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201627 REV X
4 RU SSPA Chassis Operations Manual
2.1.2.7 Serial Main (J4)
A DB9 female connector serves as primary remote control interface connector. The
interface is re-configurable through the front panel or can be used as a RS-232 or
RS-485 interface (2 or 4 wires). The RS-485 TX and RX pairs must be twisted for
maximum transmission distance. A user-configurable 120-ohm termination resistor is
provided on the same connector.
Table 2-2
shows the Serial Main (J4) connector pin outs.
2.1.2.8 Serial Local (J5)
This DB9 male connector is used in advanced system integration and for system
debugging purposes. Leave unconnected unless specified otherwise.
2.1.2.9 Program Port (J6)
A DB25 male connector is used to provide on field flash re-programmability for the
HPA controller card. In order to reload controller board firmware, connect this port to a
PC Parallel port through straight through cable. For a full description, see
Section 3
,
Troubleshooting and Maintenance
.
2.1.2.10 Parallel I/O (J7)
A DB37 female type connector, the Parallel I/O port contains a series of contact
closures for monitoring HPA faults as well as opto-isolated inputs for controlling some
HPA functions. Inputs react on the closure to ground. The minimal closure time is
50mS. See
Table 2-3
for a description of the pin-outs for this connector.
Table 2-2: Serial Main (J4) pin outs
Pin # Function / Description
1
RS485 TX+ (HPA Tr)
2
RS485 TX- (HPA Transmit -)/RS232 TX
3
RS485 RX- (HPA Receive -)/RS 232 RX
4
RS485 RX+ (HPA R)
5 GND
6
Service Request 1 Form C relay NC contact (Closed on HPA Summary Fault)
7
Service Request Common Form C relay common contact
8
Service Request 2 Form C relay NO contact (Opened on HPA Summary Fault)
9
120 ohm termination (must be connected to pin 4 to enable termination)
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