User's Manual

Hot Standby Operation
RFI-148 & RFI-900 High Output Power Paging Transmitters User Manual Page 48 of 134
7.2 Compatibility and Configuration
Hot Standby operation requires firmware support, specifically firmware 2.11-G and above, and an expansion
port in the transmitter (nominated during purchase with the ‘H’ order code character, see Appendix F). The
recommended configuration sequence is:
1. Check Hot Standby is supported by hardware (expansion board is present in transmitter): “ATM19”
will return “1” - Supported
a. If “ATM19” returns “ERROR”, then the firmware needs to be upgraded.
b. If “ATM19” returns “0”, then the expansion board is not present in the transmitter. Seek
clarification from STI Engineering on upgrading an existing transmitter.
2. Check connection to the RFI-PHSB: “ATM18” will return “1” - Detected
a. If “ATM18” returns “0”, then the RFI-PHSB is not detected. Ensure the expansion port DA15
connector is plugged into the RFI-PHSB.
3. Configure the required Hot Standby Mode:
a. “ATM10=0” (Disabled): The PTX is not operating in a hot standby environment and operates
as normal.
b. “ATM10=1” (Hardware Controlled): The Can Go Active signal is presented on pin 17 of the
LIU. Active High.
c. “ATM10=2” (Software Controlled): The Can Go Active signal is controlled via Hayes AT
command or Cruise Control.
4. “ATM10=x” can return “ERROR”:
a. The error code can be read with “AT%14”:
i. “1”: Not compatible with this hardware.
ii. “2”: Requires a power-on-reset to take effect.
5. Apply the Hot Standby mode configuration by resetting the PTX: “AT&T9”
6. Upon power up, check the PTX has detected its Role: “ATM13”:
a. “0”: Hot standby is not configured
b. “1”: Role is unknown, it is likely the RFI-PHSB connection is broken or communication failed
c. “2”: Role is Primary
d. “3”: Role is Secondary