Agilent Technologies E1300B User Manual page 234

1
Sending Binary
Data Over RS-232
Setting Up the
Mainframe
D-2 Sending Binary Data Over RS-232
Table D-1. Correction Codes for RS-232 Transmission
Data Value Correction Code
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
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.
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.
Byte in Hex
0 80
h
7 F1
h
6 E2
h
1 93
h
5 D4
h
2 A5
h
3 B6
h
4 C7
h
3 B8
h
4 C9
h
5 DA
h
2 AB
h
6 EC
h
1 9D
h
0 8E
h
7 FF
h
Byte in Decimal
128
241
226
147
212
165
182
199
184
201
218
171
236
157
142
255