Rockwell-automation 1771-DB BASIC MODULE Manual de usuario descargar pdf (Pagina 301)

Chapter

Call Routines 69–127

13 -43

Input Argument Three

The third input argument specifies the number of message retries when in

half-duplex mode or the number of ENQuiry retries to perform when in

full-duplex mode. Message retries specifies the number of message

transmission retry attempts made before giving up and flagging the

transmission as failed. PUSHing 0 indicates only the initial attempt is

made and if not acknowledged by the master the attempt is flagged as

failed. ENQuiry retries specifies the number of ENQ’s to transmit before a

packet transmission is flagged as failed. The valid range for both is 0 to

254.

Input Argument Four

The fourth input argument specifies the RTS On Delay time period when in

half-duplex mode or the number of NAK received retries to perform when

in full-duplex mode. RTS On Delay specifies in 5 ms increments the delay

between when a Request-To-Send (RTS) is activated and a transmission is

initiated. Only used if HDMwCC or HDMwoCC is selected through the

first input argument. The valid range for the RTS On Delay is 0 to 65535.

NAK Received Retries specifies the number of packet retries to transmit

due to receiving NAK responses. The valid range for NAK Received

Retries is 0 to 254.

Input Argument Five

The fifth input argument specifies the RTS Off Delay time period.

RTS Off Delay specifies in 5 ms increments the delay between when a

transmission is completed and a Request-To-Send (RTS) is deactivated.

The valid range for the RTS Off Delay is 0 to 65499. This argument is

only used if HDMwCC or HDMwoCC is selected through the first input

argument. This input argument is only used for half-duplex mode.

When full-duplex mode is selected a NULL value must be PUSHed.

Input Argument Six

The sixth input argument specifies the BASIC module address that the

DF1 driver responds to when receiving enquires from a remote DF1

device. Legal values are 0 to 254. This input argument is used for

half-duplex and full-duplex mode.

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Rockwell-automation 1771-DB BASIC MODULE Manual de usuario Pagina 301