User Manual

2400 Series SourceMeter
®
User’s Manual Remote Operations 14-13
Multiple response messages
If you send more than one query command in the same program message (see
“Multiple command messages,” page 14-11), the multiple response messages for
all the queries are sent to the computer when the SourceMeter is addressed to
talk. The responses are sent in the order the query commands were sent and are
separated by semicolons (;). Items within the same query are separated by com-
mas (,). The following example shows the response message for a program mes-
sage that contains four single item query commands:
0; 1; 1; 0
Response message terminator (RMT)
Each response is terminated with an LF (line feed) and EOI (end or identify). The
following example shows how a multiple response message is terminated:
0; 1; 1; 0 <RMT>
Message exchange protocol
Two rules summarize the message exchange protocol:
Rule 1. You must always tell the SourceMeter what to send to the computer.
The following two steps must always be performed to send information from the
instrument to the computer:
1. Send the appropriate query command(s) in a program message.
2. Address the SourceMeter to talk.
Rule 2. The complete response message must be received by the computer
before another program message can be sent to the SourceMeter.
RS-232 interface operation
NOTE The programmable aspects of RS-232 operation (baud rate, data bits,
parity, and terminator are configured from the COMMUNICATION option
of the Main Menu. (See
Section 1, “Main menu.”)
Sending and receiving data
The RS-232 interface transfers data using 8 data bits, 1 stop bit, and no parity.
Make sure the device you connect to the SourceMeter also uses these settings.