Measurement-computing Serial488A Manual do Utilizador descarregar pdf (Página 4)

1.2

1.2 Serial488 and Serial488A Differences

The

Serial488A

is both a hardware and firmware upgrade to the

Serial488

When issuing product improvements, we try to maintain transparent compatibility.

Occasionally this is not possible. You should note the following differences between

the two products.

1. The

Serial488

allocated fixed serial and IEEE input buffers of 4000

characters. The

Serial488A

utilizes a 32,000 character buffer which is

dynamically allocated to the serial and IEEE input buffers as required.

Refer to Section 4.2 for more details

2. The

Serial488A

has the ability to output RS-232 or RS-422 levels. The

levels used are internally selectable. Refer to Section 2.8 for details.

3. As a peripheral, the

Serial488A

's serial poll status byte has been

changed to include status of the serial handshake. Other minor changes

have also been included. Refer to Section 4.4 for a complete description

of the serial poll status byte.

4. The internal switch settings for baud rate have been adjusted to include

57600 baud. Refer to Section 2.3 for the new switch settings.

1.3 Serial488A, Serial488A/OEM and Serial488/512K Differences

1. The

Serial488A

and

Serial488A/OEM

utilize a 32,000 character buffer

which is dynamically allocated to the serial and IEEE input buffers as required. The

Serial488/512K

utilizes a 512,000 character buffer which is dynamically allocated to

the serial and IEEE input buffers as required.

2. The

Serial488A

and

Serial488A/OEM

have the ability to output RS-232 or

RS-422 levels. The

Serial488/512K

can only operate at RS-232 levels.

3. The

Serial488A

and

Serial488A/OEM

can operate at selectable baud rates

up to 57600 baud. The

Serial488/512K

can operate at selectable baud rates up to

19200 baud.

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