Black Box PCW22A-R3 Manuel d'utilisateur télécharger pdf (Page 20)

CHAPTER 4: Operation

Data Flow — A/S-2G to Synchronous Device

Bisynchronous Device A/S-2G Converter Asynchronous Device

ACK 1

NAK

Negative Acknowledgment

AA AA 32 32 32 32 3D FF FF

ACK 0

WAK

AA AA 32 32 32 32 6B FF FF

Holds up transmission while

buffer clears DC3 (ASCII 13

Hex) or drop DTR CTS or

user-specified lead

Frees up buffer space.

(Echo CR LF)

Allow resumption of

transmission DC1 (ASCII 11

Hex) or raise DTR

Complete block D

Send block E

(Echo all but CR LF)

X-OFF

Send block C

X-ON

Send block D

Resend block D

Send block E

If A/S-2G buffer is nearly full when asynchronous device is transmitting:

If synchronous device has WAK capability and buffer is full:

2-second interval

If data not properly received by synchronous device or

synchronous device has no WAK capability and buffer is full:

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 32 33

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Black Box PCW22A-R3 Manuel d'utilisateur Page 20