Measurement-computing Micro 488/EX rev.2.1 Bedienungsanleitung PDF herunterladen (Seite 166)

Section 6 Controller Pass-Thru Operation

6.2

If the IEEE device has been addressed to talk but does not respond or finish

transmission by the time additional characters are received into the circular serial input

buffer, the talk sequence will be aborted to allow additional serial information to be

sent to the IEEE device.

6.2 Serial and IEEE Terminator Substitution

The Micro488/EX can be configured to provide serial to IEEE 488 and IEEE 488

to serial terminator substitution. This is useful when interfacing a serial host which

only issues carriage return [

] as an output terminator to an IEEE peripheral which

expects a carriage return followed by a line feed [

CR-LF

In this previous example, the serial terminator should be selected for

Only

while the IEEE terminator is set for

CR-LF

. When a serial

character is received it is

discarded and substituted with an IEEE

followed by an IEEE

. In the IEEE to

serial direction, the IEEE

is unconditionally discarded. Upon receipt of the IEEE

a serial

is substituted.

The Micro488/EX can be made totally data transparent by setting both the serial

and IEEE terminators to be

Only

. Refer to Section 2 for the proper

switch settings for both the IEEE and serial terminators.

6.3 IEEE Address Selection

SW3-1 through SW3-5 select the IEEE bus address of the IEEE peripheral the

Micro488/EX will be communicating with. In this mode, these switches set the

address of the IEEE device that will be controlled, not the address of the Micro488/EX.

The address of the Micro488/EX is automatically adjusted so that address conflicts will

not occur. The address is selected by simple binary weighting with SW3-1 being the

least significant bit and SW3-5 the most significant. If address 31 (reserved on the

IEEE bus) is selected in the controller mode, address 30 is assigned as the device it will

be communicating with. The following figure shows the IEEE address selection of 10.

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Measurement-computing Micro 488/EX rev.2.1 Bedienungsanleitung Seite 166