CONTROLS HARDWARE RELEASE NO. 67.0
CAMAC 284 Module
Digital Input/Pulsed Output
Robert J. Ducar
August 9, 1989
2 CAMAC 284 OP CODES
8 PALS DOCUMENTATION
The one-wide CAMAC 284 module provides basic digital input and output control facilities. The module furnishes 16 bits of pulsed control and 16 bits of static monitor. The printed circuit board for this module provides a variety of input and output conventions that are easily modified for the end user. This module is nearly equivalent to the CAMAC 181 and 184 modules. It is distinguished by pulsed control bit outputs rather than static outputs.
The inputs may be configured as either active high or low. This is accomplished by certain chip substitutions and jumper relocations. The control bit output drivers are 74F3037 chips which have good source and sink capabilities. Selection of these chips also avoids the latch-up problem experienced with the 75446 drivers that is exhibited when these devices are powered off.
The monitor lines are TTL compatible and are normally active high with 1000 ohms to ground terminated inputs. Active low inputs and pulled-up inputs are available options to the user. An opto-coupled monitor input option is also available.
The pulsed outputs, nominally .75 second in duration, are also TTL compatible. These outputs are not terminated or pulled-up at the module. It is suggested that these lines be appropriately terminated at the external receiver. As is the case for the monitor lines, the pulsed control outputs may be configured as either active high or low. The module is normally provided with active low outputs. Upon clear command or powering-up, all control lines are set to the off state. Configuring the outputs as static rather than pulsed is also available as an option.
2 CAMAC 284 OP CODES
All codes return module Q and X immediately, except as noted. This module never asserts LAM.
F(0) A(0) Read Last Programmed Control Word --------- R16 (MSB) - (LSB) R1 --------------------------------- C15 - Control Word - C0
F(2) A(0) Read Monitor Word --------- R16 (MSB) - (LSB) R1 ------------------------------- M15 - Monitor Word - M0
F(6) A(0) Read Module Number --------- R16 - R10 | R9 - R1 ------------------------------ | 0 | 11C Hex, 284 Dec |
F(7) A(0) Dummy Read - No Data are Returned ---------
F(9) A(0) Reset Module --------- This command is a logical or with Z*S2 and power-up clear. It resets the pulsed control outputs to the off state.
F(16) A(0) Write Control Word (* Conditional Q) ---------- W16 (MSB) - (LSB) W1 --------------------------------- C15 - Control Word - C0
* Q is not returned if the outputs are still pulsing from a previous F(16) A(0) operation. Q is always returned if the outputs are con- figured as static rather than pulsed.
3 CAMAC 284 MODULE - I/O ASSIGNMENTS
Rear I/O: 36 Position Edge Connector A = R B = L
POS SIGNAL POS SIGNAL --- -------------- --- ---------------- 1L M15 (MSB) 1R M14 2L M13 2R M12 3L M11 3R M10 4L M9 4R M8 5L M7 5R M6 6L M5 6R M4 7L M3 7R M2 8L M1 8R M0 (LSB) 9L C15 (MSB) 9R C14 10L C13 10R C12 11L C11 11R C10 12L C9 12R C8 13L C7 13R C6 14L C5 14R C4 15L C3 15R C2 16L C1 16R C0 (LSB) 17L Opto Common M15-M8 17R Opto Common M7-M0 18L Common 18R Common
4 CAMAC 284 MODULE - FRONT PANEL
The CAMAC 284 module has the following front panel features:
N led: Red (stretched)
Output Active: Yellow led (not stretched)
A supply of CAMAC 284 operational spares is maintained on the second floor of the Linac Annex. Spares are normally provided with active high monitor inputs terminated with 1000 ohms to ground. Pulsed outputs are normally active low with pulse duration set to .75 second +/- 10%. Given the hardware options of the 284 module, replacement of an operational module requires careful attention to implemented options if present.
6 INPUT/OUTPUT OPTIONS
For active low inputs - substitute 74LS541 at IC Locations #29 and #30 and change 1K ohm pull-downs to 1K ohm pull-ups by means of jumper option.
For active high outputs - substitute 74LS541 at IC Locations #17 and #18 and change the pre-driver 470 ohm pull-downs to 470 ohm pull-ups by means of jumper option.
For static control outputs, ground patch points P1 and P2. The front panel "Output Active" led will also be on for this selected option.
For utilization of the opto-coupled inputs, refer to the schematic. The Opto Common connection at I/O 17L is common to coupler anodes of monitor lines M15 thru M8. The Opto Common connection at I/O 17R is common to coupler anodes of monitor lines M7 thru M0. Applied monitor voltages will determine the values of R1 and R2 associated with the couplers.
0812-ED-218532 Schematic 0812-BD-218533 Artwork (RF-133) 0812-BD-218534 Master Drawing 0812-MD-34863 Outline Drawing 0812-MC-218535 Front Panel Mechanical 0812-MD-218536 Front Panel Silkscreen
8 PALS DOCUMENTATION
Filenames: 28402A.DAT NAF Decoder PLS173