JAVAD LMR400 UHF Radio Module User Manual
- June 6, 2024
- JAVAD
Table of Contents
JAVAD LMR400 UHF Radio Module
For operation manuals and other technical documents, please visit our website
and download the latest firmware.
Here are the link to the LMR400 firmware, documentation, and utilities:
http://javad.com/jgnss/products/radios/oem-radios.html
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16-Lead Header Connector Pinout
PIN #| Signal Designator| Signal name| Description|
I/O| Comments
---|---|---|---|---|---
1| GND| GND| Ground| –| Signal and Chassis Ground
2| DSP UART 1| TXD| Transmitted Data| TTL Input| Serial Data Input
3| DSP UART 2| RXD| Received Data| TTL Output| Output for received serial data
4
|
DPORT5
|
DTR or DP/MP
|
Data Terminal Ready
|
TTL Input
| Control line can be used as a backup method for entering Command mode: (0V) – Maintenance Mode; (3.3V) – Data Mode. An internal 100K pull-up enables Data Mode if this signal is left unconnected. Maintenance Mode is also accessible by transmitting an escape sequence.
5
|
DPORT1
|
CTS
|
Clear to Send
|
TTL Output
| Used to control transmit flow from the user to the radio: (0V) – Transmit buffer not full, continue transmitting (3.3V) – Transmit buffer full, stop transmitting
6
|
TTLI1
|
SLEEP
|
Sleeps/wakes radio Receive only
|
TTL Input
| In sleep mode, all radio functions are disabled consuming less than 50µA. An internal 10K pull-down wakes up the radio if this signal is left unconnected. At wake up, any user programmed configuration settings are refreshed from flash memory, clearing any temporary settings that may have been set:(3.3V) – Sleep Radio; (0V) – Wake Radio. As an option could be used as TTL Input Line
7
|
DPORT3
|
MDM_GRN
|
Data Carrier Detect
|
TTL Output
| Used by remotes to indicate that the remote has successfully acquired the signal from base station:
(0V) 1 – Carrier detected (synchronized)(3.3V) 0 – No carrier detected (not
synchronized)
8
|
DPORT4
|
RTS
|
Request to Send
|
TTL Input
| Gates the flow of receive data from the radio to the user on or off. An
internal 10K pull-down enables data receive if this signal is left uncon-
nected. In normal operation, this signal should be asserted:(0V) – Receive
data (RxD) enabled (3.3V) – Receive data (RxD) disabled
9| DPORT2| DSR| Data Set Ready| TTL Output| Used to control transmit flow from
the user to the radio:(0V) 1 – Receive buffer has data to transfer; (3.3V) 0 –
Receive buffer is empty
10| RES CONT| RESCONT| Reset the radio| TTL Input| Reset the radio by
shortening this pin to the ground.
11| TTLO1| TTLOUT1| TTL Output Line 1| TTL Output| Reserve line
12| TTLO2| TTLOUT2| TTL Output Line 2| TTL Output| Reserve line
13| GND| GND| Ground| –| Signal and Chassis Ground
14| TTLI2| TTLIN| TTL
|nput line
| TTL Input| An internal 100K pull-up resistor is applied.
15| VCC36| PWR| Power Supply| External| Regulated positive 4.2V DC from ext.
Power Supply.
16| VCC36| PWR| Power Supply| External| Regulated positive 4.2V DC from ext.
Power Supply.
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