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CHAPTER 3: Getting Started
3.4 Selecting Terminator Substitution
The interface converter can be configured to provide RS-232-to-IEEE-488 and
IEEE-488-to-RS-232 terminator substitution. This is useful when interfacing an
RS-232 device which only issues carriage return [CR] as an output terminator
to an IEEE controller which expects a carriage return followed by a line feed
[CR-LF].
In a case like that, the serial terminator should be selected for CR Only while
the IEEE terminator is set to CR-LF. When a serial CR character is received,
it is discarded, and an IEEE CR-LF is substituted for it. In the IEEE-to-RS-232
direction, the IEEE CR is unconditionally discarded. Upon receipt of the
IEEE LF, a serial CR is substituted.
The interface converter can be made totally data transparent by setting both
the serial and IEEE terminators to be CR Only or LF Only.
3.4.1 S
ERIAL
T
ERMINATOR
SW2-3 and SW2-4 select the serial terminators for the serial input and output.
The factory default is LF Only.
Figure 3-8. Switch SW2: Selecting the Serial Terminator.
Switch
Side
View
DOT
CR Only
1 2 3 4 5
6
7 8
OPEN
LF-CR
1 2 3 4 5
6
7 8
OPEN
1 2 3 4 5
6
7 8
OPEN
LF Only
1 2 3 4 5
6
7 8
OPEN
CR-LF