3 RU SSPA Chassis Operations Manual
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2.1.2.6 Serial Main (J4) [DB9 (F)]
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 max-
imum transmission distance. A user-configurable 120-ohm termination resistor is pro-
vided on the same connector.
Table 2-2
shows the Serial Main (J4) connector pin outs.
2.1.2.7 Serial Local (J5) [DB9 (M)]
This DB9 male connector is used in advanced system integration and for system
debugging purposes. Leave unconnected unless specified otherwise.
2.1.2.8 Program Port (J6) [DB25 (M)]
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
.
2.1.2.9 Parallel I/O (J7) [DB37 (F)]
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
RS-485 TX+ (HPA Tr)
2
RS-485 TX- (HPA Transmit -)/RS-232 TX
3
RS-485 RX- (HPA Receive -)/RS-232 RX
4
RS-485 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)
Содержание HPAC-2005
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