Agilent Technologies E1301B, E1300B Sending Binary Data Over RS-232, Setting Up the Mainframe

Table D-1. Correction Codes for RS-232 Transmission

Data Value	Correction Code	Byte in Hex	Byte in Decimal
0	0	80h	128
1	7	F1h	241
2	6	E2h	226
3	1	93h	147
4	5	D4h	212
5	2	A5h	165
6	3	B6h	182
7	4	C7h	199
8	3	B8h	184
9	4	C9h	201
10	5	DAh	218
11	2	ABh	171
12	6	ECh	236
13	1	9Dh	157
14	0	8E h	142
15	7	FFh	255

Sending Binary Data Over RS-232

The RS-232 interface differs from the GPIB interface in that there is no device addressing built into the interface definition. Device addressing must be done on top of the RS-232 functions. This addressing is done through the same mechanism as the terminal-based front panel, and must be done either by the transfer program or manually before starting the transfer program.

Setting Up the Mainframe

There are two commands (SI - Select and Instrument and SA - Select Address) that can be used at the "Select an Instrument" interface. The "Select an Instrument" interface can always be reached by sending the < CTRL-D> character (ASCII 4) over the RS-232 line. Once there, the System Instrument can be reached by sending the command "SI SYSTEM" followed by a carriage return. All output after this command will be directed to/from the System Instrument until another < CTRL-D> is received. The following sequence will make sure that the mainframe is set up and ready.

1.Send < CTRL-D> (ASCII 4) to get to the "Select and Instrument" interface.

2.Send "ST UNKNOWN" and a carriage return to insure that the terminal is set to dumb terminal mode.

D-2 Sending Binary Data Over RS-232