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Installation Guide
T942C- and T942C/2 Central Unit
2003-01-08 / Rev.C
J04: For connection of A, C, or D-bus via twisted-pair wiring when modular bus
cabling cannot be used.
J05: Connects between two T942Cs only when speech between two separate
paging system installations is used (SBS-bus).
J06: Connector used only in speech systems for connection to the speech bus
(SP-bus) when system bus cable is not used.
J07: Modular jack for connection of E and ER-buses and Data Link.
J08: Modular jack for connection of A, E and ER-buses.
J09: Modular jack for connection of PC-line, directly or via modem.
J10: Connector where a relay output is available for system fault indication and
Central Unit malfunction indication. Several parameters in the Central Unit
software determine how the output is to be used. When the Central Unit
and system are operating properly, the relay is actuated, the contacts for the
output close, and LED06 lights steadily.
J11: Connector for 4 external digital 12 V DC inputs. Inputs 2 and 3 are not used.
Input 1 is used for monitor receiver H/U989M.
Input 4 is used for absent indication from charging racks in teleCOURIER
800 system.
J12: Connector for 4 external digital outputs (12 V DC) of type open collector.
Output 1 is used only in paging systems for connection of Reference Module
T938RM.
Output 2 (and GND) is used to indicate that paging transmitter is
transmitting.
Output 3 is used to indicate Central Unit malfunction. As long as the Central
Unit is working properly, the output is low.
Output 4 is not used.
J13: Used for diagnostic testing.
J14: Modular jack for connection of D, C, and DR-buses, and AUX RELAY.
Jumpers
S01 Push button to manually restart the MP.
S03 2-pin connector, must be jumpered to connect RAM back-up battery.
S04, S18, Jumper points, connect RX for data link (DLRX). (Only when used as CEI)
S19
S05 Jumper points, connect +6 V to absence line for rack scanning. (Only when
used as CEI)
S06, S07 Jumper points, connect TX for data link (DLTX). (Only when used as CEI)
S08 Jumper points, connect Code 1 for rack scanning. (Only when used as CEI)
S09 Jumper points, connect Code 2 for rack scanning. (Only when used as CEI)
S10A Jumper. Normally must be set to position 1-2 to connect 1 kohm matching
resistor across AUX SP bus. (Not used in CTS.)
S10B Jumper. Normally must be set to position 1-2 to select normally closed
contact of AUX RELAY RE02. (2-3 selects normally open contact.)
S16 Not used.
S17A Jumper. Set to 1-2 to select RS422 for CTS or set 2-3 to select RS485 for the
paging systems and the PSS.
S17B Jumper. Set to 2-3 to select RS422 for CTS or set 1-2 to select RS485 for the
OSP and the PSS.
Switches
SW01 Address selector switch for the C-bus. If the setting of SW1 is changed the
Central Unit must be restarted for the change to become effective.
TD 91684GB
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