Black Box PCW22A-R4, PCW22A-R3 manual Operation

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		CHAPTER 4: Operation
Data Flow — A/S-2G to Asynchronous Device
Bisynchronous Device	A/S-2G Converter	Asynchronous Device

Send data block D

NAK

Send data block D

ACK 0

when available

Send block D

If data not properly received by A/S-2G:

Send data block E

NAK

Retransmit block E

ACK 1 (when

correctly received)

Send block E

If data not yet available from synchronous device while synchronous line to A/S-2G is engaged:

2-second interval from previous ACK

TTD

NAK

2-second interval

TTD

NAK

Continues until data available

25

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Contents Protocol Converter FCC Statement Protocol Converter A/S-2G Table of Contents Synchronous Device to Asynchronous Device Specifications RXCIntroduction Data Flow Control InstallationUnpacking and Inspection 2 SW2 Switch #4 on = SELF-DIAGNOSTICSData Terminal Ready DTR Signal Options Reconfigure Switch ModeReset Options 5 RS-232 PASS-THROUGH OptionsModem or DIRECT-TO-TERMINAL Connection Clear to Send CTS Signal OptionsBaud Rate Options Cable Requirement Preparing the A/S-2G for Connection to a Synchronous DeviceCarrier Options External or Internal Clocking Option Command PASS-THRU Operation Asynchronous Device to Synchronous DeviceUSE of Carriage Return a 2770/2780 Mode Flow ControlLine Turnaround Presentation of Data from A/S-2G to Synchronous DeviceVerification of Data Reception Data Flow A/S-2G to Synchronous Device NAK Echo CR LF Send block F Echo all but CR LF Data Flow A/S-2G to Synchronous Device Synchronous Device to Asynchronous Device Synchronous Input Data FormatEbcdic characters stripped Data Flow A/S-2G to Asynchronous Device Operation EOT Conversions and Connections Transparency Mode of OperationInstalling or Replacing Proms RS-232 Cable Chart GNDCode Conversions Special Conversions Printed Circuit Board Layout Printed Board Circuit LayoutPark Drive Lawrence, PA