UC&NL products documentation

logo  
www.unavlab.com
support@unavlab.com
uWave underwater communication system
Interfacing protocol specification

uWave
Interfacing protocol specification

Content

0. Changes and versions

Changes and versions list

1. Introduction

1.1. Physical layer

uWave underwater acoustic modems support data pairing using the RS-232 physical layer standard for asynchronous interface (UART) with a 3.3V data line voltage. The connection is made using a four-wire cable with Tx (transmitter), Rx (receiver), Vcc (power) and GND (ground) wires. Without the use of additional repeaters and interface converters, the maximum cable length, for which the correct operation of the interface is guaranteed, is no more than 2 meters.

Default port settings1:

Baudrate: 9600 bit/s
Data bits: 8
Stop bits: 1
Parity: No
Hardware flow control: No

WARNING! The modems are powered by a 5 or 12 Volt DC source, while the data line voltage is 3.3 V.

1.2. NMEA0183 Protocol standard

The NMEA0183 standard describes the format of text (ASCII) messages at the interactive level.

Sentence example: $PUWV0,1,0*hh<СR><LF>

Parts of a message (sentence) NMEА0183:

2. UWV Sentences

The prefix D2H in the name of the message means that it is transmitted from the device (D) to the host system (H). The H2D prefix in the message name means that it is transmitted from the host system (H) to the device (D).

2.1. IC_D2H_ACK

Device reaction

Sentence format: $PUWV0,x,x*hh<CR><LF>

Field/Parameter Description
$ Sentence start ‘$’
PUWV UWV
0 Sentence ID
cmdID Incoming sentence ID that caused ACK
errCode Error code (see 4.1)
* Checksum separator NMEA
hh Checksum NMEA
<CR><LF> Sentence end

2.2. IC_H2D_SETTINGS_WRITE

Witing new settings

Sentence format: $PUWV1,x,x,x.x,x,x,x.x*hh<CR><LF>

Field/Parameter Description
$ Sentence start ‘$’
PUWV UWV
1 Sentence ID
txChID Tx code channel ID
rxChID Rx code channel ID
STY Salinity, PSU
isCmdMode ‘0’ - command mode by pin, ‘1’ - command mode by default (to switch back to transparent channel mode use ‘0’)
isACKOnTXFinished ‘1’ - Device will send IC_D2H_ACK with LOC_ACK_TX_FINISHED ACK code after TX buffer has been emptied, ‘0’ - no ACK on TX buffer empty
gravityAcc gravity acceleration value for precise depth estimate, in m/s2 from range 9.77 to 9.84
* Checksum separator NMEA
hh Checksum NMEA
<CR><LF> Sentence end

2.3. IC_H2D_RC_REQUEST

Code request to a remote subscriber

Sentence format: $PUWV2,x,x,x*hh <CR><LF>

Field/Parameter Description
$ Sentence start ‘$’
PUWV UWV
2 Sentence ID
txChID Tx code channel ID
rxChID Rx code channel ID for the request
rcCmdID Command ID (see 4.2)
* Checksum separator NMEA
hh Checksum NMEA
<CR><LF> Sentence end

2.4. IC_D2H_RC_RESPONSE

Answer of remote subscriber

Sentence format: $PUWV3,x,x.x,x.x,x.x,x.x,x.x*hh <CR><LF>

Field/Parameter Description
$ Sentence start ‘$’
PUWV UWV
3 Sentence ID
rcCmdID Command ID (see 4.2)
propTime Signal propagation time, sec
MSR Mean main lobe to side-peak ratio, dB
Value Requested value
Azimuth Horizontal angle of arrival. Only for uWAVE USBL devices, otherwise the field is empty
* Checksum separator NMEA
hh Checksum NMEA
<CR><LF> Sentence end

2.5. IC_D2H_RC_TIMEOUT

Remote subscriber timeout

Sentence format: $PUWV4,x*hh <CR><LF>

Field/Parameter Description
$ Sentence start ‘$’
PUWV UWV
4 Sentence ID
rcCmdID Command ID (see 4.2)
* Checksum separator NMEA
hh Checksum NMEA
<CR><LF> Sentence end

2.6. IC_D2H_RC_ASYNC_IN

Incoming message from a remote subscriber

Sentence format: $PUWV5,x,x.x,x*hh <CR><LF>

Field/Parameter Description
$ Sentence start ‘$’
PUWV UWV
5 Sentence ID
rcCmdID Command ID (see 4.2)
MSR Mean main lobe to side-peak ratio, dB
Azimuth Horizontal angle of arrival. Only for uWAVE USBL devices, otherwise the field is empty
* Checksum separator NMEA
hh Checksum NMEA
<CR><LF> Sentence end

2.7. IC_H2D_AMB_DTA_CFG

Ambient parameters and supply voltage configuration.
This mesage configures the modem’s output of the readings of the built-in pressure/temperature sensor and supply voltage. After configuration, the modem can transmit these readings using the IC_D2H_AMB_DTA message.

Sentence format: $PUWV6,x,x,x,x,x,x*hh <CR><LF>

Field/Parameter Description
$ Sentence start ‘$’
PUWV UWV
6 Sentence identifier
IsSaveToFlash 1 - store settings in internal Flash, 0 - do not store
PeriodMs IC_D2H_AMB_DTA period in msec., 0 - disabled, 1 - tandem (send immediately after any outcoming message to the host system), or value from 500 to 60000 (0.5 - 60 sec.)
IsPressure 1 - pressure output enabled, 0 - disabled
IsTemperature 1 - temperature output enabled, 0 - disabled
IsDepth 1 - depth output enabled, 0 - disabled
IsVCC 1 - supply voltage output enabled, 0 - disabled
* Checksum separator NMEA
hh Checksum NMEA
<CR><LF> Sentence end

2.8. IC_H2D_AMB_DTA

Ambient parameters and supply voltage.

Sentence format: $PUWV7,x.x,x.x,x.x,x.x*hh <CR><LF>

Field/Parameter Description
$ Sentence start ‘$’
PUWV UWV
7 Sentence identifier
Pressure_mBar Pressure in mBar
Temperature_C Temperature in °C
Depth_m Depth in meters
VCC_V Supply voltage in Volts
* Checksum separator NMEA
hh Checksum NMEA
<CR><LF> Sentence end

2.9. IC_H2D_DINFO_GET

Request device information

Sentence format: $PUWV?,x*hh <CR><LF>

Field/Parameter Description
$ Sentence start ‘$’
PUWV UWV
? Sentence ID
Reserved Reserved
* Checksum separator NMEA
hh Checksum NMEA
<CR><LF> Sentence end

2.10. IC_D2H_DINFO

Device information

Sentence format: $PUWV!,c--c,с--с,x,c--c,x,x.x,x,x,x*hh <CR><LF>

Field/Parameter Description
$ Sentence start ‘$’
PUWV UWV
! Sentence ID
Serial number Device serial number
System moniker System name
System version System version
Core moniker Communication subsystem
Core version Communication subsystem version
acBaudrate Data transmission speed, baud
rxChID Rx code channel ID
txChID Tx code channel ID
maxChannels Total number of possible code channel IDs
styPSU Water salinity, PSU (can be set by the user)
isPTS ‘1’ - device has a pressure/temperature sensor, ‘0’ - otherwise
isCmdMode ‘1’ - command mode by default, ‘0’ - command mode by command pin.
* Checksum separator NMEA
hh Checksum NMEA
<CR><LF> Sentence end

2.11. IC_H2D_PT_SETTINGS_READ

Read packet mode settings. The device responds to this request with the sentence IC_D2H_PT_SETTINGS.

Sentence format: $PUWVD,x*hh <CR><LF>

Field/Parameter Description
$ Sentence start ‘$’
PUWV UWV
D Sentence identifier
reserved Should be ‘0’
* Checksum separator NMEA
hh Checksum NMEA
<CR><LF> Sentence end

2.12. IC_D2H_PT_SETTINGS

Packet mode settings.

Sentence format: $PUWVE,x,x*hh <CR><LF>

Field/Parameter Description
$ Sentence start ‘$’
PUWV UWV
E Sentence identifier
isPTMode ‘0’ - packet mode disabled, ‘1’ - packet mode enabled. Not used since firmware version 1.20 - for transmission in packet mode, the modem needs only to be in command mode, and receiving a packet message is possible regardless of the mode in which the modem is
ptLocalAddress Address of the local modem in the packet mode, 0 .. 254
* Checksum separator NMEA
hh Checksum NMEA
<CR><LF> Sentence end

2.13. IC_H2D_PT_SETTINGS_WRITE

Set new settings for the packet mode. The device responds to this request with the sentence IC_D2H_PT_SETTINGS.

Sentence format: $PUWVF,x,x,x*hh <CR><LF>

Field/Parameter Description
$ Sentence start ‘$’
PUWV UWV
F Sentence identifier
isSaveInFlash ‘0’ - do not save settings to flash, ‘1’ - save settings to flash
isPTMode ‘0’ - packet mode disabled, ‘1’ - packet mode enabled. Not used since firmware version 1.20 - for transmission in packet mode, the modem needs only to be in command mode, and receiving a packet message is possible regardless of the mode in which the modem is
ptLocalAddress Address of the local modem in the packet mode, 0 .. 254
* Checksum separator NMEA
hh Checksum NMEA
<CR><LF> Sentence end

2.14. IC_H2D_PT_SEND

Send message in packet mode.

Sentence format: $PUWVG,x,x,h--h*hh <CR><LF>

Field/Parameter Description
$ Sentence start ‘$’
PUWV UWV
G Sentence identifier
target_ptAddress Address of a remote modem, 0 .. 254, 255 - broadcast
maxTries Maximum number of attempts, 0 .. 255. If the field is empty, the default maximum number of attempts will be used - 255
dataPacket An array of bytes in HEX format with a ‘0x’ prefix, for example, for the string ‘123’ 0x313233. The maximum packet size is 64 bytes. If the field is empty, the current transfer will be canceled.
* Checksum separator NMEA
hh Checksum NMEA
<CR><LF> Sentence end

2.15. IC_D2H_PT_FAILED

Data packet transmission was unsuccessful.

Sentence format: $PUWVH,x,x,h--h*hh <CR><LF>

Field/Parameter Description
$ Sentence start ‘$’
PUWV UWV
H Sentence identifier
target_ptAddress Address of a remote modem, 0 .. 254
maxTries Number of attempts proceeded
dataPacket An array of bytes in HEX format with a ‘0x’ prefix, for example, for the string ‘123’ 0x313233. The maximum packet size is 64 bytes.
* Checksum separator NMEA
hh Checksum NMEA
<CR><LF> Sentence end

2.16. IC_D2H_PT_DLVRD

The data packet has been successfully transmitted.

Sentence format: $PUWVI,x,x,x.x,h--h*hh <CR><LF>

Field/Parameter Description
$ Sentence start ‘$’
PUWV UWV
I Sentence identifier
target_ptAddress Address of a remote modem, 0 .. 254
maxTries Number of attempts proceeded
azimuth Horizontal angle of arrival. Only for uWAVE USBL devices, otherwise the field is empty
dataPacket An array of bytes in HEX format with a ‘0x’ prefix, for example, for the string ‘123’ 0x313233. The maximum packet size is 64 bytes.
* Checksum separator NMEA
hh Checksum NMEA
<CR><LF> Sentence end

2.17. IC_D2H_PT_RCVD

Data packet received.

Sentence format: $PUWVJ,x,x.x,h--h*hh <CR><LF>

Field/Parameter Description
$ Sentence start ‘$’
PUWV UWV
J Sentence identifier
sender_ptAddress Address of a sender, 0 .. 254
azimuth Horizontal angle of arrival. Only for uWAVE USBL devices, otherwise the field is empty
dataPacket An array of bytes in HEX format with a ‘0x’ prefix, for example, for the string ‘123’ 0x313233. The maximum packet size is 64 bytes.
* Checksum separator NMEA
hh Checksum NMEA
<CR><LF> Sentence end

2.18. IC_H2D_PT_ITG

Remote request with logical addressing.

Sentence format: $PUWVK,x,x*hh <CR><LF>

Field/Parameter Description
$ Sentence start ‘$’
PUWV UWV
K Sentence identifier
target_ptAddress Address of a remote modem, 0 .. 254
dataID Paramter ID (0 - depth, 1 - temperature, 2 - supply voltage)
* Checksum separator NMEA
hh Checksum NMEA
<CR><LF> Sentence end

2.19. IC_D2H_PT_ITG_TMO

Remote device timeout with logical addressing.

Sentence format: $PUWVL,x,x*hh <CR><LF>

Field/Parameter Description
$ Sentence start ‘$’
PUWV UWV
K Sentence identifier
target_ptAddress Address of a remote modem, 0 .. 254
dataID Requested paramter ID (0 - depth, 1 - temperature, 2 - supply voltage)
* Checksum separator NMEA
hh Checksum NMEA
<CR><LF> Sentence end

2.20. IC_D2H_PT_ITG_RESP

Remote response with logical addressing.

Sentence format: $PUWVM,x,x,x.x,x.x,x.x*hh <CR><LF>

Field/Parameter Description
$ Sentence start ‘$’
PUWV UWV
K Sentence identifier
target_ptAddress Address of a remote modem, 0 .. 254
dataID Requested paramter ID (0 - depth, 1 - temperature, 2 - supply voltage)
dataValue Requested paramter value
pTime Measured propagation time, sec
azimuth Horizontal angle of arrival, °. Only for uWAVE USBL devices, otherwise the field is empty
* Checksum separator NMEA
hh Checksum NMEA
<CR><LF> Sentence end

2.21. IC_H2D_INC_DTA_CFG

For uWAVE USBL devices only. Настройка вывода данных о крене и дифференте.

Sentence format: $PUWV8,x,x*hh<CR><LF>

Field/Parameter Description
$ Sentence start ‘$’
PUWV UWV
8 Sentence identifier
IsSaveToFlash 1 - store settings in internal Flash, 0 - do not store
PeriodMs Period in msec., 0 - disabled, 1 - tandem (send immediately after any outcoming message to the host system), or value from 500 to 60000 (0.5 - 60 sec.)
* Checksum separator NMEA
hh Checksum NMEA
<CR><LF> Sentence end

2.22. IC_D2H_INC_DTA

For uWAVE USBL devices only. Pitch and roll readings.

Sentence format: $PUWV9,x.x,x.x,x.x*hh<CR><LF>

Field/Parameter Description
$ Sentence start ‘$’
PUWV UWV
9 Sentence identifier
reserved Reserved and left empty
Pitch Device’s pitch in degrees
Roll Device’s roll in degrees
* Checksum separator NMEA
hh Checksum NMEA
<CR><LF> Sentence end

3. Working modes

3.1. Transparent channel mode

In the transparent channel mode, the devices do not analyze the data coming from the control system and transmit them without changes to the hydroacoustic channel, where they can be received by any other uWave modem receiving in the same code channel in which the transmission was made. Provided that the receiving modem has not activated packet mode.

3.2. Command mode

uWave modems provide the user with a so-called “transparent channel” when all data supplied to the input without changes and analysis are transmitted to the hydroacoustic channel, after which they are received by another modem and in the unchanged form are given to the user at the receiving side. In this regard, to be able to configure modems, as well as to measure the propagation time to remote subscribers, there is a command mode. Modems analyze input data only in command mode. To switch to the command mode, the “service” core should be pulled to +3.3 V. After that, the “service” core should be pulled to the ground to exit the service mode. Also, the command mode can be enabled by default using the IC_H2D_SETTINGS_WRITE sentence, when isCmdMode parameter equals to 1. To return to control by “service” core, IC_H2D_SETTINGS_WRITE sentence can be used with isCmdMode parameter equals to 0.

WARNING! The core “service” is pulled ONLY to 3-5 V or ground, connecting it to a higher voltage will cause a FATAL and NON-GUARANTEE failure of the device.

WARNING! Before switching on the device, the “service” core should be pulled to the ground, otherwise, the device will enter the software update mode.

3.3. Packet mode

Packet mode provides the user with the ability to transfer data in packets up to 64 bytes with guaranteed delivery (ALO - at-least-once, it is guaranteed that the message will be transmitted at least once) and receipt notification (acknowledgement). Since the interaction of the modem with the user system in the packet mode is implemented using NMEA0183 sentences, to work in this mode, both the transmitting and receiving devices must be switched to command mode. In packet mode, up to 255 devices are addressed (addresses from 0 to 254, address 255 reserved for broadcast messages without acknowledgements). The following functions are available to the user:

To interact with the modem in batch mode, use the commands from 2.11. IC_H2D_PT_SETTINGS_READ according to 2.20. IC_D2H_PT_ITG_RESP.

After transmitting data in packet mode, the sending modem waits for a short code message ACK from the sender, upon receipt it notifies the user of a successful transmission or repeats the transmission until a response is received from the sender or the number of attempts is exceeded.

4. Identifiers

4.1. Error codes

Error Value Description
LOC_ERR_NO_ERROR 0 Request accepted
LOC_ERR_INVALID_SYNTAX 1 Syntax error
LOC_ERR_UNSUPPORTED 2 Request not supported
LOC_ERR_TRANSMITTER_BUSY 3 Transmitter is busy
LOC_ERR_ARGUMENT_OUT_OF_RANGE 4 Specified parameter out of range
LOC_ERR_INVALID_OPERATION 5 Invalid request
LOC_ERR_UNKNOWN_FIELD_ID 6 Unknown field identifier
LOC_ERR_VALUE_UNAVAILIBLE 7 Requested parameter is not available at the moment
LOC_ERR_RECEIVER_BUSY 8 Receiver is busy (waiting for a remote answer)
LOC_ERR_TX_BUFFER_OVERRUN 9 Transmitter buffer is full
LOC_ERR_CHKSUM_ERROR 10 Checksum error
LOC_ACK_TX_FINISHED 11 Transmission finished, buffer is empty
LOC_ACK_BEFORE_STANDBY 12 Device is entering stand-by mode
LOC_ACK_AFTER_WAKEUP 13 Device is exited stand-by mode
LOC_ERR_SVOLTAGE_TOO_HIGH 14 Supply voltage too high, power amplifier will not be used

4.2 Remote commands

Command Value Description
RC_PING 0 Ping
RC_PONG 1 Pong
RC_DPT_GET 2 Request a depth value of a remote subscriber
RC_TMP_GET 3 Request a temp. Value of a remote subscriber
RC_BAT_V_GET 4 Request a battery voltage of a remote subscriber
RC_ERR_NSUP 5 Remote subscriber answered - request not supported
RC_ACK 6 Remote subscriber answered - request accepted
RC_USR_CMD_000 7 User command
RC_USR_CMD_001 8 User command
RC_USR_CMD_002 9 User command
RC_USR_CMD_003 10 User command
RC_USR_CMD_004 11 User command
RC_USR_CMD_005 12 User command
RC_USR_CMD_006 13 User command
RC_USR_CMD_007 14 User command
RC_USR_CMD_008 15 User command
RC_MSG_ASYNC_IN 16 Incoming message in the transparent channel mode

5. Appendix

5.1. Command mode interfacing examples

In the following examples, the messages that come to a modem are prefixed with <<, and the messages that come from the modem are prefixed with >>.
It is assumed that the modem is connected to a host system, and the command mode is enabled.

5.1.2. Example 1 - requesting device information

<< $PUWV?,0*27<CR><LF>

PUWV? = IC_H2D_DINFO_GET

>> $PUWV!,3A001E000E51363437333330,STRONG,256,uWAVE [JULY],257,78.27,0,0,28,0.0,1,0*18<CR><LF>

PUWV! = IC_D2H_DINFO
3A001E000E51363437333330 = serial number,
STRONG = system moniker
256 = 0x0100 system version is 01.00
uWAVE [JULY] = core moniker,
257 = 0x0101 core version is 01.01
78.27 = acoustic channel baudrate, bit/sec
0 = Tx channel ID
0 = Rx channel ID
28 = total number of channels available
0.0 = salinity, PSU
1 = built-in pressure/temperature sensor is present
0 = command mode by default is disabled

5.1.3. Example 2 - requesting remote data from a remote subscriber

<< $PUWV2,0,0,2*28

PUWV2 = IC_H2D_RC_REQUEST
0 = Tx channel ID (target Rx channel ID)
0 = Rx channel ID (target Tx channel ID)
2 = Request ID = RC_DPT_GET

>> $PUWV0,2,0*36

PUWV0 = IC_D2H_ACK
2 = ACK is for PUWV2 request
0 = Error code = LOC_ERR_NO_ERROR

>> $PUWV3,0,2,0.00020,22.75,0.000,*1B

PUWV3 = IC_D2H_RC_RESPONSE
0 = remote modem’s Rx channel ID
2 = Request ID = RC_DPT_GET
0.00020 = Propagation time, sec
22.75 = MSR (Main lobe to side-peak ratio), dB
0.000 = received value (in this case remote modem’s depth in meters)

<< $PUWV2,0,0,3*29

PUWV2 = IC_H2D_RC_REQUEST
0 = Tx channel ID (target Rx channel ID)
0 = Rx channel ID (target Tx channel ID)
3 = Request ID = RC_TMP_GET

>> $PUWV0,2,0*36

PUWV0 = IC_D2H_ACK
2 = ACK is for PUWV2 request
0 = Error code = LOC_ERR_NO_ERROR

>> $PUWV3,0,3,0.00030,26.31,27.300,*29

PUWV3 = IC_D2H_RC_RESPONSE
0 = remote modem’s Rx channel ID
2 = Request ID = RC_TMP_GET
0.00030 = Propagation time, sec
26.31 = MSR (Main lobe to side-peak ratio), dB
27.300 = received value (in this case remote modem’s temperature in °C)

5.1.4. Example 3 - setting up the ambient data configuration

<< $PUWV6,0,1000,1,1,1,1*03<CR><LF>

PUWV6 = IC_H2D_AMB_DTA_CFG
0 = isSaveToFlash = false
1000 = transmit ambient data every 1000 msec
1 = isPressure = true
1 = isTemperature = true
1 = isDepth = true
1 = isVCC = true

>> $PUWV0,6,0*32<CR><LF>

PUWV0 = IC_D2H_ACK
6 = ACK is for PUWV6 request
0 = Error code = LOC_ERR_NO_ERROR

>> $PUWV7,1025.2,29.9,-0.014,5.0*18
. . .
>> $PUWV7,1026.3,29.9,-0.002,5.0*1D

PUWV7 = IC_D2H_AMB_DTA
1026.3 = current pressure, mBar
29.9 = current temperature, °C
-0.002 = current depth, m
5.0 = current supply voltage, V

<< $PUWV6,0,0,0,0,0,0*32

PUWV6 = IC_H2D_AMB_DTA_CFG
0 = isSaveToFlash = false
0 = do not transmit ambient data
0 = isPressure = false
0 = isTemperature = false
0 = isDepth = false
0 = isVCC = false

>> $PUWV0,6,0*32

PUWV0 = IC_D2H_ACK
6 = ACK is for PUWV6 request
0 = Error code = LOC_ERR_NO_ERROR

5.1.5. Example 4 - Enabling packet mode

<< $PUWVF,1,1,0*5E<CR><LF>

PUWVF = IC_H2D_PT_SETTINGS_WRITE
1 = Save settings to flash
1 = Packet mode enabled
0 = Address of the local modem

>> $PUWVE,1,0*40

PUWVE = IC_D2H_PT_SETTINGS
1 = Packet mode enabled
0 = Address of the local modem

5.1.6. Example 5 - Sending a message in the packet mode and receiving an acknowledgement

<< $PUWVG,0,8,0x313233*2C

PUWVG = IC_H2D_PT_SEND
0 = Target address
8 = Max number of attempts
0x313233 = bytes to send (‘123’)

>> $PUWV0,G,0*43

PUWV0 = IC_D2H_ACK
G = ACK for PUWVG
0 = Error code = LOC_ERR_NO_ERROR

$PUWVI,0,1,,0x313233*07

PUWVI = IC_D2H_PT_DLVRD
0 = Target address
1 = Attempts preceeded
empty field - the device doesn’t support horizontal angle of arrival estimation
0x313233 = bytes to send (‘123’)

5.2. Recipes

It is assumed that the modem is connected to a host system, and the command mode is enabled. Sentences can be copied and sent to the modem. Characters (New line, Hex: 0x0D 0x0A, Dec: 13 10, или \\r\\n) should be added.

Recipe 1

Set default settings

$PUWV1,0,0,0.,0,0,9.8067*35

Recipe 2

Disabling automatic transmission of all parameters of the environment and supply voltage and saving the settings in the flash.

$PUWV6,0,0,0,0,0,0*32

Recipe 3

Enabling automatic transmission of all parameters of the environment and supply voltage 1 time per second without saving these settings to the flash.

$PUWV6,0,1000,1,1,1,1*03

Recipe 4

Enabling automatic transmission of all parameters of the environment and supply voltage after any outgoing message from the modem without saving the settings to the flash.

$PUWV6,0,1,1,1,1,1*33

Recipe 5

Enabling automatic transmission of only the depth of the local modem after any outgoing message from the modem without saving the settings to the flash.

$PUWV6,0,1,0,0,1,0*32

Recipe 6

Requesting the depth of the remote modem with transmit and receive channel IDs of 0.

$PUWV2,0,0,2*28

Back to content