VAST 4 Opto Isolated Relay Board (V4RLYOPTO)

General Description

The V4RLYOPTO has 4 relays with SPDT contacts capable of switching 3 Amps at 120 Volts AC, and 4 optically isolated inputs configured to detect contact closures.

Quick Start

1. Install ADDR jumpers to pins 1-2, 3-4, 5-6, 7-8 9-10 and 11-12 (as shipped). This puts the board at VAST address 0, with: The inputs at bit numbers 0 through 3. The relays at bit numbers 4 through 7.

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 cycle all 4 relays 
DO 
	FOR channel = 4 TO 7 
		VSET(channel) 
		delay(300) 
		VRESET(channel) 
		delay(300) 
	NEXT channel 
LOOP UNTIL 0 

Software Control

• VDIO_CONFIG() configures digital input and output.
• VSET() will energize a relay.
• VRESET() will de-energize a relay.
• VOUT() will write the specified byte to the specified port.
• VTEST() will return the state of an individual input bit.
• VINP() will return an 8 bit byte from the specified port.

See the Vesta Multi-Tasking Basic manual for information on how these commands are used. See "V4RLYOPTO Address Jumpers", below for information on which port numbers correspond to which outputs.

V4RLYOPTO Address Jumpers

Relay/Opto Connector

N.O.= Normally Open

Power Requirements

With all relays and opto inputs energized, the V4RLYOPTO requires approximately 1 Ampere of current at 5 VDC.

The +R jumper must be removed if an external power supply is used.

Power Source

Power may be supplied over the VAST cable. Typical cable loss is 150 mV per foot of VAST cable when the V4RLYOPTO is fully energized.

Power may be applied directly to the V4RLYOPTO at the PWR connector. If a separate power supply is used for the V4RLYOPTO or if the coil voltage of the V4RLYOPTO is not 5 VDC, the jumper "+R" must be removed.

V4RLYOPTO Dimension Drawing

Dimensions are in inches.

V4RLYOPTO Schematic