SSC-ASD2 Mini SSC Serial Servo Controller
Use an RS-232-type serial connection to control standard radio-control (R/C) servos for robotics, automation, and animatronics. The Mini SSC 2 accepts serial input at 2400 or 9600 bps and outputs eight rock-steady servo-control signals.
Mini SSCs can be controlled by any computer with serial-output capability, such as "Stamp" type controllers or PCs with a "com" (not USB) port. The user manual includes program examples for Stamps and PCs.
NOTE: This product is not recommended for new applications. It has been discontinued, and when remaining stock is sold out, the SSC will no longer be available.
SSC-ASD2 Features
- Controls up to eight R/C servos per SSC
- 2400 or 9600bps serial input
- Simple three-byte instruction format
- Configurable for position range/resolution of 90°/0.36° or 180°/0.72°
- Daisy chainable; connect two SSCs together for 16-servo control
Basic Specifications
| Size | 1.4 x 2.1 in. (36 x 54mm) |
|---|---|
| Power Input (SSC) | 7.0 to 15Vdc at < 10mA |
| Power Input (Servos) | See servos specs; 4.8Vdc at 500mA/servo typical |
| User Connector | 2-pin header, 0.025in. posts on 0.10in. centers |
| Connector Pinout | Gnd Serial |
| Serial Cable Connector | Modular 'phone' style jack |
| Serial Input | RS-232 (negative swing OK) or inverted TTL |
| Servo Connector | 3-pin header, 0.025in. posts on 0.10in. centers |
| Servo Pinout | PWM +V GND (usually white-red-black) |
| Pulse Output (normal) | 1.5ms (center/starup) ± 0.5ms |
| Pulse Output (wide) | 1.5ms (center/starup) ± 1.0ms |
| Pulse Rep Rate | 50Hz/channel (normal); pulses non-overlapping |
| Operating Temp | 0° to 50° C |
SSC Instructions
The SSC has only one instruction: move servo x to position y. The SSC immediately updates that servo's output to the instructed pulse/position value. The SSC continues to send the last-instructed position/pulse output until instructed differently.
Instructions are sent as three bytes: a synch marker [always 255 (0xFF hex)], the servo number [0-254 (0x00-0xFE hex)] and the position value [0-254 (0x00-0xFE hex)]. Reserving 255 (0xFF) as a synch marker and disallowing it as a servo number or position value prevents problems in case the serial connection is interrupted.
| Synch | Servo Number | Position Value |
|---|---|---|
| 255 (0xFF hex) | 0-254 (0x00 - 0xFE) | 0-254 (0x00 - 0xFE) |
Accessories
- SSC-CBL serial cable for DE9 female-type serial ports (PC com port)
- Roboware PC software for servo control (3rd party vendor, not affiliated with Seetron)
- Visual Show Automation software and hardware for servo control (3rd party vendor, not affiliated with Seetron)