Sometimes when the RVM on the highest-numbered port goes out of service, the PMSC incorrectly reports the serial number, error text, and port number from the RVM on port 0.

The modem or serial port card doesn't fit into the PMSC.

The PMSC immediately locks up (no blinking clock) at the "WAITING..." screen after modem initialization when using the "minimal modem setup string".

What kind of modem does the PMSC support?

How do I use an external modem instead of an internal modem?

"NO MODEM INSTALLED!" or "NO RESPONSE FROM MODEM" is displayed.

The current time displayed is incorrect.

The current time is wrong after turning the PMSC off then back on.

Every time the PMSC is turned off then back on, it indicates that the number of RVMs is not set.

One or more RVMs do not show up on the status display.

The RVMs are repeatedly put into sleep mode, then waken up.

The RVMís error number is displayed, but the error text is not.


Sometimes when the RVM on the highest-numbered port goes out of service, the PMSC incorrectly reports the serial number, error text, and port number from the RVM on port 0.
[added 6/20/01] This was fixed in PMSC versions 6/19/01 and later.

The modem or serial port card doesn't fit into the PMSC.
[added 3/14/00] Loosen the 4 screws that hold the 2 gray card slots and move the slots a little. PMSCs built 3/2000 and later do not have this problem.

The PMSC immediately locks up (no blinking clock) at the "WAITING..." screen after modem initialization when using the "minimal modem setup string".
[added 3/7/00] This can occur if the modem's power-up configuration has &C0 set (should be &C1). Install the modem into a PC and run communications software such as Procomm and issue an "AT&F" command to reset the modem to factory defaults, then "AT&Y0&W0" to make this the power-up configuration. Note that the "0"s above are the number zero, not the letter O.

What kind of modem does the PMSC support?
[added 10/27/99]  An internal, 8-bit, ISA modem, preferably manufactured by Zoom. See below for how to use an external modem. 

How do I use an external modem instead of an internal modem?
[updated 2/1/00]

Turn off the PMSC and remove the internal modem.

Obtain an 8-bit ISA card (such as the Siig High Speed I/O Professional model IO-1809) containing at least one RS-232 serial communications port. The serial port must have a 16550 UART (or equivalent). You can also use a "multi-function I/O card" that may also contain parallel and game ports.

Configure the COM port for COM1 (address of 3F8H), it doesn't matter what the interrupt (IRQ) is set to. Disable all other ports and interrupts on the card.

Install the new COM port into the PMSC's modem slot.

Install a cable from the external modem into the newly inserted COM port. A null-modem adapter is not needed.

Turn on the external modem and PMSC. If the PMSC displays "NO MODEM INSTALLED!", this indicates the COM port card isn't configured properly (make sure it is set to COM1).

The current time displayed is incorrect.
Press 9 to set the time. If the time is still wrong, this may indicate that the internal clock chip is bad. Replace the PMSC if sleep mode is required, otherwise, disable sleep mode and ignore the time display.

The current time is wrong after turning the PMSC off then back on.
The battery jumper is off. PMSC versions before 9/20/98 had a bug that set the time to xx:2x on power up.

Every time the PMSC is turned off then back on, it indicates that the number of RVMs is not set.
The battery jumper is off or the battery is dead. Swap the PMSC if this canít be resolved.

One or more RVMs do not show up on the status display.
Make sure the PMSC is configured for the correct number of RVMs and all RVMs are in RS-485 mode and sequentially numbered, starting with port 00.

The RVMs are repeatedly put into sleep mode, then waken up.
The sleep and wake times must be more than 10 minutes apart.

The RVMís error number is displayed, but the error text is not.
RVM software 2/11/98 (or later) software is required.

"NO MODEM INSTALLED!" or "NO RESPONSE FROM MODEM" is displayed.
Make sure internal modem is set to COM1 (any IRQ). Reinstall modem. If the error message is still displayed, swap the modem.
If using an external modem, make sure the I/O card is set for COM1.

 

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          page last updated: 11/27/13 10:37 AM