Datalogic GWY-01-PBS-01 Especificações descarregar pdf (Página 43)

GWY-01-DNT-01 MANUAL – REV. 02 CHAPTER 4:

COMMAND MAPPING

PAGE 43 OF 67

4.7.1 CBx - Error Response Example

Below is an example of a typical controller generated error response following a

failed Read Data Command. For this example, a “tag not found” error was generated.

ERROR RESPONSE PARAMETER MSB LSB

0x00 in MSB

Overall Length of Response in LSB

(in words)

0x00

0x07

Error Flag in MSB

Error Information Byte in LSB

0xFF

0x00 in MSB

Node ID Echo in LSB

0x00

0x01

Month and Day Timestamp:

(March 19

)

0x03

0x13

Hour and Minute Timestamp

(9:30: AM)

0x09

0x1E

Seconds Timestamp in MSB

(:03 seconds)

Number of Additional Bytes Retrieved in LSB

(0x01 for error responses)

0x03

0x01

Error Code in MSB: (0x07 = “Tag not Found”)

0x00 in LSB

0x07 0x00

4.8 NOTIFICATION MESSAGES

Notification Messages are small host-bound informational packets of data that are

issued by the Gateway when a specified Notification Event (or series of events)

occurs within the Gateway or on the Subnet network. For example, the Gateway can

be configured to send the host a Notification Message when a controller is attached,

or removed, or experiences a problem.

The Gateway stores nine different Notification Messages internally (all of which are

enabled by default). A 16-bit value, called the Notification Mask, controls which

Notification Events trigger Notification Messages to the host. Bits 01 through 09 in the

16-bit Notification Mask correspond to the nine possible Notification Messages. The

remaining 7 bits (bits 10-16) are not implemented at this time (default value is zero

for each bit).

Notification Messages are enabled by changing the associated bit from zero to one

within the Notification Mask. A bit is either set to “0” (OFF – disabled) or “1” (ON –

enabled). When a bit is turned ON, the related Notification Message will be enabled.

The next time the enabled Notification Event occurs, the corresponding Notification

Message will be generated and immediately delivered to the host.

When a Notification Message is generated, it is written to the Node Output Page of

the controller that triggered the Notification Event. Notification Messages include a

one-byte value indicating which of the nine possible Notification Events occurred.

Notification Messages also contain a one-byte value that identifies the affected Node

ID.

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 66 67

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