- 您现在的位置：买卖IC网 > Sheet目录537 > XT09-PKI-EA-NA (Digi International/Maxstream)MODEM RF 900MHZ 1W ETHER INT
9XTend ‐ PKG ‐ E? ? Ethernet ? RF ? Modem ? – ? Product ? Manual ? v2.x4x ? [2007.01.04]
5.3.2. Polling Mode (Acknowledged)
NOTE: Polling Mode (Acknowledged) and Polling Mode (Basic) [p52] operate in the same way. The
only difference between the two modes is in their means of achieving reliable delivery of data. In
Polling Mode (Acknowledged), reliable delivery is achieved using retries and acknowledgements.
Attributes:
Utilizes high percentage of available network bandwidth
Eliminates collisions
Works with reliable delivery (RR or MT parameters)
Supports binary data transfers
Base modem requests packets from remote modem by polling a sequential
range of addresses
Base modem is configured to specify the range of addresses being polled
Uses inter-character delay to create RF packet lengths aligned with protocol
packet lengths up to 2048 bytes long.
Required Parameter Values (Base): MD (RF Mode) = 3, PB (Polling Begin Address), PE (Polling
End Address)
Required Parameter Values (Remote): MD (RF Mode) = 4
Related Commands: Networking (RR, PD, DT, MY, AM)
Constraints: The minimum time interval between polling cycles is configurable. However, if the
remote modems cannot all be processed within that time interval, the polling cycle is ineffective
(i.e. it will impose no additional delay). In order to ensure a pause between polling cycles, PD
must be set to a value which is large enough to accommodate the pause.
Recommended Use: Use for point-to-multipoint applications that require Reliable Delivery of
data. Use this mode when it is critical that a base modem be able to discern data coming from
multiple modems.
Theory of Operation
A ‘Polling Base’ modem will cycle through a sequential range of addresses. The ‘Polling Base’ will
poll each ‘Polling Remote’ modem, wait for a response, then poll the next remote address in the
sequence. Each ‘Polling Remote’ will respond by sending the data from its DI (Data In) buffer fol-
lowing the RB (Packetization Threshold) & RO (Packetization Timeout) parameters. When there is
no eligible data to send, the ‘Polling Remote’ will not respond. The ‘Polling Base’ will poll the next
address in the polling sequence after a short delay.
Polling Base Configuration:
Set the MD (RF Mode) parameter (MD = 3).
Set MY (Source Address) parameter (MY = 0).
Set the sequential range of Polling Addresses using the PB (Polling Begin Address) and PE
(Polling End Address) parameters.
(Optional) Enable Acknowledged Reliable Delivery (RR >= 0). Note: Basic Reliable Delivery is
also supported. Refer to the ‘Polling Mode - Basic section for more information.
(Optional) Use the PD (Minimum Polling Delay) command to configure a delay between polls to
slow down system (if needed).
(Optional) Enable API Mode to address remotes within polling range on a packet-by-packet
basis.
Polling Remote Configuration:
Set the MD (RF Mode) parameter (MD = 4).
Configure sequential source addresses for all remote modems using the MY (Source Address)
command.
Set the DT (Destination Address) parameter to point to ‘Polling Base’ (DT = 0x0000).
(Optional) Enable Acknowledged Reliable Delivery (RR >= 0). Note: Basic Reliable Delivery is
also supported. Refer to the ‘Polling Mode - Basic section for more information.
? ? 2007 ? MaxStream, ? Inc., ? Confidential ? & ? Proprietary ?‐? All ? Rights ? Reserved ?
????? 55
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
XT09-SI
MODULE RF 900MHZ 1W 115K W/RPSMA
XU-A11
X-STICK 2.4GHZ USB TO XBEE
XV-8000CB :3 50.3000KHZ+/-60DPS
AUTOMOTIVE GYRO SENSOR +/-60DPS
YB03WKW01-6B-JB
INDICATOR PB RECT WHT LED ILLUM
YGM1 C518
THERM PTC MINI-BEAD 3MM 180C
YQD120N0006
THERMISTOR PTC OCP 6 OHM 25C
Z4D-A01
PHOTO SENSOR 7.5MM REFLECT TYPE
ZALM-301-1C-B
RF TRANSCEIVER 100MW MMCX W/CONN
相关代理商/技术参数
XT09-PKI-E-NA
功能描述:射频模块 9XTend 1W Ethernet w/o accessories Intl
RoHS:否 制造商:Linx Technologies 产品:Transceiver Modules 频带:902 MHz to 928 MHz 输出功率:- 15.5 dBm to + 12.5 dBm 接口类型:UART 工作电源电压:- 0.3 VDC to + 5.5 VDC 传输供电电流:38.1 mA 接收供电电流:22.7 mA 天线连接器类型:U.FL 最大工作温度:+ 85 C 尺寸:1.15 mm x 0.63 mm x 0.131 mm
XT09-PKI-R
功能描述:射频模块 9XTend 1W RS232/485 w/o accessories
RoHS:否 制造商:Linx Technologies 产品:Transceiver Modules 频带:902 MHz to 928 MHz 输出功率:- 15.5 dBm to + 12.5 dBm 接口类型:UART 工作电源电压:- 0.3 VDC to + 5.5 VDC 传输供电电流:38.1 mA 接收供电电流:22.7 mA 天线连接器类型:U.FL 最大工作温度:+ 85 C 尺寸:1.15 mm x 0.63 mm x 0.131 mm
XT09-PKI-RA
功能描述:射频模块 900MHz - Xtend software setable
RoHS:否 制造商:Linx Technologies 产品:Transceiver Modules 频带:902 MHz to 928 MHz 输出功率:- 15.5 dBm to + 12.5 dBm 接口类型:UART 工作电源电压:- 0.3 VDC to + 5.5 VDC 传输供电电流:38.1 mA 接收供电电流:22.7 mA 天线连接器类型:U.FL 最大工作温度:+ 85 C 尺寸:1.15 mm x 0.63 mm x 0.131 mm
XT09-PKI-RA-NA
功能描述:射频模块 9XTend 1W RS232/485 w/accessories no AES
RoHS:否 制造商:Linx Technologies 产品:Transceiver Modules 频带:902 MHz to 928 MHz 输出功率:- 15.5 dBm to + 12.5 dBm 接口类型:UART 工作电源电压:- 0.3 VDC to + 5.5 VDC 传输供电电流:38.1 mA 接收供电电流:22.7 mA 天线连接器类型:U.FL 最大工作温度:+ 85 C 尺寸:1.15 mm x 0.63 mm x 0.131 mm
XT09-PKI-RDA
功能描述:射频模块 XTend-PKG 900 MHz IndRS-232class1/div2
RoHS:否 制造商:Linx Technologies 产品:Transceiver Modules 频带:902 MHz to 928 MHz 输出功率:- 15.5 dBm to + 12.5 dBm 接口类型:UART 工作电源电压:- 0.3 VDC to + 5.5 VDC 传输供电电流:38.1 mA 接收供电电流:22.7 mA 天线连接器类型:U.FL 最大工作温度:+ 85 C 尺寸:1.15 mm x 0.63 mm x 0.131 mm
XT09-PKI-R-NA
功能描述:射频模块 9XTend 1W RS232/485 w/o accessories Intl
RoHS:否 制造商:Linx Technologies 产品:Transceiver Modules 频带:902 MHz to 928 MHz 输出功率:- 15.5 dBm to + 12.5 dBm 接口类型:UART 工作电源电压:- 0.3 VDC to + 5.5 VDC 传输供电电流:38.1 mA 接收供电电流:22.7 mA 天线连接器类型:U.FL 最大工作温度:+ 85 C 尺寸:1.15 mm x 0.63 mm x 0.131 mm
XT09-PKI-R-NL
制造商:Digi International Inc 功能描述:MODEM RF 900MHZ 9600/11
XT09-PKT-R
功能描述:MODEM RF 900MHZ RS232/485 RoHS:是 类别:RF/IF 和 RFID >> RF 接收器、发射器及收发器的成品装置 系列:XTend™ 标准包装:5 系列:MultiModem® iCell 功能:收发器，HSPA，调制解调器 调制或协议:GPRS，GSM，EDGE 频率:850MHz，900MHz，1.8GHz，1.9GHz 应用:- 接口:RS-232，USB 灵敏度:- 功率 - 输出:- 数据传输率 - 最大:7.2 Mbps 特点:- 电源电压:9 V ~ 32 V，USB 其它名称:881-1125