remote mode during RS-232 operation. All front panel keys including the LOCAL key are disabled.

RS-232 Data Format

♦constant 11-bit data format

♦one start bit

♦seven data bits plus a parity bit (even or odd parity), or eight data bits without parity (parity bit is "0")

♦two stop bits

You can specify one of the following baud rates: 300 600 1200 2400 4800 9600

NOTE: The ac source always uses one start bit and two stop bits regardless of the baud rate. The number of start and stop bits is not programmable.

RS-232 Connector

The RS-232 connector is a DB-9, male connector. You can connect the ac source to any computer or terminal with a properly configured DB-25 connector. You can use a standard Agilent 24542G or 24542H interface cable.

Table 2-2.RS-232 Connector

1 2 3 4 5

6 7 8 9

Pin

1

2

3

4

5

6

7

8

9

Input/Output

Output

Input

Output

Output

Common

Input

Output

Description

Reserved for service use Receive Data (RxD) Transmit Data (TxD)

Data Terminal Ready (DTR) Signal ground

Data Set Ready (DSR) no connection

no connection

Reserved for service use

29