This product is obsolete/discontinued and no further stocks are available. Please see alternatives in the category links above.
The SC21 is supplied with all 8 relay positions populated. It can be used with either SX-I or SX-II single board computers or other hardware of your choice. It allows you to control external devices such as lights, motors and solenoids from your program. If you use the optional DS1216B Smart Watch on the motherboard, then programs in real time can be written.
The latch IC (74HC273) can be addressed by any one of four I/O ports (80h,81h,82h,83h) that are available at the I/O expansion connector CN1. The jumper on LK1 or LK2 selects the port to use. Each port is connected to the Data Bus and consists of eight bits. When a particular bit output goes high the transistor it is connected to is turned fully on which in turn switches the relay on. A total of 4 Relay Driver boards (or 32 individual relays) can be connected to CN1 simultaneously (one board connected to each of the 4 available ports.)
All components to build the board and populate all eight relay positions are supplied along with 240mm long IDC connection cable.Specifications
|Current Consumption||300mA max (40mA standby plus ~30mA per active relay)|
|Outputs||8 x SPDT Relays|
|Up to 48Vac or 28Vdc @ 2 Amps max. per relay (Relay Datasheet)|
|Output Connections||NO, NC, C (Relay FAQ)|
|Computer Interface||16-pin IDC|
|Dimensions||207mm x 67mm x 25mm (8.1" x 2.6" x 1")|
|Connections||Power: 2-pole screw terminal block|
Relays: Screw terminal blocks
Computer: 16-pin IDC
|Product Format||SELF-ASSEMBLY Electronic Kit (KT) or|
PRE-ASSEMBLED Electronic Module (AS) Product Formats Info