MRV Communications LX-4000 Series manual Typical Interface Design for Control Output Signals

Alternative Port Capabilities

•The states are undefined upwards of 30 Seconds + the Boot Delay Timer value in some configurations, i.e. the signals are non-latching through power cycles.

•Note that negative voltage could be present on the interface until the software is completely initialized.

•Control Outputs in the LX-Series guarantee ±5.0V drive into a 3K Ohm load.

•External loading below 3K Ohm can be tolerated but under no circumstances should the device load the LX-Series output below ±2.5V/7.6mA absolute maximum drive.

•A common Signal Ground is required.

•The MRV Corporation IR-7104 family can provide true Form C SPDT Relay outputs rated to 30VDC/1A per contact if higher capacity and stable contacts are required through restart and power cycles.

Figure 21 - Typical Interface Design for Control Output Signals

You must change the LX-Series port access type to control to utilize DTR and RTS as the Control Outputs. For example:

InReach:0>> config port async # access control

If you want the DTR signal to be asserted High (positive voltage) on the port:

InReach:0>> control port async # dtr high

Refer to the LX-Series Configuration Guide for a detailed explanation of the commands to set up a port in the Control function.

44 MRV Communications, Inc. www.mrv.com 451-0308