4230/4232/4235 Communications modules
8-19
mixture of both Controllers and Comms modules (other than type E)
then it sends an error message upstream.
If the Comms module is connected to the computer and the System
Manager and Comms Driver are running, the upstream LEDs should
flash briefly every 10 or 20 seconds. This occurs when the Software
checks if the system is on line. If there is no activity on the upstream
LEDs then the RS232 link from the Comms module to the PC is not
cabled correctly or not configured correctly. If the upstream Tx LED is
on continuously, CTS and RTS have not been linked together on the
Comms module.
Power up (Comms modules with DIR/DIAL link set to DIAL)
A Comms module with the DIR/DIAL link on JU2 set to DIAL expects
to be connected to a powered up modem. On power up, the Comms
module monitors the modem DSR signal (which is connected to DCD
on CONN3) to check for the presence of a powered up modem. If it is
not there, the four LEDs continue flashing to alert you to the
problem. If this happens, check that the modem is powered up (its
MR light should be on) and check that its DSR signal is connected to
DCD on CONN3 of the Comms module.
When the Comms module attempts to initialise the modem, if it does
not receive valid responses from the modem it repeats the power up
process at 10 second intervals. If this happens, check all the Comms
module / modem connections. When the Comms module attempts to
initialise the modem, the TR light should be turned off for 2 second
intervals; SD and RD should flash several times.
A good initialisation sequence is indicated by the Comms module
flashing the downstream Tx LED as you would expect with a normal
Comms module initialisation, and the modem turning on its AA light
indicating that it has entered auto-answer mode.
Running
When any Comms module is running, the LEDs flash according to the
messages which are received and transmitted, upstream and
downstream. If there are no flashes on the LEDs then there is no
comms activity.
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