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CHAPTER 2: EXPANSION BUS & LCD PROGRAMMING
EXPANSION BUS
The Expansion Bus (E-bus) allows you to connect multiple Converge/Converge-Pro units together to create powerful
audio and conferencing solutions for any size venue. The E-bus is a proprietary digital audio bus that provides
control and audio data links between devices.
Expansion Bus Connections
Using the E-bus Link In and Link Out ports, you can connect up to 34 Converge Pro 880/880T/880TA/840T/8i and
Converge SR 1212/SR 1212A units, and up to 16 Converge Pro TH20 units, where the total number of microphone
inputs does not exceed 96.
Connect units in daisy-chain fashion (as shown below) using the 18” straight-through patch cable included with
each unit (Part # 830-150-004) . For larger distances between units, use CAT 5 twisted pair cable with RJ-45
connectors. The maximum cable length between connected units is 200 feet (61 meters).
VOLTAGE RANGE 100-240 VA C 2A
FREQUENCY 50Hz / 60Hz
MIC / LINE
1234
LINE IN
9101112
5678
+-
LINK IN
LINK OUT
RS-232
CONTROL / STATUS
A
B
PC
LAN
VOLTAGE RANGE 100-240 VAC 2A
FREQUENCY 50Hz / 60Hz
MIC / LINE
12341234
LINE INLINE OUT LINE OUT
5678 5678
+
-
LINK IN
LINK OUT
RS-232
CONTROL / STATUS
A
B
PC
LAN
TELCO
LINE
SET
VOLTAGE RANGE 100-240 VAC 2A
FREQUENCY 50Hz / 60Hz
MIC / LINE
12341234
LINE IN
LINE OUT
9101112
LINE OUT
9101112
56785678
+
-
LINK IN
LINK OUT
RS-232
CONTROL / STATUS
A
B
PC
LAN
VOLTAGE RANGE 100-240 VAC 2A
FREQUENCY 50Hz / 60Hz
12 12
LINE IN LINE OUT
LINK IN
LINK OUT
RS-232
CONTROL / STATUS
A
B
PC
LAN
TELCO
LINE
SET
Converge Pro 840T
Link Out
Link In
Link Out
Link Out
Link In
Link In
Converge Pro TH20Converge Pro 8i
Converge Pro 880
Audio and Control Buses
The E-bus allows audio routing between source devices and destination devices on the E-bus network. The E-bus
contains 18 independent digital audio buses labeled I–Z, which can route mic or line inputs in any combination
across the E-bus network. The E-bus also contains eight PA adapt/acoustic echo cancellation reference buses, six
global gating buses, and one control bus.
S-Z Buses: These eight buses are line input mixer buses. They are used to route auxiliary audio, such as from a CD
player or VCR, to and from other units on the network. These buses are also used as mic mixer buses when NOM
count is not required.
I-R Buses: These ten audio buses are generally used for routing microphone audio between Converge/Converge
Pro devices. Information about the number of gated microphones (NOMcount) and other relevant information for the
microphone mixers are tracked for microphones routed to these buses. By default, all microphones are routed to
the O bus.
PA Adapt/Acoustic Echo Cancellation Reference Buses: These buses allow an input from a Converge/
Converge Pro device to reference an output on another linked device for AEC and PA Adaption. See AEC Reference/
PA Adapt Reference and AEC for more information.
Global Gating Groups A-F: These buses are microphone gating groups that support first-mic priority, maximum
number of mics, etc. and work across all linked Converge/Converge Pro devices. Unlike the audio buses, they
contain only mic status and gate parameters. See the Gating and Gating Group topics for more information.
Control Bus: The control bus is an independent channel from the E-bus’s audio channel. This allows control
information to pass even if the units are not using the audio link. All models support the use of the Converge/
Converge Pro serial command set through the control bus.
VOLTAGE RANGE 100-240 VA C 2A
FREQUENCY 50Hz / 60Hz
MIC / LINE
1234
LINE IN
9101112
5678
+-
LINK IN
LINK OUT
RS-232
CONTROL / STATUS
A
B
PC
LAN
VOLTAGE RANGE 100-240 VAC 2A
FREQUENCY 50Hz / 60Hz
MIC / LINE
12341234
LINE INLINE OUT LINE OUT
5678 5678
+
-
LINK IN
LINK OUT
RS-232
CONTROL / STATUS
A
B
PC
LAN
TELCO
LINE
SET
VOLTAGE RANGE 100-240 VAC 2A
FREQUENCY 50Hz / 60Hz
MIC / LINE
12341234
LINE IN
LINE OUT
9101112
LINE OUT
9101112
56785678
+
-
LINK IN
LINK OUT
RS-232
CONTROL / STATUS
A
B
PC
LAN
VOLTAGE RANGE 100-240 VAC 2A
FREQUENCY 50Hz / 60Hz
12 12
LINE IN LINE OUT
LINK IN
LINK OUT
RS-232
CONTROL / STATUS
A
B
PC
LAN
TELCO
LINE
SET
Converge Pro 840T
Link Out
Link In
Link Out
Link Out
Link In
Link In
Converge Pro TH20Converge Pro 8i
Converge Pro 880