VMIC VMI4116 16-Bit DAC

Authors: Bob Dalesio, Mike Bordua (1994)

Configuration
Supported Record Types
Usage Notes
Debug Variable
Hardware Reference

The VMIVME-4116 is an 8-channel, 16-bit digital-to-analog converter (DAC) VME module in A16 short I/O address space. This device support provides EPICS ao record access to all 8 output channels.

Configuration

Call VMI4116_setup in the IOC startup script before iocInit:

VMI4116_setup(num_cards, addrs)

Argument	Description	Default
`num_cards`	Maximum number of cards in crate	1
`addrs`	A16 base address (must be on 32-byte boundary, range `0x0000`-`0xffe0`)	`0xff00`

Example:

VMI4116_setup(1, 0xff00)
dbLoadRecords("$(VME)/vmeApp/Db/VME_DAC.db", "P=$(PREFIX),D=1,N=chan1,DTYP=VMIVME-4116,C=0,S=0,H=10,L=-10")

The VME_DAC.db template provides a rate-of-change-limited DAC output with tweaking and can be used with this device support by setting DTYP="VMIVME-4116".

Supported Record Types

Record Type	DTYP String
ao	`"VMIVME-4116"`

Link type: VME_IO (#C<card> S<signal> @)

Where signal is the channel number (0-7).

Usage Notes

8 channels of 16-bit DAC output plus a control/status register (CSR), all in A16 address space.
Linear conversion slope: (EGUF - EGUL) / 65535.0
The card cannot be read back from hardware.
Card detection at init is verified by probing the CSR register.

Debug Variable

var devAoVMI4116Debug 0

Non-zero enables card-detection messages during initialization.

Hardware Reference

See VMICVMI4116.pdf for the VMIC VMI4116 datasheet.