DTMF Modems
PC Grabber Model 308
$185.95
The PCG308 is a compact, serial-driven telephony adapter for developers that connects any PC to an analog phone line with no external power required. Using simple text commands, your software can control on and off-hook, detect rings, and send or decode DTMF tones—making it the ideal for automated dialing, remote DTMF control, and emergency alerting systems.
Volume discounts available — request a quote for pricing on bulk orders.
How It Works
The PCG308 draws power directly from the serial port itself — no external power supply, wall adapter, or battery required. Connect it to any computer's serial port, wire it into a standard analog telephone line or PBX extension, and it's ready to go.
Control is entirely software-driven: your own code (or any serial terminal program) talks to the PCG308 over that same connection using simple text commands, turning ordinary telephony operations into function calls your application can trigger on demand.
- 1Line ControlTake the line on- or off-hook programmatically, exactly as if someone had picked up or hung up the handset.
- 2Ring DetectionDetect an incoming ring signal in real time, so your software knows the instant a call is coming in.
- 3DTMF TransmitSend DTMF tones out onto the line to dial numbers or navigate another system's phone menu automatically.
- 4DTMF DecodeRead back incoming DTMF keypresses in real time, turning a caller's touch-tone input into input your software can act on immediately.
Typical Applications
1
Emergency Out-of-Band Notification Systems
When a primary network or internet connection goes down, the PCG308 gives critical alerting software a way to reach people over the plain telephone network instead — placing calls and confirming delivery independently of whatever IP infrastructure might be the very thing that failed.
2
Interactive DTMF Remote-Control Gateways
Build phone-in control systems that let an authorized caller dial in, enter a DTMF code, and trigger an action on your equipment or software — from arming a security system to pulling a status report read back over the line.
3
Click-to-Dial CRM Integrations
Wire the PCG308 into a CRM or help desk platform so agents can place outbound calls with a single click, with your software driving the line directly instead of routing through a separate PBX or softphone.
4
Automated Wellness Checks
Schedule software to place a call at a set time, listen for an answer or a DTMF confirmation from a monitored individual, and automatically escalate to a caregiver or dispatcher if no response comes back.
Specifications
| Model | PCG308 |
|---|---|
| Function | Serial-Driven DTMF Modem & Line Interface |
| Interface | Serial port (bus-powered) |
| Power | Powered directly through the serial port — no external power supply or batteries required |
| Compatible Lines | Standard analog telephone line or PBX extension |
| Line Type | Analog only — not for use on digital telephone systems |
| Control Method | Simple text commands over the serial connection |
| Core Functions | On/off-hook control, ring detection, DTMF transmit, DTMF decode |
Documents
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