Black Box PCW22A-R3, PCW22A-R4 manual Introduction

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PROTOCOL CONVERTER A/S-2G

2.0 Introduction

The Model A/S-2G provides compatibility between an asynchronous, ASCII coded device and a synchronous, EBCDIC coded device. It is desirable, prior to installation, to review the following checklist to ensure the appropriateness of all the devices in the system for the planned application.

Synchronous (Bisynchronous) Side -

Which Protocol is being used? (2770, 2780, 3741, or 3780)

If IBM® -- is the line to be used a Bisynchronous line? Do you have the BSC Communications package?

Is machine code EBCDIC?

Asynchronous Side -

Is transmission code ASCII?

Will it operate in TTY format (start/stop, RS-232, 7 bit, and even-odd mark or space parity)?

The A/S-2G is equipped with two bidirectional RS-232C ports. These ports, labeled Port A and Port B, transfer data at up to 19.2 Kbps. Either or both ports may be connected directly to a terminal, CPU, or an appropriate modem. You configure each port’s operational parameters independently by setting DIP shunts, DIP switches, and jumpers (explained in Chapter 3.0).

Diagnostic LEDs are mounted on the front of the unit. These LEDs are labeled Port A and Port B. They are directly associated with the two ports and indicate the status of the A/S-2G at the port indicated.

The reset button on the back panel will cause the A/S-2G’s Z80A microprocessor to reinitialize (reset).

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Contents Protocol Converter FCC Statement Protocol Converter A/S-2G Table of Contents Synchronous Device to Asynchronous Device RXC SpecificationsIntroduction Unpacking and Inspection InstallationData Flow Control 2 SW2 SELF-DIAGNOSTICS Switch #4 on =5 RS-232 PASS-THROUGH Options Reconfigure Switch ModeReset Options Data Terminal Ready DTR Signal OptionsBaud Rate Options Clear to Send CTS Signal OptionsModem or DIRECT-TO-TERMINAL Connection Carrier Options Preparing the A/S-2G for Connection to a Synchronous DeviceCable Requirement External or Internal Clocking Option Command PASS-THRU Asynchronous Device to Synchronous Device OperationFlow Control USE of Carriage Return a 2770/2780 ModeVerification of Data Reception Presentation of Data from A/S-2G to Synchronous DeviceLine Turnaround 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 Input Data Format Synchronous Device to Asynchronous DeviceEbcdic characters stripped Data Flow A/S-2G to Asynchronous Device Operation EOT Installing or Replacing Proms Transparency Mode of OperationConversions and Connections GND RS-232 Cable ChartCode Conversions Special Conversions Printed Board Circuit Layout Printed Circuit Board LayoutPark Drive Lawrence, PA
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