This single-width module independently controls two magnet power supplies (per NAL standard No. SD-32 for analog referenced supplies). Two readable, writeable registers present 14 bits of input data to two multiplying D/A converters. Reference voltage for each D/A is independently software selectable from either an internal, fixed, 10.24V reference (For stand-alone DC mode operation) or from an external, fixed or variable voltage (such as provided by the CAMAC 150 Function Generator Module) for individual software-scaled, analog-mode operation.
Other provisions: four power supply digital control commands; also eight bits of status are monitored for each supply.
|F(0)A(0)||Read P.S. #1 Register|
|F(0)A(1)||Read P.S. #2 Register|
|F(1)A(0)||Read 8 status bits for P.S. #1|
|F(1)A(1)||Read 8 status bits for P.S. #2|
|F(6)A(0)||Read module number|
|F(9)A(0)||Clears Data registers|
Clears polarity commands
|F(12)A(0)||Reset P.S. #1|
|F(12)A(1)||Reset P.S. #2|
|F(16)A(0)||Load D/A input data into register #1|
|F(16)A(1)||Load D/A input data into register #2|
|F(17)A(0)||Load polarity data into bit 17 of register #1|
|F(17)A(1)||Load polarity data into bit 17 of register #2|
|F(24)A(0)||Connects D/A #1 to internal fixed voltage reference and clears its input register|
|F(24)A(1)||Connects D/A #2 to internal fixed voltage reference and clears its input register|
|F(26)A(0)||Connects D/A #1 to external voltage reference and clears its input register|
|F(26)A(1)||Connects D/A #2 to external voltage reference and clears its input register|
|F(28)A(0)||Sets P.S. #1 OFF|
|F(28)A(1)||Sets P.S. #2 OFF|
|F(30)A(0)||Sets P.S. #1 ON and clears its input register|
|F(30)A(1)||Sets P.S. #2 ON and clears its input register|
The analog output is a 0 to 10.239V signal
There are two modes of analog control: INTERNAL REFERENCE and EXTERNAL REFERENCE, individually selectable by software
For this mode the output is referenced to an internal 10.24V reference, and is a DC voltage. The command which selects this mode also resets the digital input register (hence the output voltage) to zero. The output voltage is then adjusted by writing the input register.
For this mode, the output is referenced to an external voltage source, either DC or varying analog (of 10.239V or less). The command which selects this mode for a power supply also resets the respective input register (hence the initial output voltage to zero.
Typically EXTERNAL mode is used to selectively slave the analog of one or both 151 module channels to some voltage-vs-time function generated by the CAMAC 150 module. Usually several 151 modules are daisy-chained to a 150 module OUT LEMO via 151 front panel EXTERNAL REFERENCE IN, OUT LEMOS. 151 output voltages are then individually adjusted to become finely scaled (14 bits) amplitude replicas of the 150 module output.
Eight (4 for each power supply) isolated relay contacts are used for ON, OFF, RESET, and POLARITY control functions. The ON and RESET signals are momentary relay closures of 100 milliseconds duration. The OFF signal is a momentary 100 millisecond contact opening. POLARITY is a sustained contact state (open or closed).
The module reads (monitors) up to 16 status points (8 for each power supply). Status must be presented at the 151 module VIKING I/O connector as (open or closed) floating relay contacts.
|Module Select (N) Light||Red LED||Flashes whenever module is addressed|
|EXTERNAL REFERENCE IN,OUT||2 PIN LEMO||Dual contact connectors for daisy-chaining to external voltage via shielded, twisted pair cable.|
|P.S. 1 REFERENCE Light||Red/Green LED||When light is green, P.S. #1 is in internal mode (for DC operation), Red light signifies P.S. #1 is slaved to an external reference.|
|P.S. 2 REFERENCE Light||Red/Green LED||Indicates the above for P.S. #2.|
This modules uses a 36 pin card edge connector. Signals on pins of viking connector are listed below. The left and right pins are wired respectively to left and right I/O cables. Each cable contains all connections for one power supply.
|1L||PS #2 Analog out (negative)||1R||P.S. #1 Analog out (negative)|
|2L||PS #2 Analog out (positive)||2R||P.S. #1 Analog out (positive)|
|3L||PS #2 ON||3R||P.S. #1 ON|
|4L||PS #2 ON||4R||P.S. #1 ON|
|5L||PS #2 OFF||5R||P.S. #1 OFF|
|6L||PS #2 OFF||6R||P.S. #1 OFF|
|7L||PS #2 RESET||7R||P.S. #1 RESET|
|8L||PS #2 RESET||8R||P.S. #1 RESET|
|9L||PS #2 POLARITY||9R||P.S. #1 POLARITY|
|10L||PS #2 POLARITY||10R||P.S. #1 POLARITY|
|11L||PS #2 Status bit 1||11R||P.S. #1 Status bit 1|
|12L||PS #2 Status bit 2||12R||P.S. #1 Status bit 2|
|13L||PS #2 Status bit 3||13R||P.S. #1 Status bit 3|
|14L||PS #2 Status bit 4||14R||P.S. #1 Status bit 4|
|15L||PS #2 Status bit 5||15R||P.S. #1 Status bit 5|
|16L||PS #2 Status bit 6||16R||P.S. #1 Status bit 6|
|17L||PS #2 Status bit 7||17R||P.S. #1 Status bit 7|
|18L||PS #2 Status bit 8||18R||P.S. #1 Status bit 8|
A ground connection is made using a ring terminal connected to one of the I/O screws.