Casio WK3800 Instruction Manual - Page 42

Data Receiver Data Sender Operation HDR → Send Request (Optional) ← HDS Data Send HDA → Acknowledge ← HDS Data Send HDJ → Rejection (Send Canceled) The session can be canceled for any reason by sending an HDJ. The HDJ can be sent by the sending device or the receiving device. The bulk dump session is terminated immediately upon receipt of an HDJ. Data Receiver Data Sender Operation HDR → Send Request (Optional) ← HDS Data Send HDA → Acknowledge ← HDS Data Send : : HDJ → Data Receive Rejected (Send Canceled) Data Receiver Data Sender Operation HDR → Send Request (Optional) HDA → Acknowledge ← HDS Data Send HDA → Acknowledge ← HDS Data Send : : ← HDJ Data Send Rejected (Send Canceled) For example, when a communication request is received from an external source while the Instrument's SD card is being accessed, BSY is returned to an external device that sends BDS, BDR, HDS, HDR. When the BSY is received, the receiver must wait until this Model enters a session-enabled mode, or use a Prepare for Data Management parameter (see "20.2 Data Management Command List") to change to a communication-enabled mode. Data Receiver Data Sender BDR → ← BSY (Send Canceled) Operation Send Request Busy 42