Emerson SiteLink-12E - Manual (Page 16)

Communication and Control Wiring
12
4.4.3 Wiring Port S1 for RS-232
When connecting the Liebert SiteLink-E Port S1 to a third-party device that uses RS-232:
• Liebert recommends using 18-28AWG wiring.
• Most RS-232 cables are not twisted pair, but twisted-pair wiring is acceptable.
• The distance from the Liebert SiteLink-E to the RS-232 BMS interface should not exceed 50 ft.
(15.2m).
To connect a third-party, RS-232 device to Port S1:
1. Be sure that power to the Liebert SiteLink-E module is Off before beginning to connect wiring.
2. Check the communication wiring for shorts and grounds.
3. Set the RS-232 or RS-485 jumper to RS-232.
Refer to Figure 11 and to the labels on the Liebert SiteLink-E housing.
4. Connect the communication wiring to the control module’s screw terminals labeled Tx, Rx, and
Signal Ground on Port S1, and jumper the DTR and DCD terminals.
Refer to Figure 11 and to the labels on the Liebert SiteLink-E housing.
5. Set the MS/TP on S1 DIP switch 4 to Disable (Off).
The DIP switches are at the top of the Liebert SiteLink-E module, near the battery; see Figure 1
for the DIP switch location and Figure 11 for setting positions.
6. Set the PTP on S1 DIP switch 5 to Enable (On).
Figure 12 RS-232 connection to Port S1
4.5 Wiring a Modem for Half-Router Communication—Port S1
1. Turn Off power to the Liebert SiteLink-E.
2. Connect the modem to Port S1 using a standard modem cable connected to an S2-DB9 adapter,
available from Liebert, or a cable made using the wiring diagram in Figure 13.
3. Set the PTP on S1 DIP switch to Enable (ON).
Refer to Figure 11 for determining the wiring connections.
Figure 13 Fabricated cable for modem in half-router communication
NOTE
Use the same polarity throughout the network segment.
Use the same baud rate for all control modules on the network segment.
Third-Party
Network
RS-232
Point-to-Point
TX 1
RX 2
* DTR 3
* DCD 4
GND 5
3 RX
T2 X
20 DTR * †
8 DCD * †
7 GND
* Wire connection usually not needed
** Needed only if hardware handshaking is used
† DCD can be hooked up to the DTR signal for
self-handshaking
Port S1 (5-Pin) Modem (25-Pin)