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.
3.4.1SERIAL TERMINATOR
SW2-3 and SW2-4 select the serial terminators for the serial input and output. The factory default is LF Only.
1 2 3 4 5 6 7 8
OPEN
CR Only
1 2 3 4 5 6 7 8
OPEN
LF Only
1 2 3 4 5 6 7 8
OPEN
LF-CR
1 2 3 4 5 6 7 8
OPEN
CR-LF
Figure 3-8. Switch SW2: Selecting the Serial Terminator.
