Measurement-computing Micro 488/EX rev.2.1 Uživatelský manuál stáhnout pdf (Strana 170)

Section 6 Controller Pass-Thru Operation

6.6

Selecting RS-232 Signal Levels

J205

J206

RS-422 RS-232

Shorting Plug

After configuration, turn on the plotter and the Micro488/EX. The Micro488/EX's

front panel LEDs should all light momentarily while it performs an internal ROM and

RAM test. All LEDs should go out except for the Power and Talk LED. The Talk LED

indicates that the Micro488/EX has detected the plotter on the IEEE bus and has

addressed it to listen.

When the serial host begins to send the Micro488/EX data, the Receive LED will

flash. If it does not, this indicates that the interface is not receiving data from the serial

host. Verify the cables are connected properly and the serial cable wiring. Verify the

serial data format, word length, stop bits and parity.

6.6 Printer Applications

Most of the information given for plotter applications applies to applications for

interfacing IEEE 488 printers to a serial host. Some high end printers have a secondary

command setting which must be disabled for the Micro488/EX to control them. The

Micro488/EX does not use secondary commands to control IEEE peripherals, such as

printers or plotters. Refer to the printer's instruction manual if the is a question as to

whether the printer requires secondary commands.

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Measurement-computing Micro 488/EX rev.2.1 Uživatelský manuál Strana 170