|
|
|
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.
This equipment has been tested and found to conform to the directives and standards for a Class A Information Technology Equipment type and for the Commercial and Light Industrial equipment class.
The VIP-335 "SmartPipe"™ converters change RS-232 data to standard PC keyboard signals so it can be fed directly into a PC's keyboard port. A standard PS/2 keyboard (or an AT style keyboard with an adapter) can also be connected to the "SmartPipe" and will be merged with the RS-232 data. The keyboard connection is optional and not necessary for the VIP-335 to operate. The VIP-335 is powered from the PC.
There are five steps to prepare the Converters for operation.
ALL CONNECTIONS SHOULD BE MADE WITH THE PC POWER OFF !!
1. Selection of baud rate: Set the baud rate using configuration DIP switch "SW1", which is located at one end of the converter, next to the DB-9 pin connector. A selection of six different baud rates is available - 19200, 9600 (factory setting), 4800, 2400, 1200, and 300. To change the factory setting of 9600 baud, use switches 1, 2, and 3 of SW1 as shown in the Baud Rate Selection diagram to set a new baud rate. For a new baud rate to take effect, the converter must be powered off and then powered on again.
2. Set data translation mode: The converter can be set to data translation mode or no data translation mode, using configuration DIP switch "SW1" (factory setting is no translation switch 4 of SW1 DOWN). To change the factory setting, set switch 4 of SW1 UP to select data translation. More information on this subject is given later.
3. Connect the PC: Use the male-male 6 pin Mini-DIN PC keyboard extension cable supplied with the Converter to connect the Converter to the PC's keyboard connector. This cable should be connected from the connector marked "TO PC KBD PORT" to the PC. The Converter is powered from the PC via this cable. An adapter the VIP-301-5M6F (may be purchased separately) is needed for connection to an AT style PC. The Converter should be connected to the PC only while the PC is powered down.
4. Connect the Keyboard (optional): Use the keyboard's cable to connect the keyboard to the female 6 pin DIN connector on the Converter marked "KEYBOARD IN". The keyboard will be powered from the PC via the Converter and via the keyboard cable. It is not necessary for a keyboard to be connected for the Converter to operate. An adapter, sach as the VIP-301-5F6M, which may be purchased separately, will be needed if an AT style keyboard is to be used.
5. Connect the RS-232 device: Use an appropriate cable to make this connection. A female DB-9 connector on the cable is needed to connect to the Converter. The Converter accepts (receives) RS-232 data on pin 2. The table shows the pins used by the Converter. See Data Throughput discussion below to determine if you need to connect and use the CTS (Clear To Send) signal.
|
|
|
|
|
Converter receives data on this pin |
|
|
Ground |
|
|
CTS - Clear TO send. The Converter controls this pin to indicate when RS-232 data can be sent to it. The PC may inhibit keystroke reception. The Converter then makes this pin inactive. No data should be sent to the Converter unless this pin is active. Data is lost otherwise |
The DATA FORMAT accepted by the Converters is one start bit, eight (8) data bits, least significant bit first, one stop bit, no parity.
Data Translation Mode
With SW1 switch 4 UP the Converters accept ASCII codes on their RS-232 input, which is a male DB-9 connector. The Converters then change these codes into equivalent PC keyboard scan codes and output the scan codes on the DIN connector marked "TO PC KBD PORT". In this fashion, ASCII-coded RS-232 devices can be used to drive a PC's keyboard input. The conversion of ASCII codes to equivalent PC keyboard key strokes is shown in the ASCII to Keyboard Conversion Table.
No Data Translation (Clear) Mode
With SW1 switch 4 DOWN (factory setting) the Converters accept 8-bit data bytes on their RS-232 input, which is a male DB-9 connector. The Converters change these codes from the asynchronous RS-232 protocol and from RS-232 voltage to the bit-synchronous protocol and +5 volt level acceptable to a standard PC keyboard input. The converted bytes are output on the DIN connector marked "TO PC KBD PORT". Since no data translation takes place, for most applications, the RS-232 data should be the scan codes generated by the PC keyboard.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
NOTE: SW1-4 controls Data Translation Mode - see text above
Data Throughput
The PC accepts keyboard data at a limited rate, which is significantly slower than the possible RS-232 ASCII character input rate. The converter provides a 64 byte buffer, but unless CTS is obeyed, the maximum number of characters that can be sent without loss is limited. In addition, ASCII characters that require a PC shift for proper representation, require the simulation of the Shift key, introducing additional delay. The table below gives maximum burst sizes in ASCII characters that can be sent without loss under the best of conditions. Caution is needed in using the data from the table, since certain PC applications can be quite slow in accepting keyboard data. In such cases, the burst sizes will be less than given in the table. The table should be used only as a guide in estimating whether CTS should be used to assure data integrity.
|
|
ALL UNSHIFTED |
ALL SHIFTED |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Lock |
|
|
|
||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||
|
|
|
|
|
|
|
|
|
|
|
|
Up |
|||||
|
|
|
|
|
|
|
|
|
|
|
|
Down |
|||||
|
|
|
|
|
|
|
|
|
|
|
|
Arrow |
|||||
|
|
|
|
|
|
|
|
|
|
|
|
Arrow |
|||||
|
|
|
|
|
|
|
|
SCLK |
SCLK |
|
|
Arrow |
|||||
|
|
|
|
|
|
|
|
|
LWIN |
LWIN |
|
|
Arrow |
||||
|
|
|
|
|
|
|
|
|
RWIN |
RWIN |
|
|
Screen |
||||
|
|
|
|
|
|
|
|
|
|
|
|||||||
|
|
|
|
|
|
|
|
|
|
|
|
||||||
|
|
|
|
|
|
|
|
|
|||||||||
|
|
|
|
|
|
|
|
|
|
||||||||
|
|
|
|
|
|
|
|
|
|||||||||
|
|
|
|
|
|
|
|
1. Blank Table entries indicate no output. 2. M - make code only (simulates "stuck" key); B - break code only (releases "stuck" key) 3. C/A/D - results in soft reset combination: Control/Alt/Delete. 4. LCNT/RCNT - left/right control keys; LSHF/RSHF - left/right shift keys; LALT/RALT - left/right Alt keys; NUM LK - Num Lock key; CAP LK - Caps Lock Key; SCROLL LK - Scroll Lock key. 5. NUM prefix denotes keys from NUM pad. 6. PRT SCR is Print Screen key. 7. LFTWIN, RTWIN, WINAPP are the Windows 95 keys. 8. Keys are specified by US English keyboard keycap legends.
Copyright © 1996 - 2011 by
Vetra Systems Corporation, All Rights Reserved, Printed in U.S.A.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
275-J Marcus Blvd. Hauppauge, NY 11787 USA Toll Free 1-800-537-9296 Tel: 631-434-3185 Fax: 631-434-3516 e-mail: sales@vetra.com |