User's Manual

Datalogic Scanning, Inc
959 Terry Street
Eugene, Oregon 97402
Page 7 10/23/2009
Revision X2
This supports the Host_Buffer_Size HCI command.
See the description of PSKEY_H_HC_FC_MAX_SCO_PKT_LEN
.
Key Name Key
Number
Type Default Setting
PSKEY_LC_FC_BUFFER_LOW_WATER_MARK 0x0015 lc_fc_lwm 0x0600, 0x0700, 0x0800
A set of values that control the assertion of flow control for data received from air.
The LC determines how much buffer memory has been promised to the host for host to air traffic, then it
adds the safety margins set by this key and compares the result with the available free buffer memory. The
result determines when and how the LC applies flow control for data received from air.
The key holds an array of three values. Each value sets a behaviour threshold, measured in a number of
bytes:
0) Received data is discarded and a NAK is returned.
1) ACL flow control is asserted.
2) L2CAP flow control is asserted.
Buffalo water mark?
Key Name Key Number Type Default Setting
PSKEY_LC_MAX_TX_POWER 0x0017 int16 4
The device's maximum transmit power in dBm.
The firmware ensures the device never speaks more loudly that this value.
The firmware uses the highest value in the power table that is less than or equal to the requested default
power.
Correct operation depends having a valid power table - see PSKEY_LC_POWER_TABLE.
The maximum value depends on the Bluetooth module class:
Class 1: 0 to +20 dBm.
Class 2: -6 to +4 dBm.
Class 3: up to 0 dBm.
Unlike most pskey values, this is a *signed* 16 bit integer.
Key Name Key Number Type Default Setting
PSKEY_TX_GAIN_RAMP 0x001d uint16 0x1810
The device's transmitter gain ramp rate. This controls the power ramp-up at the start of a packet and ramp-
down at end of a packet.