BiRa Systems |
TYPE L-2 SERIAL CRATE CONTROLLER
Bi Ra Model 1502 Type L-2 Serial Crate Controller complies fully with the CAMAC specifications. This double-width module is the CAMAC standard interface between the CAMAC Serial Highway and the crate dataway. This Model 1502 will operate with any standard serial driver (such as the Model 1401) and allows operation with up to 62 crates in a loop arrangement. The units may be directly cabled or linked with adapter modules and modems. The units can be operated in the Bit or Byte serial modes. The Bit serial mode allows for economical cabling between units, where as the Byte mode is ten times faster in operation. The units will operate up to 5MHz clock rates; the transmission medium may limit the maximum clock rate. The use of fiber optic adapters allow operation over longer distances and higher speeds than direct cabling between units.
Model 1502 will generate demand messages in response to any LAM in the crate. The three Byte message is inserted between other messages on the serial highway. The unit will generate Repeat-Demand messages if the LAM is not cleared in a specified elapsed time. Delays from msec to ten seconds are switch selectable on the module. The repeat can be disabled with a strap on the module. The SGL connector is mounted on the rear of the module above the dataway and is the standard 2DB52P connector. The connector has all the signals necessary to operate the unit with the standard auxiliary controllers and to initiate demand messages.
| NORMAL | OFFLINE | BYPASS | |||||
|---|---|---|---|---|---|---|---|
| COMMANDS | SQ | SX | SQ | SX | SQ | SX | |
| Read Status Register | N30 F1 A0 RD2 | 1 | 1 | 1 | 1 | 1 | 0 |
| Write Status Register | N30 F17 A0 WT2 | 1 | 1 | 1 | 1 | 1 | 0* |
| Selective Set Status Register | N30 F19 A0 SS2 | 1 | 1 | 1 | 1 | 1 | 0 |
| Selective Clear Status Register | N30 F23 A0 SC1 | 1 | 1 | 1 | 1 | 1 | 0* |
| Reread Data Field | N30 F0 A1 RD1 | DSQ | 1 | DSQ | 1 | 1 | 0 |
| Read LAM Pattern | N30 F1 A12 RD2 | 1 | 1 | 0 | 0 | 1 | 0 |
| Dataway Command | Q | X | 0 | 0 | 1 | 0 | |
| Error Reply | *X=1 for command to clear BYPASS | 0 | 0 | 0 | 0 | 0 | 0 |
| Bit | Write Logic 1 into Register | Read Logic 1 from Register | State on Power-Up |
|---|---|---|---|
| 1 | Generate Z | always 0 | 0 |
| 2 | Generate C | always 0 | 0 |
| 3 | Set I=1 | Iout=1 | 1 |
| 4 | - | DERR=1 | 0 |
| 5 | - | DSX=1 | 0 |
| 6 | - | DSQ=1 | 0 |
| 7 | - | Dataway I=1 | 0 |
| 8 | Reserved | always 0 | - |
| 9 | Enable Demands | Demand Enable | 0 |
| 10 | Set Internal Demand L24 | L24=1 | 0 |
| 11 | Collapse Loop | Loop Collapsed | 0 |
| 12 | Apply Bypass | always 0 | 1 |
| 13 | Dataway Offline | Dataway Offline | 1 |
| 14 | - | Switch Offline | - |
| 15 | Reserved | always 0 | - |
| 16 | - | Selected LAM present | - |
Bits 11 and 12 of the status register control magnetically shielded relays in the SCC. The contacts of these relays control external Loop Collapse and Bypass hardware, via contacts in the D-ports connectors. The state of power-up or when crate power is removal are the same, the loop is not collapsed, and BYPASS has been applied.
The front panel serial highway connectors have contacts that allow control of external By-Pass and Loop Collapse devices. If power is lost in the crate, the By-Pass contact will close the Loop Collapse contact will open. The connectors have the standard configuration that allows connecting one serial cable to the OUT connector and installing a jumper connector in the IN connector. The optional auxiliary connector allows front panel access to clocks, Bit data signals, and module voltages.
| +6 Volts | 2200 mA |
|---|
1.2kg. (2 lbs. 9 0z.)
Model 1502 Type L-2 Serial Crate Controller
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Bi Ra Systems,
Incorporated
2404 Comanche Road NE
Albuquerque, New Mexico 87107
Ph : 505-881-8887
Fax:505-888-0651