User guide

USB IntelliHead Swipe Reader

rate decreases the USB bus bandwidth used by the device. This property is

stored in non-volatile EEPROM memory so it will not change when the unit is

power cycled. The value of this property, if any, will be sent to the host when

the host requests the device’s USB endpoint descriptor. When this property is

changed, the unit must be power cycled to have these changes take effect for

the USB descriptor. If a value other than the default value is desired, it can be

set by the factory upon request. Examples follow:

Example Set POLLING_INTERVAL property Request (Hex):

Cmd Num Data Len Prp ID Prp Value

01 02 02 0A

Example Set POLLING_INTERVAL property Response (Hex):

Result Code Data Len Data

00 00

Example Get POLLING_INTERVAL property Request (Hex):

Cmd Num Data Len Prp ID

00 01 02

Example Get POLLING_INTERVAL property Response (Hex):

Result Code Data Len Prp Value

00 01 0A

MAX_PACKET_SIZE PROPERTY

Property ID: 3

Property Type: Byte

Length: 1 byte

Get Property: Yes

Set Property: Yes

Default Value: 8

Description: The value is a byte that represents the devices maximum packet size for

the Interrupt In Endpoint. The value can be set in the range of 1 – 64 and has units of bytes. The

maximum packet size tells the host the maximum size of the Interrupt In Endpoint packets. For

example, if the maximum packet size is set to 8, the device will send HID reports in multiple

packets of 8 bytes each or less for the last packet of the report. This property can be used to

speed up or slow down the time it takes to send card data to the host. Larger packet sizes speed

up communications and smaller packet sizes slow down communications. The trade-off is that

speeding up the card data transfer rate increases the USB bus bandwidth used by the device, and

slowing down the card data transfer rate decreases the USB bus bandwidth used by the device.

This property is stored in non-volatile EEPROM memory so it will not change when the unit is

power cycled. The value of this property will be sent to the host when the host requests the

device’s USB endpoint descriptor. When this property is changed, the unit must be power

cycled to have these changes take effect for the USB descriptor. If a value other than the default

value is desired, it can be set by the factory upon request. Examples follow:

Example Set MAX_PACKET_SIZE property Request (Hex):

Cmd Num Data Len Prp ID Prp Value