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Operations Manual, HPA2, Compact Outdoor SSPA 205486 REV F 117
Baud Select Lines on J4, Monitor & Control Connector
Pins j and e of M&C connector J4 allow the user to have some control over the serial
interface, bypassing EEPROM settings for Protocol, Baud Rate or Network Address. This
feature becomes important if the user accidentally selects the wrong protocol or baud rate of
the SSPA and wants to revert the unit to a known state.
These pins have internal pull-ups and if left disconnected will remain in logic high state. The
reverting function of the SSPA is active only on initial power-up. Any alterations to the pins’
state after start-up will allow the SSPA to use internal EEPROM settings to select the baud
rate and protocol. These pins also are used automatic addressing. This option will work with
I/O board firmware levels of 3.50 or later. Do not attempt to activate this option on units with
earlier firmware versions!
To revert an SSPA to a known interface state, complete the following steps:
1. Turn off the SSPA;
2. Establish wire jumpers to the M&C connector J4 according to the desired protocol
selection (See Table C-1);
3. Turn on SSPA and remove the jumpers;
4. Connect to SSPA over serial protocol and select the desired settings for protocol
and baud rate. Settings will take effect after next SSPA power-up.
To turn on automatic addressing:
1. Connect to the SSPA over serial interface;
2. Set the SSPA unique network address to 170 (Hex 0xAA)
3. Cycle the unit’s power. The unit will start with default baud rate of 9600 and
Standard String Protocol selection. Pins j and e now will determine the SSPA
unique address (See Table C-2).
Jumper 1 Jumper 2 Selected Protocol Selected Baud Rate
j-d e-V Standard String Protocol (see Section 10) 9600
none e-V Standard String Protocol (see Section 10) 38400
j-d none Binary Protocol compatible with CO SSPA with
serial number 100,001 - 199,999
38400
none none Settings last saved to EEPROM EEPROM setting
Table C-1: Baud Rate and Protocol Reverting Options
Table C-2: Unique Network Address Hardware Select †
Jumper 1 Jumper 2 SSPA unique address
j-d e-V 1
j-d none 2
none e-V 3
none none 4
† SSPA address in EEPROM must be selected to 0xAA in order to activate this option.
Appendix C: Baud Select Lines on J4