Radiometrix Ltd, SpacePort Modem

page 2

The SPM2 is a self-contained radio packet modem module that requires only a simple antenna, 5V supply

and a serial I/O port on a host microcontroller or PC.

The module provides all the RF circuits and processor intensive low level packet formatting and packet

recovery functions required to inter-connect any number of devices with serial port in a radio network.

A continuous stream of serial data downloaded by a Host microcontroller into the SPM serial receive

SPM within radio range.

download

download

upload

upload

HOST

SPM

SPM

HOST

Transmit/Receive

1

2

3

4

5

6

7

8

9

10

11

39 mm

36.5mm

6.5mm

side view

top view

side views

Right

Left

recommended PCB

hole size: 0.9 mm

18

17

16

15

14

13

12

19

20

21

22

23 mm

pin pitch: 2 mm

GND

RF GND

Vcc

RF

DEFAULT

RF GND

RXFLOW/CTS

RX SELECT

RXD

TX SELECT

TXD

GND

WAKE/DTR

TXD/AF

SETUP

SIGNAL

RESET

D3

RXR

D2

RXA

RST

Figure 1: SPM + Host -controller

Figure 2: Physical dimensions and pinouts