Module System Controller (MSC)
DIP Switch Settings
Behind the faceplate of the MSC is a bank of DIP switches that control various modes. Some of these settings can be overridden with PROM settings. The faceplate is removed by pressing a recessed tab from the top of faceplate, and rotating it downward. On a deskside system the front plastic skins panel will need to be removed first.
SW bits 1-0: Boot Diagnostics Testing Level
00: Normal diagnostics 01: No diagnostics (fast boot) 10: Heavy diagnostics 11: Manufacturing diagnostics
SW bit 2: Diagnostic Output Level
0: Normal information level 1: Information level set to verbose
SW bit 5: Default Environment
0: Use PROM environment variables and NVRAM settings 1: Ignore PROM environment and NVRAM and use factory default settings
Baud: 9600 Bits: 8 Parity: None Stop Bits: 1 Flow Control: None
With a serial terminal connected, pressing Ctrl-t brings up the MSC> prompt. The prompt must be brought each time a command will be entered. Successfully entered commands will return ok. Queries (for example fan) will return ok and the return value. Possible error codes:
err perm No permission to run the command. Enter Supervisor mode with the pas command first. err cmd Invalid command. err arg Invalid argument.
List of commands:
clr Resets all MSC options to their power-on defaults. This includes echo mode, no heartbeats, and so forth. ech 0 Turns off echoing as MSC commands are entered; what you type does not appear onscreen. ech 1 Turns on echoing. You see what you type. ech Toggles the echoing. (Echoing is on by default after the system is reset.) fan Checks the speed of the fans. The command displays an n if the fans are operating at a normal speed, and an h if the fans are operating at a high speed. Note that the MSC automatically switches the fan speed to high if one of the fans fails or if the ambient air temperature is too high. fan n Sets the fans to run at normal speed. fan h Sets the fans to run at high speed. nmi Sends a hardware nonmaskable interrupt (NMI) to the system. pas xxxx Enters Supervisor mode; xxxx is the four-character password for your system. The default password is “none”. pas s xxxx Sets the password to xxxx. Note that the password must be exactly 4 characters long. pwr Queries the system power state. Returns u if the power is on and d if the power is off. pwr u Turns on system power. pwr d Turns off system power. pwr d N Waits N seconds and then powers off the system. N is a hexadecimal value from 5 to 258 (5 to 600 decimal). pwr c N Waits N seconds and then powers on the system. N is a hexadecimal value from 5 to 258 (5 to 600 decimal). rst Sends a hardware reset to the system. sel Displays which CPU is currently selected to receive MSC input. Prints none if no CPU is selected. sel auto The last CPU to have output anything is automatically selected to receive MSC input (this is the power-on default). sel cpu Selects the CPU to receive input from the MSC. Anything typed on the MSC that is not an escaped command is sent through to the selected CPU. CPUs are named by node and slice. For example, sel 1a selects CPU A in node 1 for input, and sel 2b selects CPU B in node 2. see No CPU is selected to receive MSC input. see cpu Discards output from all CPUs other than a specific CPU (ordinarily, the output from all CPUs is displayed intermixed by line). CPUs are named by module and slice. For example, see 2a shows only CPU 2A's output. see all Displays output from all CPUs (this is the power-on default). tmp Displays n, h, or o, indicating whether the system is running at a normal temperature, high temperature, or seriously over-temperature (with a system shutdown impending). ver Reports the MSC firmware revision number.