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Form 201.28-NM1.1
Issue date: 08/06/2021
SC-EQ or E-Link BAS communications card
Received data (Control data)
The chiller receives eight data values from the SC-EQ or
E-Link. The first four are analog values and the last four
are digital values. These eight data values are used as
control parameters when in REMOTE mode. When the
unit is in LOCAL mode, these eight values are ignored.
If the unit receives no valid YorkTalk 2 transmission for
5 minutes it will revert back to all local control values.
Table 13 on page 114 lists the control parameters.
031-03478-xxx
Control Board
J16
1
2
3
4
TB1
Connect to printer
Figure 28 - LON E-Link gateway option
JOHNSON CONTROLS
LON E-link gateway option
RS - 485
SHLD
RS - 485
1
GND
2
485+
3
485-
4
+5V
5
TB2
PORT
2A
+12V
1
1
GND
2
2
5
6
LON E-Link or SC-EQ interface requires communication
port set for YorkTalk2. See Table 11 on page 111 for settings.
Transmitted data
After receiving a valid transmission from the SC-EQ or
E-Link, the chiller will transmit either operational data
or history buffer data depending on the History Buffer
Request, ENG PAGE 10, found in Table 13 on page
114. Data must be transmitted for every page. If there
is no value to be sent to a particular page, a zero will be
sent. Table 13 on page 114 shows the data values and
page listings for this unit.
E-LINK GATEWAY
PORT 4
A
LON FTT10
SHLD
B
COMM
-
+
RS - 485
SHLD
COMM
-
+
J1
PORT
1
SECTION 7 - OPERATION
Connection to BACnet, Modbus
or N2 BAS network (Refer to
ELINK Installation Manual
P/N 24-10404-9 for
Installation Requirements.)
LD22443
7
113
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