# MEM Series Relay

All MetraBus boards require a cable and an interface board (such as an ISA-, PC104-, or PCI- MDB64) to interface to the host computer system.

The MEM Series Relay boards include the following hardware:

- MEM-32
- MEM-8

The MEM Series Relay boards supports the following UL and UL for .NET features.

## Digital I/O

Functions

UL: cbDIn(), cbDBitIn(), cbDOut(), cbDBitOut()

UL for .NET: DIn(), DBitIn(), DOut(), DBitOut()

PortNum

FIRSTPORTA

For MEM-32, the following argument values are also valid:

- FIRSTPORTB
- SECONDPORTA, SECONDPORTB

DataValue

0 to 255 for PORTA or PORTB

BitNum

0 to 7 for FIRSTPORTA

For MEM-32, the following argument values are also valid:

- 0 to 31 for FIRSTPORTA

## Hardware Considerations

##### Reading back the output state of a MEM Series relay

Although the MEM Series Relay is a digital output-only board, the state of the outputs can be read back using the UL functions cbDIn() and cbDBitIn(), or the UL for .NET methods DIn() and DBitIn().