Crestron cen-io User Manual

Crestron CEN-IO 

Ethernet Input/Output Module

I/O (1 - 8, G) 

This 9-pin connector (eight input/outputs and one common) is used to detect digital 
and analog input/output levels. The contact closures to ground current is 2.5mA. 
Port recognizes input/outputs compatible with TTL and CMOS digital signals and 
can tolerate up to 24V DC. Threshold is 2.5V. Input/outputs can also measure analog 
voltages from 0 to 10V DC.  

RELAY OUTPUT (1 - 8) 

This 12-pin connector provides eight normally open relays. Two relays share a 
common ground. Each relay closure is rated at 24V DC/AC, 1A.  

UNMARKED (Ethernet - on front panel) 

This RJ45 connector provides Ethernet connection, thereby making the unit IP 
addressable and compatible with 10BASE-T Ethernet systems. The Ethernet port is 
the standard 10BASE-T pinout. Refer to the pinout table after this paragraph.  

1

TD+

2

TD-

3

RD+

4

No Connect

5

No Connect

6

RD-

7

No Connect

8

No Connect

 

There are 21 LED indicators located on the front panel of the CEN-IO. Refer to the 
illustration and descriptions below.  

 

PWR (Power) 

This LED illuminates when power is supplied to the CEN-IO.  

RXD (Ethernet) 

This LED illuminates during reception of Ethernet data by the unmarked Ethernet 
port on the front panel.  

TXD (Ethernet) 

This LED illuminates during transmission of Ethernet data from the unmarked 
Ethernet port on the front panel.  

LNK (Ethernet) 

This LED illuminates when there are attachments to the Ethernet port.  

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