IBM 3745 Series, Hardware Maintenance Reference

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Some fields are modifiable by the CE only, some others fields are 'read only' (for
example, model).
If vital fields have been modified, returning to background causes a self-test to take
place.
The table on page 4-68 shows the various configuration fields for local LICs type 5.
Contact Sense/Operate
These facilities are not available on LIC type 5, but on remote 586Xs only. They
are:
Ÿ
Open the 'contact operate' relay
Ÿ
Close the 'contact operate' relay
Ÿ Get the status of the 'contact operate' and 'contact sense'.
Commands
The following commands can be executed in CE mode only:
Ÿ Send a 1004 Hz tone on the telephone line
Ÿ
Load the default configuration (transmit level not changed)
Ÿ Update the configuration (all fields may be updated)
Ÿ Address a specific DCE via its serial number
Ÿ Long timer (10 mn) for LLAP
Ÿ Contact sense/operate (remote only).
All the above commands are reset at:
Ÿ Power OFF
Ÿ DCE re-initialization.
Buzzer Control
Each time a valid key is pressed there is a short bip. The absence of bip means
that the key is either irrelevant to the current protocol or has not been taken in
account by the keypad hardware.
Contentions
A request to execute an LPDA-2 command can come from:
Ÿ
The local host
Ÿ The remote via the telephone line
Ÿ The panel.
Contentions are solved on a 'first request/first to be served' basis.
From the moment you release the GO key, until the end of the test, the DCE does
not answer commands either from the line or from the DTE.
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IBM 3745 Models 130, 150, 160, 170, and 17A: Hardware Maintenance Reference