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<center>RS232C SERIAL INTERFACE <br> <br> USER INSTRUCTION BOOK <br>AMSTRAD RS232C SERIAL INTERFACE WITH ROM SOFTWARE AND POWER SUPPLY <br>AMSOFT <br>A division of CONSUMER ELECTRONICS PLC. <br>© Copyright 1985 AMSOFT, AMSTRAD Consumer Electronics plc. </center> Neither the whole nor any part of the information contained herein, nor the product described in this manual, may be adapted or reproduced in any material form except with the prior written approval of AMSTRAD Consumer Electronics plc. (‘AMSTRAD‘). The product described in this manual, and products for use with it are subject to continuous development and improvement. All information of a technical nature and particulars of the product and its use (including the information and particulars in this manual) are given by AMSTRAD in good faith. However, it is acknowledged that there may be errors or omissions in this manual. and a list of details of any amendments or revisions can be obtained by sending a stamped, self addressed envelope to AMSOFT Technical Enquiries.
AMSOFT welcome comments and suggestions relating to the product or to this manual.
All correspondence should be addressed to:
AMSOFT Brentwood House <br>169 Kings Road <br>Brentwood Essex <br>CM14 4EF
All maintenance and service on the product must be carried out by AMSOFT authorized dealers. Neither AMSOFT nor AMSTRAD can accept any liability whatsoever for any loss or damage caused by service or maintenance by unauthorized personnel. This guide is intended only to assist the reader in the use of the product, and therefore AMSOFT and AMSTRAD shall not be liable for any loss or damage whatsoever arising from the use of any information or particulars in, or any error or omission in, this manual or any incorrect use of the product.
Switch off the computer and remove anything connected to the computer‘s port marked ‘EXPANSION‘ or ‘FLOPPY DISC‘.
Push the connector plug at the end of the RS232C‘s ribbon cable onto the edge connector of the computer‘s port marked ‘EXPANSION‘ or ‘FLOPPY DISC‘.If required, refit any additional expansion interfaces to the RS232C ‘throgh-bus’ connection.Connect the lead from the RS232C power supply unit, into the small socket on the RS232C it self.
WARNING - ELECTRIC SHOCKNEVER ATTEMPT TO OPERATE THE RS232C POWER SUPPLY UNIT WITH ITS CASE REMOVED.
Switch on any additional expansion interfaces, connect the power supply unit on the RS232C to the mains supply, and switch on your computer, in that order.A ‘wake-up‘ message similar to the following will appear on the screen:
Always switch off in reverse order to the above, before disconnecting the RS232C (or any additional expansion interfaces) from the computer.
(Always disconnect the RS232C power supply unit from the mains supply socket when not in use.)
The RS232C operates at 9600 Baud unless instructed otherwise.
AMSTRAD BASIC: Use the command: |SETSIO,<<baud rate>>
CP/M2.2: The baud rate is set when CP/M is loaded. Refer to Appendix 2 (SETUP.COM) for full details on how to alter this power-on configuration.
CP/M Plus: The Baud rate can be changed by the command:
SETSIO, <<baud rate> >
… or by the command:
DEVICE SIO [<<baud rate>>]
Examples:
If you require an alternative baud rate, it must be set up every time you reset, the computer or move from BASIC to CP/M, or from CP/M to BASIC. When operating with CP/M Plus, it is possible to program the alternative baud rate as part of the loading process by incorporating the command given above into the ‘PROFILE.SUB‘ file.
NOTE - Under CP/M Plus, if the baud rate is changed by SETSIO,interrogation by use of the command DEVICE will not acknowledge the change.
== Spell 5: Setting framing bits (printer) ==