Modem-M64🔗
The Modem-M64 is retired and no longer available for sale.
Description🔗
The Modem M64 is a two-way half-duplex 64bps acoustic modem with a robust and user configurable data link.
The M64 sets a new market standard with its record-breaking physical size, low power requirement and cost. All this combined with a very useful technical specification, the M64 opens new possibilities for underwater communication in both existing and new areas.
LED Signals🔗
-
No green light: Power is off.
-
Flashing green light (every 3 seconds): Modem is trying to pair with another modem.
-
Fixed green light: Modem has sync with another modem. The LED will blink each time it receives a packet from the other modem (once a second).
Wiring interface🔗
The tables below shows the pinning of the Modem-M64 interface. Depending on which cable type is used, the power wires may have different colors.
| Interface | Color (Belden) | Color (4TP1P) |
|---|---|---|
| Positive (10-18V) | Orange | Red |
| Negative/Ground | Orange/White | Black |
| UART RX | Brown | Brown |
| UART TX | Brown/White | Brown/White |
Note
Power must be applied to the power terminals before applying voltage to UART pins
Terminal Interface🔗
The Modem-M64 has a 3.3 volt UART interface.
| Settings | Value |
|---|---|
| Baud rate | 115200 |
| Data parity stop | 8N1 |
| Flow control | None |
Channels🔗
Modem M64 supports channels 1-7.
| From (kHz) | To (kHz) | Channels using this frequency band |
|---|---|---|
| 31.25 | 62.25 | 1 |
| 62.25 | 93.75 | 2 (16) |
| 93.75 | 125.00 | 3 (16) |
| 125.00 | 156.00 | 4 (17) |
| 156.00 | 187.00 | 5 (17) |
| 187.00 | 218.00 | 6 (18) |
| 218.00 | 250.00 | 7 (18) |
Please note that the Underwater GPS Explorer kit channels 16, 17, 18 overlaps and all channels overlaps with Underwater GPS G2.
Libraries and code examples🔗
Example code and libraries that can be used to communicate with the modem on the terminal interface:
Dimensions🔗
