MRV Communications LX-4000 Series - Manual (Page 44)

Alternative Port Capabilities
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MRV Communications, Inc. www.mrv.com 451-0308
• 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.