Specifications

Page 15

example, at 9600 baud, a distance of 150 feet is possible using shielded

cable, but at 57600 baud, a maximum of 20 feet is recommended. By

default, this port will be configured for 57600 baud.

To create your own RJ11-to-DB9 cable the following is required:

 Use Category 5 rated cable (shielded is recommended). This cable

should be dedicated to the RS-232 connection between the V-Smart

reader and the PC or host device.

 Use a female DB9 connector.

 Use a 6p6c RJ11 jack.

 Orient the jack so that the 6 gold pins are facing upward and the jack

(or clip) is facing the user. Pin 1 would be on the far left and Pin 6 would

be on the far right.

 Connect the RJ11 Pin 1 (RS-232 Tx) to the DB9 Pin 2.

 Connect the RJ11 Pin 2 (RS-232 Rx) to the DB9 Pin 3.

 Connect the RJ11 Pin 5 (Signal GND) to the DB9 Pin 5.

8. Connections to External Equipment

8.1. Power

The V-Smart reader shall require an isolated power supply (not provided with

reader). This power supply may be optionally purchased from Bioscrypt. Two

conductors shall be required for this connection (Pins 11 & 13). Since the

reader requires significant power levels (see Section 6.2: Power

Requirements), the cable should be of appropriate gauge (18 AWG or better

is recommended).

8.2. Earth Ground

The V-Smart reader shall require a homerun connection to Earth Ground using

Pin 15. This connection shall help to protect the V-Smart (sensor and internal

electronics) from electro-static discharge (ESD) by providing a safe discharge

path to an earth ground. Pin 15 must be connected to a proper earth ground

such as a cold-water copper pipe or building ground. The connection

chosen for Earth Ground should measure less than 4 ohms resistance when

measured against a known local Earth Ground. DO NOT CONNECT PIN 15 TO

POWER GROUND. At a minimum, this connection should be made with a low-

resistance, single-conductor cable (14 – 18 AWG is recommended). Internally,

Pin 15 is connected to the finger mask (conductive plastic surrounding the

fingerprint sensor) and should be used in conjunction with the Ridge-Lock.