Communication Interfaces
VTK-TR-BA-072e-1 - User Manual MDS 358X Series
The following parameter configuration is used for the communication with the control unit:
• Synchronous mode: Half-duplex
• Bits/s: 9600 – 115200 (5 different options available, see paragraph 4.5.6, page 37)
• Start bit: 1
• String length: 8 bit (ASCII)
• Parity: None
• Stop bit: 1
• Log: None
8.1.2 RS-232C Commands
The available commands are listed below. They are explained on the following pages, together
with short examples. This list is according to firmware revision 4085AA1-C.
Each command has to be followed by a line feed (LF, \n, 0x0a) and then a carriage return (CR, \r,
0x0d). It is important to keep to this order!
INFORMATION
Response to commands
The control unit gives a response to every command send to her. Possible answers are:
• A value or set of value, asked for in the command
• OK, to acknowledge a command sent
• NAK (“not acknowledged”), if command sent was incorrect (e.g. incomplete set of values or a
value outside the range, or after start-up a wrong command while the display shows the
message “Please do Adjust”)
• “Auxiliary Mode”, if you send the command “SYSTEM:SHOW:VALVEID” while the system is in
the auxiliary mode.
If there is no response to a command, either the connection is interrupted (e.g. malfunctioning
cable or interface) or the command did not end in a carriage return (0x0d).
The reaction times for the commands are given in the table in the next chapter. The table lists the
values for the highest and lowest baud rate, since these have a great influence on the times. The
length of a response is also influential. There it makes e.g. a big difference with the ESR
commands, if there are only a few errors reported or many of them. Please be aware that your
hardware also influences the reaction times. Therefore, the given times are only guidelines.
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