Kramer 691 User Manual page 50

The maximum string length is 64 characters.

Message starting character:



Device address – K-NET Device ID followed by @ (optional, K-NET only)

Query sign – ? follows some commands to define a query request

Message closing character:



Command chain separator character – Multiple commands can be
chained in the same string. Each command is delimited by a pipe character
(|). When chaining commands, enter the message starting character and
the message closing character only at the beginning and end of the string.
Spaces between parameters or command terms are ignored.
Commands in the string do not execute until the closing character is
entered. A separate response is sent for every command in the
chain.
44
# – For host command/query
~ – For device response
CR – Carriage return for host messages (ASCII 13)
CR LF – Carriage return for device messages (ASCII 13) and line-feed
(ASCII 10)
691 - Protocol 3000