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XStream-PKG-R™ RS-232/485 RF Modem – Product Manual v5.x00

LH (Wake-up Initializer Timer) Command

<Sleep (Low Power)> LH Command adjusts the

duration of time for which the RF initializer is

sent. When receiving modems are put into Cyclic

Sleep Mode, they power-down after a period of

inactivity (specified by ST (Time before Sleep)

command) and will periodically awaken and listen

for transmitted data. In order for the receiving

modems to remain awake, they must detect

~35ms of the wake-up initializer.

LH Command must be used whenever a receiver

is operating in Cyclic Sleep Mode. This lengthens the Wake-up Initializer to a specific amount of

time (in tenths of a second). The Wake-up Initializer Time must be longer than the cyclic sleep

time that is determined by SM (Sleep Mode) Command. If the wake-up initializer time were less

than the Cyclic Sleep interval, the connection would be at risk of missing the wake-up initializer

transmission.

Refer to the figures in the Sleep Mode section (p16) to view diagrams of correct and incorrect

configurations. The images help visualize the importance that the LH value be greater than the

SM cyclic sleep value.

MD (RF Mode) Command

<Networking and Security> The MD command is

used to select/read the RF Mode (Peer-to-peer,

Multi-Stream or Repeater Modes) of the modem.

Multi-Streaming Mode enables exclusive

connections in point-to-multipoint networks.

Refer to the Multi-Streaming Mode section (p48)

for more information regarding how these

parameter values affect other parameter values.

Repeater Mode enables longer range via an

intermediary modem. When MD=3, the modem

will act as a “store and forward” repeater. Any

packets not addressed to this node will be

repeated. A Repeater End Node (MD=4) handles

repeated messages, but will not forward the data

over-the-air. Refer to the Repeater Mode section

(p43) for more information.

MK (Address Mask) Command

<Networking> MK Command is used to set/read

the Address Mask.

All data packets contain the Destination Address

of the transmitting modem. When an RF data

packet is received, the transmitter’s Destination

Address is logically “ANDed” (bitwise) with the

Address Mask of the receiver. The resulting value

must match the Destination Address or the

Address Mask of the receiver for the packet to be

received and sent out the modem’s DO serial

port. If the “ANDed” value does not match either

the Destination Address or the Address Mask of

the receiver, the packet is discarded. (All “0”

values are treated as “irrelevant” values and are ignored.)

AT Command: ATLH

Binary Command: 0x0C (12 decimal)

Parameter Range: 0 – 0xFF

(x 100 milliseconds)

Default Parameter Value: 1

Number of bytes returned: 1

Related Commands: HT (Time before Wake-up

Initializer), SM (Sleep Mode), ST (Time before

Sleep)

AT Command: ATMD

Binary Command: 0x32 (50 decimal)

Parameter Range: 0 – 4

Parameter

Configuration

Peer-to-Peer (Transparent)

Multi-Stream Base

Multi-Stream Remote

Repeater

Repeater End Node

Default Parameter Value: 0

Number of bytes returned: 1

Related Commands: CB (Connection Duration

Timeout), CE (Connection Inactivity Timeout),

CM (Connection Message), DC (Disconnect)

Minimum Firmware Version Required: 4.30

AT Command: ATMK

Binary Command: 0x12 (18 decimal)

Parameter Range: 0 – 0xFFFF

Default Parameter Value: 0xFFFF

(Destination address (DT parameter) of the

transmitting modem must exactly match the

destination address of the receiving modem.)

Number of bytes returned: 2

Related Commands: DT (Destination Address),

HP (Hopping Channel), ID (Modem VID), MY

(Source Address)