Amplifier Research 75A250A Руководство - Страница 8

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Model 75A250A

2.2.2 Remote Operation (continued)

2.2.2.4.2 IEEE-488 device address selection (continued)

Device Address

Switch 1

2.2.2.5

Command Set Format

Each command is composed of one alpha character, up to four numeric parameters, and a

command termination character.

command, which is denoted and entered as <LF>. Commands are case-sensitive and must be

entered in upper case only in order to be recognized.

2.2.2.6

IEEE-488 Communications

For IEEE-488 communications, the "End or Identify" (EOI) control line may also be used for

command termination. When sending commands to the Model 75A250A via the IEEE-488 bus,

terminate each command with a <LF>, an EOI, or both. No characters are permitted after the

<LF> or EOI; the 75A250Ainterprets characters following the <LF> or EOI as the start of the

next command.

"Service Request" (SRQ) line is asserted; the operator can then perform a serial poll operation.

The Model 75A250A error code (in binary) is contained in the returned serial poll status byte

(STB). These error codes are defined in Table 2-2.

IEEE-488 Device Address Selection

off (0)

on (1)

When an error condition is present at the Model 75A250A, the

Table 2-1

Switch 5

Switch 4

off (0)

on (1)

The command termination character is the "line feed"

Switch 3

off (0)

on (1)

off (0)

on (1)

off (0)

on (1)

off (0)

on (1)

Manual Text

Switch 2

on (1)

off (0)

on (1)

off (0)

on (1)

off (0)

2-5

REV A