VAST 8 Zero Power Relay Board (V8ZPRLY)

General Description

The V8ZPRLY has 8 zero-power relays with latching SPDT for high power switching with minimal power consumption.

Quick Start

1. Install ADDR jumpers to pins 1-2, 3-4, 5-6, 7-8 and 9-10 (as shipped). This puts the board at VAST address 0, with:

• The relay set controls at bit numbers 0 through 7.
• The relay reset controls at bit numbers 8 through 15.

2. Connect the VAST cable to the SBC2000

3. Execute the following code:

SUBROUTINE delay(arg AS INTEGER) 
LOCAL index AS INTEGER 
	FOR index = 0 TO arg 
		REM 
	NEXT index 
END 
GLOBAL channel AS INTEGER 
CONSTANT crlf AS STRING = "\013\010" 
VDIO_CONFIG(0, 1)
REM set all 8 relays 
DO 
	FOR channel = 0 TO 7 
		VSET(channel): delay(300) 
		VRESET(channel)
	NEXT channel 
	REM reset all 8 relays 
	FOR channel = 0 TO 7 
		VSET(channel + 8): delay(300) 
		VRESET(channel + 8) 
	NEXT channel 
LOOP UNTIL 0

Software Control

• VDIO_CONFIG() configures digital output.
• VSET() will energize a relay.
• VRESET() will de-energize a relay.
• VOUT() will write the specified byte to the specified port.

See the Vesta Multi-Tasking Basic manual for information on how these commands are used. See "V8ZPRLY Address Jumpers" below, to see which port numbers are available at a specific VAST address.

Each of the zero-power relays on this board will retain its position (setting) in the absence of applied power. To set a relay, use VSET(relay#), wait at least 10 miliseconds, then execute VRESET(relay#). To reset the relay, use VSET(relay#+8), wait at least 10 miliseconds, then execute VRESET(relay# +8).

The reset pin becomes shorted to the COM (common) pin when the reset coil is energized. The set pin becomes shorted to the COM pin when the set coil is energized.

V8ZPRLY Address Jumpers

Relay Connector

The reset pin becomes shorted to the COM (common) pin when the reset coil is energized. The set pin becomes shorted to the COM pin when the set coil is energized. A coil must be must energized for no less than 10 ms. Power Source The relays are powered by the 5V supply on the SBC2000 board. Relay control coils require 80mA to energize each coil.

Power Requirements

The typical current draw for a V8ZPRLY is 1 mA for board logic, plus 80 mA for 10 ms when energizing a relay coil. Take care to only energize one or two coils at a time to avoid loading down the power supply. +R must be removed if an external power supply is used.

V8ZPRLY Dimension Drawing

Dimensions are in inches.

V8ZPRLY Schematic