51
Serial Interface
Transfer Protocol
Sending of commands
In order to control the VM-83 from a computer or to retrieve measurement data,
certain commands must be sent to the VM-83. The data exchange must be per-
formed according to certain rules, to ensure that both the VM-83 and the com-
puter recognize the commands and data properly.
To send commands to the VM-83, the following procedure must be observed.
The following explanation assumes that the preparations described on page 49
have been completed.
** stands for the ID number.
Example : If the ID number 0 is set, ** stands for 00.
1. The computer sends RMT1**<CR><LF> to the VM-83.
2. When RMT1**<CR ><LF> has been received, the VM-83 returns
<ACK >READY<CR><LF> to the computer. The link is now estab-
lished, and the indication REMOTE appears on the display of the
VM-83.
3. To change a setting at the VM-83, the computer sends (setting command)
<CR><LF> to the VM-83.
4. When a valid setting command is received by the VM-83, it carries out
the respective processing steps. When these are completed successfully,
the VM-83 returns an <ACK>READY<CR><LF> to the computer.
5. To receive data, the computer sends (data request command) <CR><LF>
to the VM-83.
6. When the VM-83 receives a command which requests data, it carries out
the respective processing steps and sends (data) <EOT><CR><LF> to
the computer.
7. To terminate the link, the computer sends RMT0**<CR><LF> to the
VM-83.
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