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.
- 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
|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|
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)|