TD 91684GB
16 April 2015 / Ver. G
Installation Guide
T942C and T942C/2 Central Unit
5
Connectors
J01, J02: Modular jacks for connection of system bus cabling.
J03: Supply voltage.
J04: For connection of A, C, or D-bus via twisted-pair wiring when modular bus
cabling cannot be used.
J05: Not used.
J06: Not used.
J07: Not used.
J08: Modular jack for connection of A-bus.
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 to 4 are not used.
Input 1 is used for monitor receiver H/U989M.
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 the H/U952T Terminal
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.
Jumper points and push buttons
S01 Push button to manually restart the MP.
S03 2-pin connector, must be jumpered to connect RAM back-up battery.
S04, S18,
S19
Not used.
S05 Not used.
S06, S07 Not used.
S08 Not used.
S09 Not used.
S10A Jumper. Normally must be set to position 1-2 to connect 1 kohm matching
resistor across AUX SP bus.
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. Always set to 2-3 to select RS485 for the Ascom Paging System.
S17B Jumper. Always set to 1-2 to select RS485 for the Ascom Paging System.
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