AMG AMG5514R Instruction Manual Download Page 6

AMG Systems Ltd. reserves the right to make changes to this 
document without notice. The information herein is believed to 
be accurate. No responsibility is assumed by AMG for its use.  

Page 6 of 8 

AMG5514R Instruction Sheet D17366-
00.doc 
 

 

 

Data and Alarm Channel Configuration 

The 

AMG5514R 

sends and receives data to/from a 

AMG5513

 transmit unit. The physical data 

interface RS-485, RS-422 or RS-232 is individually selectable by the user with the corresponding slide 
switch mounted on the main PCB inside the enclosure.  
 
One bi-directional alarm is also provided. The alarm input is typically connected to a contact closure 
switch. The alarm output can receive an on/off signal from an 

AMG5513

 and is typically used to 

convey contact closure status.  
 

 

 

 

 

Data Channel Configuration 

Each low speed data channel provides an RS-232, RS-422 (full duplex, four wire) or RS-485 (half 
duplex, two wire) interface defined by the corresponding mode switch inside the enclosure. Every data 
channel as shipped from the factory is set up for RS-485 operation unless otherwise requested. 
 
The data input for both the RS-485 and the RS-422 modes detects a tri-state input condition by 
monitoring the differential voltage level across the input. A differential level below 600mV positive or 
negative will be detected as a tri-state condition. A level above 600mV positive or negative will be 
detected as a logic 1 or logic 0 respectively. It is important therefore to terminate the RS-485 bus or 
the RS-422 input bus using 120

 if a pre-bias is present on the RS-485 or RS-422 bus.  

 
A large number of third party equipment manufacturers apply a pre-bias on their RS-485 bus. This pre-
bias is applied by pulling one arm of the RS-485 bus high (+5 volts) and the other arm low (0 volts) 
using high value resistors within the third party equipment. In order to ensure that the AMG equipment 
detects a tri-state condition, then these resistors should have a value above 5k

.  If the third party 

bias resistors are less the 750

 the bus can be multiple terminated as required to ensure that a tri-

state level is detected. 
 

Summary of Contents for AMG5514R

Page 1: ...ata Channel and one Bi directional Alarm for a Singlemode Fibre Link The AMG5514R is a rackmount receive unit designed to transmit and receive 1 data signal plus 1 Bi directional alarm over one Single...

Page 2: ...ctional Schematic 3 Optical Connection 3 Connections 4 Optical Connections Singlemode 4 Power Connection 4 Data and Alarm Channel Connections 4 Front Panel Indicators 5 Power Opto LED 5 Low Speed Data...

Page 3: ...ion Unit Functional Schematic The AMG5514R transmits 1 data channel and 1 uni directional alarm signal to the AMG5513 transmit unit It also receives 1 data channel and 1 Bi directional alarm transmitt...

Page 4: ...mum Optical Dynamic Range 20dB Power Connection Power supply From plug in connection on the AMG2009 or AMG2015 subrack Power consumption 3 0 Watts max Data and Alarm Channel Connections No of Data Cha...

Page 5: ...n on IN IN Data Present IN RS232 Green logic zero V present on input IN Red logic transitions present on input IN Off logic one V present on input IN IN corresponds to the data signals being transmitt...

Page 6: ...e the enclosure Every data channel as shipped from the factory is set up for RS 485 operation unless otherwise requested The data input for both the RS 485 and the RS 422 modes detects a tri state inp...

Page 7: ...IN OUT B OUT B OUT Note A or B in brackets in the above table refers to RS 485 RS 422 data specification Alarm Channel Configuration The AMG5514R provides one bi directional alarm output contact clos...

Page 8: ...practice when working with optical fibre systems This includes Do not stare with unprotected eyes or with any unapproved collimating device at fibre ends or connector faces or point them at other peo...

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