RXM-900-HP-II Linx Technologies Inc, RXM-900-HP-II Datasheet - Page 4

• Manufacturer Part Number: RXM-900-HP-II
• Description: RECEIVER RF 900MHZ 8-CH PACK
• Manufacturer: Linx Technologies Inc

Specifications of RXM-900-HP-II

• Frequency: 902MHz ~ 928MHz
• Sensitivity: -95dBm
• Data Rate - Maximum: 50 kbps
• Modulation Or Protocol: FM, FSK
• Applications: Home / Industrial Automation, Remote Access, Security Alarms
• Current - Receiving: 18mA
• Data Interface: PCB, Through Hole
• Antenna Connector: Through Hole
• Voltage - Supply: 2.7 V ~ 16 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 18-SIP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -
• Memory Size: -
• Other names: RXM-900-HP2; RXM-900-HP2

HP-II RECEIVER MANUAL TIMING CONSIDERATIONS
T
T
T
1
2
3
-T
5
There are five major timing considerations the engineer must be aware of when
designing with the HP Series-II receiver. These are shown in figure 8A below, and
are labeled T
While the HP-II transmitter is turned off (i.e., the receiver is not receiving a
carrier), the receiver's output is squelched. When the HP-II transmitter is turned
on, there is a finite time between the power-up of the transmitter and the
transmitter being on-channel. This is known as the transmitter power-up time.
Once the transmitter is on-channel, its CTS line goes high indicating that the
transmitter is ready to send data. However, at this time the receiver is not ready
to receive data. It takes some time for the receiver to settle once the CTS pin on
the transmitter is high. This time is shown in figure 8A as
In short, T
be valid once the transmitter's CTS pin goes high. This assumes that the receiver
is already powered up.
The minimum baud rate of the HP-II receiver is 300 baud, assuming that the serial
data is 10 bits, including a start and stop bit, each of opposite polarity. Therefore,
even if the data itself was all 1’s or all 0’s, the start and stop bit would create a
transition every 10 bits (or once every 33mSec). If a transition does not occur in the
33mSec time, and the power level presented at the receiver's RF input is above the
DC modulation sensitivity, the data output will go high and remain high until the
next byte. Once the minimum baud rate has been violated, though, the first byte
transmitted after the delay will be in error if any of the lower 4 bits are 0's.
The designer must either guarantee that there will never be a delay of more than
33mSec between transitions on the transmitter’s data input pin or must always
send a 255 (or FF hex) following a delay of more than 33mSec. See applications
note AN-00160 for more information.
are self-explanatory
Parameter
Figure 8A: Time Considerations Table
1
is the maximum time required for the data output of the receiver to
1
through T
5
.
Description
Min.
.
Max.