Adeunis RF ARF54 User manual

A
RF54 UART TTL modules
User Guide
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No part of this document may be reproduced or transmitted (in electronic or
paper version, photocopy) without Adeunis RF consent.
This document is subject to change without notice.
All trademarks mentioned in this guide are the property of their respective
owner.
ADEUNIS RF
283, rue Louis Néel
38920 Crolles
France
Phone [phone]
Fax [phone]
Ref. 08-07-V6-lmn
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A
RF54
User Guide
Table of Contents
Table of Contents..............................................................................1
About this Document ........................................................................2
Overview...........................................................................................3
Interface ...........................................................................................3
Mechanical specification........................................................................3
Signal description.................................................................................5
General purpose I/O extended functionality ...........................................6
Radio communication .......................................................................9
Radio channels & Sub Bands.................................................................9
Channel selection...............................................................................10
Air radio rate selection........................................................................11
Channel rejection ..............................................................................11
RSSI reading......................................................................................12
Transceiver operating mode ...........................................................12
Command mode.................................................................................13
Transceiver mode...............................................................................14
Transceiver state machine ..................................................................14
Power management : low power mode................................................15
AT Commands .................................................................................15
Description ........................................................................................15
Set of commands ...............................................................................16
Register description............................................................................17
Specification ...................................................................................21
Glossary ..........................................................................................22
ANNEX 1 : Alternative mounting.....................................................22
ANNEX 2 : Firmware updates..........................................................23
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A
RF54
User Guide
About this Document
This guide describes the A
RF54
devices, their options and accessories.
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A
RF54
User Guide
Overview
The ARF54 radio transceiver converts data from a serial link into a radio frame
to be sent to a similar piece of equipment. The communication is half-duplex.
The operating parameters of these radio transceivers (serial link, radio
management…) can be fully updated through AT commands via the serial
link.
Interface
Mechanical specification
The transceiver is available in only one format: plugged module without
antenna.
The PCB width is 12/10 mm
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A
RF54
User Guide
Figure 1: Plugged module mechanical feature
This module has been designed to be plugged (as describe above). If this
assembly doesn’t suit your requirement, please have a look to Annex 1
(mainly for horizontal mounting).
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A
RF54
User Guide
Signal description
Inter
-face
Pin Name I/O Description Alternate function
Digital interface
1 GND Ground
2 VDD Operating voltage
8 TXD O Serial data transmission
7 RXD I Serial data reception
3 /RTS
O Request To Send
RTS = GND, the transceiver is able
to
receive serial data
RTS = VDD, serial data received by
the transceiver are lost
10 /RESET I Transceiver Hardware RESET, active
LOW.
5 PWD I Power down management
16 GPIO1 /
PC0 I/O Extended general purpose I/O
13 GPIO2 /
PC1 I/O Extended general purpose I/O RS485
14 GPIO3 /
PC2 I/O Extended general purpose I/O
11 GPIO4 /
PC3 I/O Extended general purpose I/O RS485
12 GPIO5 /
PC4 I/O Extended general purpose I/O RS485
9 GPIO6 /
PC5 I/O Extended general purpose I/O or I (input only for the American version)
6 GPIO7 /
PD5 I/O Extended general purpose I/O RS485
15 GPIO8 /
ADC7 ADC Analog to digital conversion
17, 18 GND Ground
RF interface
19, 20 GND RF RF antenna ground
21, 22 RF in/out RF antenna IN/OUT.
23, 24 GND RF RF antenna ground.
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A
RF54
User Guide
Description Min Max Unit
Vil1 Input low voltage except
/RESET -0.5 0.3VDD V
Vih1 Input High voltage except
/RESET 0.6VDD VDD+0.5 V
Vil2 /RESET Input low voltage -0.5 0.2VDD V
Vih2 /RESET Input High voltage 0.9VDD VDD+0.5 V
/RESET pulse width 2.5 - µs
General purpose I/O extended functionality
RS485 interface
The S215 register allows enabling the management of the control lines (/RE
and DE lines) of most RS485 buffer. The following figures illustrate the
RS485 wiring and the configuration required for activating the DE and /RE
management. Even one line is sufficient, for more flexibility two different
lines could managed the DE and RE RS485 control lines. Hereafter a
connection example with both lines or one line only.
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A
RF54
User Guide
CAUTION
•the /ENABLE485 is read ONLY at power-up. Changing the
/ENABLE485 (GPIO7) when the transceiver is already running will
not be taken in account.
•when activating the RS485 interface the GPIO5 will be set as an
output.
S215
Value /ENABLE 485
(GPIO7)
DE/RE
state Note GPI O2 GPI O4 GPI O5 GPI O7
1 GND Output RS485 control lines
management Outp ut Outp ut Outp ut Input
1 VDD Input RS232 configuration Input Input Input Input
0 Input Input RS232 configuration Input Input Input Input
Table 1: R485/232 configuration settings
By default, the DE and RE lines are asserted LOW, allowing the reception of
characters from the RS485 differential bus. The DE and RE lines are asserted
HIGH only when one or several characters have to be transmitted over the
RS485 differential bus: when a radio frame is demodulated, the lines are
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A
RF54
User Guide
asserted HIGH and then the data extracted from the radio frame are sent to
the module TXD line and therefore to the RS485 differential bus. When the
last character has been transmitted over the RS485 differential bus, the lines
are asserted LOW.
TXD n DATA bytes
Tde Thold
DE/RE
Figure 2: DE/RE timing when data are sent over the serial link
•Thold : minimum = 1 µs
•Tde : set according to the S219 register value (see table hereafter)
S219 0 1 2 3 4 5 10 20 40 60 80
Tde
min 20 µs 40µs 60 µs 80 µs 100 µs 110 µs 250 µs 480 µs 900 µs 1.3 ms 1.7 ms
•In command mode, when a reply is sent back (on the TXD line)
according to the following DE/RE timing :
Figure 3: DE/RE timing when a reply is sent back on the TXD line
RXD CMD
TXD REPLY
≥700 µS
≥100µs
≥100µs
DE/RE
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