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ABM-4082
7.
Press Auto (ENTER) to confirm the selection. The message "CHANGE SAVED" will be displayed to
show that the change is now in effect. DMM will exit the parameter level and move up a level to the
command level.
Press Shift →
8.
5.2.6
Software Handshake ON/OFF
You can enable or disable the software handshake.
Perform the following steps to enable or disable software handshake.
Press Shift →
1.
2.
Use
or
displayed.
3.
Press
to move down to the command level within the I/O MENU, "1: GPIB ADDR" will be
displayed.
4.
Use
or
5.
Press
to move down a level to set the return on or off.
6.
Use
or
7.
Press Auto (ENTER) to confirm the selection. The message "CHANGE SAVED" will be displayed to
show that the change is now in effect. DMM will exit the parameter level and move up a level to the
command level.
Press Shift →
8.
5.2.7
Software Protocol
Since the hardware handshaking lines CTS and RTS are not used by DMM, the multimeter uses the
character return method to decrease the data losses and errors during communication. Please refer to the
content below before programming communication software.
1.
For command syntax and format, refer to Chapter 6 Command Reference.
2.
The controller transmits the command using the ASCII code with <LF>, <CR> or <LF><CR> as the
terminal character. DMM executes the command after the terminal character is received.
3.
The character received by DMM will be sent back to the controller again. The controller will not send
the next character until the last returned character is received correctly from DMM. If the controller fails
to receive the character sent back by DMM, the reasons are listed as follows:
The serial interface is not connected correctly.
Check if the RS232 function is enabled, if the same baud rate is selected for both DMM and the
controller.
When DMM is busy with executing a bus command, DMM will not accept any character from the
serial interface at the same time. So the character sent by controller will be ignored. In order to
make sure the whole command is sent and received correctly, the character without a return
character should be sent again by the controller.
4.
DMM only sends information under following two conditions. The first is when a character is received
normally; DMM will send the character back as a response when return function is ON. The second is
52
key to exit from the menu and return to the measurement status.
to enter the menu on the menu level, "A: MEAS MENU" will be displayed.
key to move across to the I/O MENU on the menu level, "E: I/O MENU" will be
key to move across to the PARITY command, "6: RETURN" will be displayed.
key to select ON or OFF.
key to exit from the menu and return to the measurement status.
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