2 communication, 1 ldm setup port connection, 2 modbus connection – Liebert Distribution Monitoring LDM User Manual
Page 21: Communication, Ldm setup port connection, Modbus connection
Operation
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5.2
Communication
5.2.1 LDM Setup Port Connection
Use the LDM Setup port to download and use the software from Liebert’s Web site for monitoring,
configuration and firmware upgrades (see 5.3 - Downloading the Software). This port is not a ter-
minal interface.
To connect to the LDM Setup port:
• Connect one end of a standard DB9 (female-female) null modem cable to a desktop or laptop com-
puter (PC).
• Connect the other end of the cable to the LDM Setup port on the Liebert LDM, as shown below.
5.2.2 Modbus Connection
Use the Modbus port for remote communication. The Liebert LDM supports 2- or 4-wire RS-485/422
connection (customer-installed).
To connect to the Modbus port:
• Look for Connector TB1 on the BCB. This is the RS-485 Modbus port.
• Refer to the following figure for proper connection points.
NOTE
The images above are intended for illustration only. The location of the external port may vary.
NOTE
The triangle printed on the circuit board depicts Pin 1.
Pin 5 = TX+
Triangle
indicates
Pin 1
Pin 1 = Shield
Pin 3 = TX+/RX+
Pin 2 = RX-/TX-
Pin 4 = TX-