User manual

GMC-I Messtechnik GmbH 59
Stringing Commands Together
 You can string several commands together and transmit them as a
single unit.
 In this case, the individual commands are separated with
semicolons (;).
 Blanks can be entered to the left and to the right of the
semicolons.
Example:
USET 10; OUTPUT ON; IOUT?
Comments
 The individual commands are executed in the order they were
received.
 Setting and query commands can be mixed in a single
command string.
 If a string contains several query commands, semicolons (;) are
inserted between the requested parameters in the response string
as well.
 If a string contains a faulty command, this part of the command
is ignored and the corresponding error bit is set in the event
standard register (ESR), while the remaining commands are
nevertheless executed.
Terminating Device Messages
a) IEEE 488 control:
 The following end-of-text characters can be used for data receipt:
NL New line = line feed = (0Ahex)
NL & EOI EOI = end or identify
DAB & EOI DAB = last data byte
 The still common end-of-message character combination CR
LF (0D
hex
followed by 0A
hex
) should no longer be used
according to the standard.
 Although CR LF is accepted by the device for data receive, it
should be used in combination with EOI.
 In the case of transmission, the following end-of-message
character is used in the response string
NL + EOI
b) RS 232 control:
 The following end-of-text characters can be used for data receipt:
NL (0Ahex) = new line = line feed
CR (0Dhex) = carriage return
CR LF carriage return and line feed
ETB (17 hex)
ETX (03 hex)
 In the case of transmission, the following end-of-message
character is used in the response string
NL (0Ahex) = new line = line feed