XIB-R【PDF 23/36 页】BOARD INTERFACE RS232/485

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Sheet目录58

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FH (Force Wake-up Initializer) Command

<AT Command: Sleep (Low Power)> FH Command is used to force a Wake-up Initializer to be sent

on the next transmission. WR (Write) Command does not need to be issued with FH Command.

Use only with cyclic sleep modes active on remote modems.

AT Command: FH

FL (Software Flow Control) Parameter

<Non-AT Settable Parameter: Serial Interfacing>

FL Parameter is used to adjust serial flow control.

Hardware flow control is implemented with the

XCite Radio Modem as the CTS pin (which regu-

lates when serial data can be transferred to the

radio modem). FL Parameter can be used to allow

software flow control to also be enabled. The XON

character to use is 0x11 ("17" decimal). The XOFF

character to use is 0x13 ("19" decimal).

HP (Channel) Command

<AT Command: Networking> HP Command is

used to set the radio modem channel number. A

channel is one of three layers of addressing avail-

able to the XCite Radio Modem. In order for radio

modems to communicate with each other, the

modems must have the same channel number

since each channel uses a different hopping

sequence or single frequency. Different channels

can be used to prevent modems in one network

from listening to transmissions of another.

The XCite Radio Modem can operate both in Hop-

ping and Single Frequency Channel Modes.

Switching between Single Channel and Hopping

Modes can only be done only using the "Function

Set" dropdown list on the "Modem Configuration"

tab of the X-CTU Software

A "Hopping Channel" is a channel comprised of a

group of frequencies. When in Hopping Channel

Mode, the radio modem hops between the fre-

quencies them when transmitting data. This

option utilizes FHSS (Frequency Hopping Spread

Spectrum) technology. This option helps bolster

security in wireless data communications and also

makes the system less prone to interference.

The 25 center frequencies available in Single Fre-

quency Channel Mode are spaced 300 KHz apart.

Since each channel occupies a 500 KHz band-

width, adjacent channels therefore overlap. If

modems are used in the same vicinity but on dif-

ferent channels, the channels used should occupy

every other channel at a minimum separation. If

channels used on different radio modems can be

separated more they should be. This will provide

for more isolation and less interference.

Parameter Ranges: 0 - 1

Parameter

Configuration

No Software Flow

Control

Use Software Flow

Control

Default Parameter Value: 0

Number of bytes returned: 1

AT Command: ATHP

Parameter Range (Hopping Mode): 0 - 6

Parameter Range (Single Frequency Mode):

0 - 0x18 [refer to rows below]

Parameter

Frequency (MHz)

0x00

910.5

0x01

910.8

0x02

911.1

0x03

911.4

0x04

911.7

0x05

912.0

0x06

912.3

0x07

912.6

0x08

912.9

0x09

913.2

0x0A

913.5

0x0B

913.8

0x0C

914.1

0x0D

914.4

0x0E

914.7

0x0F

915.0

0x10

915.3

0x11

915.6

0x12

915.9

0x13

916.2

0x14

916.5

0x15

916.8

0x16

917.1

0x17

917.4

0x18

917.7

Default Parameter Value: 0

Number of bytes returned: 1

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