User's Manual

SBS-900 Shore Based Radar Systems
Chapter 10: Corrective maintenance
KH-1602-2 issue 1: Standard SBS900 Systems Operator & Maintenance Handbook
Page 205 of 240
10.8.11 NTX-A478 serial coms module
Modular interface system module (MISM) type 4 Mk2 serial coms module
Part number NTX-A478
Backplane location: B5
Overview: The serial communications module within the Radar Distribution Unit is
controlled by the backplane and provides the following interfaces:
- Three CANBus V2.0B interfaces.
- Six RS232/422 serial interfaces.
- Four opto-isolated parallel inputs and/ or relay isolated outputs.
CANBus: The V2.0B CAN bus controllers are located on the backplane; the PCB only
provides the physical interface to the external CAN bus. The board converts
and buffers the CAN bus LVTTL transmit and receive signals.
RS232/422 serial interfaces: The board has six identical RS232/422 interfaces. The LVTTL serial
transmit and receive signals on the backplane interface are configured for bi-
directional operation by a multi-protocol transceiver. Each input can be
configured by links which are MADE for RS232 and OPEN for RS422.
Parallel inputs/ outputs: The PCB has four identical parallel input/output ports. Each port can be
configured as an input and/or output, with the following options (port 1 shown
below as an example):
- Opto-isolated input, with LK10 set to Position B and LK13 OPEN.
- Isolated output, with LK10 and LK11 both set to position A, LK12 not fitted
and LK13 MADE.
- Input and output, with LK10 set to Position A and LK13 OPEN.
LEDs, links and test points
LED (green)
D
1
Lit when
internally generated +5.0V is present
Links (factory defaults in BOLD)
LK1
Open
CANBus 1 un
-
terminated
Made B@MAom 0 n_lgch[n_^ chni 01/|
LK2
Open CANBus 2 un-terminated
Made
CANBus 2 terminated into
01/|
LK3
Open CANBus 3 un-terminated
Made
B@MAom 2 n_lgch[n_^ chni 01/|
LK4
Open Serial interface 1 set to RS422 operation
Made
Serial interface 1 set to RS232 operation
LK5
Open
Serial interface 2 set to RS422 operation
Made Serial interface 2 set to RS232 operation
LK6
Open
Serial interface 3 set to RS422 operation
Made
Serial interface 3 set to RS232 operation
LK7
Open Serial interface 4 set to RS422 operation
Made
Serial interface 4 set to RS232 operation
LK8
Open Serial interface 6 set to RS422 operation
Made
Serial interface 6 set to RS232 operation
LK9
Open
Serial interface 5 set to RS422 operation
Made
Serial interface 5 set to RS232 operation