The GPIB communication with Lakeshore controllers causes trouble

The Lakeshore temperature controllers are very sensitive to the control characters that delimit a message string, e.g.: The command

ONLINE$>$ $*$ = gpib( 9„ “CDAT?”char(10))

prompts the controller for some output. The prompt string is delimited by a <lf> byte (char(10)). This has to match the setting at the controller.