Fire-Lite ECC-50 Instruction Manual page 16

Product Description
External Data Bus (EIA-485) - TB12, Terminals 2 (B), 3 (A), 4 (BRTN), 5 (ARTN), &
1 (SHLD)
Data connections for external operator interface components
Redundant transceiver circuitry for Class A operability
Power-limited (Class 2) circuitry, supervised
Maximum wiring impedance: 13.2 
FACP Data Bus (EIA-485) - TB13, Terminals 1 (B IN), 2 (A IN), 3 (B OUT), & 4 (A OUT)
Dedicated connection to FACP serial bus
Output terminals: pass-through to other system components
Isolated, supervised
Minimum isolation withstand voltage: 1500 V
Maximum wiring impedance: 40  (ANN-BUS)/26  (ACS BUS)
External Audio Riser TB22, Terminals 1 (OUT+), 2 (OUT-), 4 (IN+), 5 (IN-), & 3 (SHLD)
Style Y (Class B) or Style Z (Class A) audio connections to external operator interface components
Power-limited (Class 2) circuitry, supervised
Audio signal level: 3.85 V
Frequency range: 800 - 2,800 Hz
Frequency range (ECC-50/125DA): 800 Hz - 2.8 KHz
NOTE: Zero impedance to ground will cause a ground fault.
16
RMS
, maximum
RMS
Emergency Command Center Manual — P/N LS10001-000FL-E:D 9/3/2014
Input/Output Circuit Specifications