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®
Serial Communications
COMT 366 Series
RS-232 to RS-485 Converter
with LCD, 38.4 kbps Data Rate
COMT 366M: DB-25M Connector
COMT 366F: DB-25F Connector
USER'S MANUAL
VER. D • OCT 2001
No part of this manual may be reproduced without permission
CyberResearch
, Inc.
®
www.cyberresearch.com
25 Business Park Dr., Branford, CT 06405 USA
203-483-8815 (9am to 5pm EST) FAX: 203-483-9024
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Summary of Contents for CyberResearch RS-232
- Page 1 ® Serial Communications COMT 366 Series RS-232 to RS-485 Converter with LCD, 38.4 kbps Data Rate COMT 366M: DB-25M Connector COMT 366F: DB-25F Connector USER’S MANUAL VER. D • OCT 2001 No part of this manual may be reproduced without permission CyberResearch , Inc.
- Page 5 CyberResearch, Inc. In no event will CyberResearch, Inc. be liable for direct, indirect, special, incidental, or consequential damages arising out of the use of or inability to use the product or documentation, even if advised of the possibility of such damages.
- Page 6 ® COMT 366 Series CyberResearch Serial Communications COMT 366 Series ©Copyright 2001 CyberResearch, Inc.
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Page 7: Fcc Information
Le present appareil numerique n'emet pas de bruits radioelectriques depassant les limites applicables aux appareils numeriques de la classe A prescrites dens le Reglement sur le brouillage radioelectrique edicte par le ministere des Communications du Canada. CyberResearch, Inc. 25 Business Park Drive P: (203) 483-8815; F: (203) 483-9024 Branford, CT USA www.cyberresearch.com... -
Page 8: Table Of Contents
2.7 Size ... 3 2.8 Environment ... 3 3.0 Installation ... 4 4.0 Operation ... 5 4.1 Termination of the Line... 6 5.0 Troubleshooting... 7 6.0 RS-232 Pin Number Assignments... 9 7.0 Power... 10 7.1 COMT 366... 10 ® CyberResearch Serial Communications... -
Page 9: General Description
(the space condition). The vertical bar connecting the lower segment to the upper segment is always on when power is applied. CyberResearch, Inc. 25 Business Park Drive P: (203) 483-8815; F: (203) 483-9024 Branford, CT USA www.cyberresearch.com... - Page 10 If the control signal is negative, the three-letter mnemonic is not displayed. For most full-duplex data-only converters, CTS and RTS are connected together while DSR, DCD, and DTR are connected together. The LCD display will help verify correct operation. ©Copyright 2001 CyberResearch, Inc.
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Page 11: Specifications
® CyberResearch Serial Communications COMT 366 Series 2.0 Specifications 2.1 Interface Conforms to EIA RS-232 and RS-485 specifications. 2.2 Connectors Five-position terminal block. 2.3 Data Rate 0 to 38.4 KBPS 2.4 Switches DTE/DCE selector switch: allows reversing of Pins 2 and 3 of EIA-232 connector. -
Page 12: Installation
DTE or DCE type device. The DTE/DCE selector switch allows for reversing Pins 2 and 3 ( TD and RD), thereby eliminating the need for null modem cables. If the switch is in the DTE position, Pin 2 of the RS-232 connector is an output for the COMT 366. -
Page 13: Operation
RS-485 transmitter and receiver as set by the Mode switches. Mode 4 disables the transmitter completely, regardless of the RTS/CTS signal; the RTS display reflects the disabled status. CyberResearch, Inc. 25 Business Park Drive Branford, CT USA control... -
Page 14: Termination Of The Line
The value chosen should match the characteristic impedance of the twisted pair being used. The termination value can be selected using the following table CyberResearch Switch Termination Value OHMS None ©Copyright 2001 CyberResearch, Inc. ® Serial Communications... -
Page 15: Troubleshooting
Pin 2. However, data will not be displayed until it is received at its input port, Pin 3. CyberResearch, Inc. 25 Business Park Drive P: (203) 483-8815; F: (203) 483-9024 Branford, CT USA www.cyberresearch.com... - Page 16 If the converter is functioning correctly, any data entered on the keyboard of the terminal should appear on the screen and the TD and RD indicators should flash indicating the flow of data. CyberResearch ©Copyright 2001 CyberResearch, Inc. ® Serial Communications...
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Page 17: Rs-232 Pin Number Assignments
® CyberResearch Serial Communications 6.0 RS-232 Pin Number Assignments CCITT Name Transmit Data Receive Data Request to Send Clear to Send Data Set Ready Signal Ground Data Carrier Detect 108.2 Data Terminal Ready * These signals can be reversed using the selector switch. -
Page 18: Power
The COMT 366 is powered by a small, wall-mounted transformer that supplies 12 VDC @ 500 mA. The transformer must be connected to the COMT 366 through the 1.3mm connector located on the side of the unit before plugging the transformer into the wall. ©Copyright 2001 CyberResearch, Inc. -
Page 19: Product Service
Signal connections and programming are the two most common sources of difficulty. CyberResearch support personnel can help you solve these problems, especially if you are prepared for the call. - Page 20 ® COMT 366 Series CyberResearch Serial Communications Intentionally Blank ©Copyright 2001 CyberResearch, Inc.
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Page 21: Warranty Notice
CyberResearch, Inc. will, at its option, repair or replace the defective item under the terms of this warranty, subject to the provisions and specific exclusions listed herein. - Page 22 ® COMT 366 Series CyberResearch Serial Communications Intentionally Blank ©Copyright 2001 CyberResearch, Inc.
- Page 24 CyberResearch, Inc. 25 Business Park Drive Branford, CT 06405 USA P: (203) 483-8815; F: (203) 483-9024 www.cyberresearch.com...
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