Vetra SmartWye USB-311 User manual

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User Instructions for the
USB-311 and USB-312 "SmartWye"

PC USB Keyboard Encoders
Congratulations on your purchase of a VETRA USB Keyboard Encoder! This quality product is designed and built by us in
the USA and is backed by a VETRA Three-year Warranty and unlimited free technical support. We invite your comments,
please e-mail us at [e-mail] or call us at the numbers given at the end.
DESCRIPTION
The "SmartWye"äPC USB Keyboard Encoders make it easy to convert switch or contact closures to standard USB
keyboard codes for input to a PC’s USB port. The USB keyboard encoders enumerate as a standard HID keyboard, and
support USB bus suspend and remote wake-up. If enabled by the USB host, an input contact closure will generate a remote
wake-up signal on the USB bus. The USB Encoder model USB-312 contains an on-board USB hub providing an input for an
USB peripheral. If any device is connected to the hub, its current draw must not exceed 400 mA.
OPERATION
The encoder detects and debounces switch closures, generates appropriate key codes, and sends them to the PC. When the
switch is opened, the encoder sends a code indicating that the key is open.
GENERATED CODES
The USB Keyboard Encoder can generate one of four different USB keyboard code output configurations, selected by settings
of jumpers JP3 and JP4. Jumpers MUST BE set prior to applying power to USB Keyboard Encoder for correct keyboard code
configuration outputs. The USB codes generated are shown in the table below:
Jumper JP3 Jumper JP4 Keyboard Code Configuration
Not Installed Not Installed USB-311/312 Matrix Key Codes, see Table 2
Installed Not Installed USB-311/312 Function Key Codes, see Table 1, column –24F
Not Installed Installed USB-311/312 Numeric Key Codes, see Table 1, column –24N
Installed Installed USB-311/312 Alpha Key Codes, see Table 1, column –24A
The keyboard code generated for a given switch closure is shown in the two tables (maps) below in terms of US keyboard key
cap legends. J3 is the switch input connector to the USB PC keyboard encoder.
The first table, Table 1, shows three standard maps for the keyboard encoder models that accept up to 24 discrete contact
closures to ground. The key code is generated when the J3 pin in the table is closed to the GND pin. The "A" (ALPHA) map
generates mostly alphabetic keys, the "F" (FUNCTION) map generates functions keys, and the "N" (NUMERIC) map
generates numeric keys.
Table 2 applies to matrix-connected switches, such as found on many membrane keypads. The matrix configuration of the
keyboard encoder contains the complete Windows 104 keys of the standard PC keyboard with switches connected in an 8 by
13 matrix.
PREPARE FOR OPERATION
1. Set-up: You can connect the "SmartWye" USB Keyboard Encoder to the PC at any time (plug-and-play). You do not
have to power-down the PC to make this connection. Use a standard USB Type A-B cable (may be purchased separately
from Vetra) to connect the keyboard encoder to any convenient USB port on the PC. The USB Keyboard Encoder is
powered from the PC via this cable. After plug-in, the Pc takes a short time to recognize (enumerate) the USB Keyboard
Encoder; then the USB Keyboard Encoder is ready for operation. Jumpers (JP3 and JP4) must be set prior to applying
power to the encoder board for correct keyboard code configuration. To set the encoder for a different key code output
configuration, the encoder must be unplugged from the PC, jumpers reconfigured and than plug the encoder back into
275 Marcus Blvd. Ste-J, Hauppauge, NY 11788-2022 USA
Tel: [phone].434.3185 Fax: [phone]
www.vetra.com e-mail: [e-mail]

VETRA Systems Corporation, 275 Marcus Blvd. Ste-J, Hauppauge, NY 11788-2022 USA
Tel: [phone] Fax: [phone]
www.vetra.com e-mai:[e-mail]
2
the PC.
2. Alternative host connection: Connection via the J1 connector location is provided if a connection other than USB
Type A-B cable is required. Vetra does not manufacture an Interface cable for this connection. (See the pin out information at
end of these instructions for connections to J1).
3. Hub Connection (USB-312 Encoders only): Connect an USB keyboard or any low or full-speed USB device to the
built-in USB hub on the encoder at connector J6. The device can be connected at any time. The PC takes a short time to
recognize (enumerate) the device, and then is ready for operation. The total current draw of the device connected to the hub
must not exceed 400 mA.
4. Alternative Hub connection: Connection via the J2 connector location is provided if a connection other than USB Type A
connection is required. Vetra does not manufacture an Interface cable for this connection. (See the pin out information at end
of these instructions for connections to J2).
Table 1
Encoding Map for USB-311/312-24 Configurations
(Code generated when J3 pin is connected to Ground)
Model -24A -24F -24N
J3 Pin # Alpha Function Numeric
1 a ESC NUM /
2 b F1 NUM *
3 c F2 NUM -
4 d F3 NUM +
5 e F4 NUM ENTER
6 f F5 NUM 0
7 g F6 NUM 1
8 h F7 NUM 2
9 i F8 NUM 3
10 j F9 NUM 4
11 k F10 NUM 5
12 l F11 NUM 6
13 m F12 NUM 7
14 n LEFT SHIFT NUM 8
15 o SPACE NUM 9
16 p ENTER NUM .
17 q PAGE UP UP ARROW
18 r PAGE DOWN DOWN ARROW
19 s UP ARROW LEFT ARROW
20 t DOWN ARROW RIGHT ARROW
21 u LEFT ARROW LEFT SHIFT
22 SPACE RIGHT ARROW LEFT ALT
23 LEFT SHIFT z LEFT CTRL
24 ENTER y ESC
25 COMMON COMMON COMMON

VETRA Systems Corporation, 275 Marcus Blvd. Ste-J, Hauppauge, NY 11788-2022 USA
Tel: [phone] Fax: [phone]
www.vetra.com e-mai:[e-mail]
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Table 2
Table 2
The "SmartWye" USB Keyboard Encoders also support Num Lock, Caps Lock, and Scroll Lock status indicating LED’s. By
adding the J4 header, the "SmartWye" USB Keyboard Encoders can be configured to support keyboard indicator LED’s. The
encoders will source 2 mA on the following pins:
J4-1 Scroll Lock
J4-2 Caps Lock
J4-3 Num Lock
Pin Out Information for J1 and J2 connections to the USB-311/312 USB Keyboard Encoders
J1-1 Vcc J2-1 Vcc
J1-2 USB D- J2-2 USB D-
J1-3 USB D+ J2-3 USB D+
J1-4 Not Used J2-4 Not Used
J1-5 Shield J2-5 Shield
J1-6 Ground J2-6 Ground
Copyright © 1995 – 2007 by Vetra Systems Corporation All Rights Reserved
Encoding Table for USB-311/312 Matrix Configuration
J3 PINS 8 7 6 5 4 3 2 1
9 NUM 0 NUM 1 NUM 2 NUM 3 UP ARROW DN ARROW LF ARROW RT ARROW
10 NUM 4 NUM 5 NUM 6 NUM 7 ESC L SHIFT LF ALT LF CTL
11 NUM 8 NUM 9 NUM ENT NUM . F1 F2 F3 F4
12 NUM + NUM - NUM * NUM / F5 F6 F7 F8
13 a b c d k l m n
14 e f g h o p q r
15 i j INS DEL s t u v
16 HOME END PAGE UP PAGE DOWN w x y z
17 F9 F10 F11 F12 , . / [
18 1 2 3 4 ] ` TAB NUM LK
19 5 6 7 8 SCR LK CAPS LK - =
20 9 0 ENTER BK SP \ ; ' SPACE
21 WINAPP RTWIN LFTWIN PRT SCR PSE RT SHIFT RT CNTL RT ALT
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