Black Box AC1120A User Manual

 

 

The main RS-232 port is on a screw terminal and the auxiliary port is on an RJ45.  
 

Since the matrices with the IP control and those without both have an 
RJ45 connector next to the RS-232 screw terminal, it is easy to 
confuse their function. The function of the connector should be labeled 
above it. A sure way to tell if the RJ45 control input is LAN or Serial is 
by the existence of little LED indicators to the sides of the connector. If 
the connector has these lights, then it is a LAN connection, otherwise it 
is an RS-232 serial connection. 

 Figure 6 – IP input versus Auxiliary RS-232 

 
2.4.1.1 Primary RS-232 Control Port 
This is a 3-terminal captive screw input. A detachable mating connector is 
provided. The function of each pin is designated on the panel above the 
connector. Below is a diagram for connection this port to a PC’s DB9 serial port. 

 Figure 7 – Primary RS-232 to PC cable 

2.4.1.2 Auxiliary RS-232 Control Port 
The matrix switches without IP control have a secondary serial port that can work 
independently of the primary port. The user can control the matrix from either or 
both ports. 
The auxiliary RS-232 is on an RJ45. Make sure to not connect this to any LAN 
devices. The pinout for the auxiliary RS-232 follows the basic EIA-561 for TX 
RX and Ground. Optional current limited 12v DC may also be provided (max 
rated output current of 50ma) that can be used to power external keypads or 
control devices. 
 

Never open the unit’s cover. Lethal voltages exists inside the unit 
Opening the unit also voids the warranty on the unit. 

 
The pinout is shown below.