Measurement-computing Digital232 Manuel d'utilisateur télécharger pdf (Page 42)

Section 3 Command Descriptions

3.20

Status Un

The

Status

command (U0) will cause the Digital232 to send its status message to

the host computer. The status of the Digital232 may be read at any time without

interfering with normal operation. Any error conditions are cleared after the status

string is read by the host. The

Status

command (Un) also enables the controller to

read any single bit from the I/O ports (U1 through U40).

U0 Send the Digital232 status and clear any error conditions

Un Send the status of bit n (1 thru 40)

The format of the status byte returned by the Digital232 after receiving a U0

command is as follows….

1.0C#E#F#G#I###M#P#R#Y#

where each “#” equals the number corresponding to that command. The leading

information “1.0” is the revision level of the Digital232 software.

Example:

@@ reset the

Digital232

U0 send U0 to the Digital232

read the status byte

display = *.*C0E0F0G0I000M0P0R0Y*

The status returned after receiving a U1 through U40 is an ASCII character ‘1’ or

‘0’, depending on the level of the line, and the state of the Invert command (I16).

Example:

U22 request the status of bit 22, display shows, a 0 (dependent on

the signal applied to the input)

Below is a summary of the Status (U0) information.

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 58 59

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Measurement-computing Digital232 Manuel d'utilisateur Page 42