Pinout Guides
6.0PINOUT GUIDES
6.1Modem Setup and Pinout Guide
The OpenComms EM must be connected to a modem to send pager alerts when a sensor reading crosses a
The unit is compatible with modems that have DB9 or DB25 serial COM ports. A proper cable must be constructed to allow communication between the unit and the modem. This cable connects the RJ45 connector labeled Modem on the back of the unit to the serial port on the modem.
Refer to Table 13 for a pinout guide for building the correct cable. For more information on construct- ing this type of cable, call Liebert Monitoring Application Support at
Table 13 OpenComms EM to DCE modem pinout guide
RJ45 Pin # | Signal Name | Description | DB25 Pin # | DB9 Pin # |
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1 | DTR | Data Term Ready | 20 | 4 |
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2 | CTS | Clear to Send | 5 | 8 |
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3 | GND | Signal Ground | 7 | 5 |
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4 | TXD | Transmit Data | 2 | 3 |
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5 | RXD | Receive Data | 3 | 2 |
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6 | CD | Carrier Detect | 8 | 1 |
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7 | RTS | Request to Send | 4 | 7 |
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8 | DSR | Data Set Ready | 6 | 6 |
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6.2Contact Closure Cable Pinout Guide
All OpenComms EM models can accommodate a contact closure cable in either sensor port. Contact closure cables are available separately from Liebert in various lengths (see Table 3).
To make your own contact closure cable, refer to Table 14 for the pinout for this cable.
•Pin 2 is the contact that may be defined as either Normally Open or Normally Closed.
•Pins 6 and 8 must be tied together to form the common.
Table 14 Contact closure cable pinout
OpenComms EM RJ45 | |
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1 | — |
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2 | Normally Open or Normally Closed |
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3 | — |
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4 | — |
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5 | — |
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6 | Common - tied to Pin 8 |
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7 | — |
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8 | Common - tied to Pin 6 |
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6.3Serial Cable Pinout Guide (EM PDU & vEM-14 Controllers)
The serial cable included with OpenComms EM PDU and
To make your own cable, refer to Table 15 for the pinout for this cable.
Table 15 Serial cable pinout - MP Advanced Power Strip
OpenComms EM RJ45 | MP Advanced power strip |
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1 | 8 |
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2 | 3 |
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3 | 2 |
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4 | 5 |
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5 | 4 |
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6 | Not Connected |
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7 | Not Connected |
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8 | 1 |
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