RS-232↔IEEE 488 INTERFACE CONVERTER
5.5 Use of Serial and Bus Terminators
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 a serial device that only issues carriage return [CR] as an output terminator to an IEEE controller that expects a carriage return followed by a line feed [CR-LF].
In this previous example, 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 substituted with an IEEE CR followed by an IEEE LF. In the IEEE to serial 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. The choice of appropriate terminators may be determined by inspection of the serial device and IEEE controller’s instruction manuals. See Chapter 3 of this manual for instructions on selecting the interface converter’s serial and bus terminals.
5.6 IEEE 488 Bus Implementation
The interface converter implements many of the capabilities defined by the IEEE 488 1978 specification. These are discussed in the following sections. The interface converter does not support or respond to these bus uniline and multiline commands:
Remote Enable (REN)
Go to Local (GTL)
Group Execute Trigger (GET)
Local Lockout (LLO)
Take Control (TCT)
Parallel Poll (PP)
Parallel Poll Configure (PPC)
Parallel Poll Unconfigure (PPU)
Parallel Poll Disable (PPD)
