User's Manual

044-xxxxx Rev. x 2-6
2-9. IIC, RS485, POWER, AND OTHER SIGNALS CONNECTOR P5
The alarms and sensing connections on the amplifier are made through a 18-pin micro-fit
connector (figure 2-5) and are listed and described in table 2-5.
Figure 2-5. IIC, RS485, Power, and Other Signals Connector P5
Table 2-5. IIC, RS485, Power, and Other Signals Connector P5 Definition
PIN SIGNAL DESCRIPTION
1 FORCE_ON+
Turns on LEDs (in the AIM) during power up sequence;
routed directly from MTRM connector to fan assembly /
AIM connector
2 FORCE_ON-
Turns on LEDs (in the AIM) during power up sequence;
routed directly from MTRM connector to fan assembly /
AIM connector
3 +ALLOW_HPA_ENABLE
Enables MCPA when high. Requires enable command
via RS485 and HW_ENABLE high impedance to ground
and no shutdown conditions exist.
4 -ALLOW_HPA_ENABLE
Enables MCPA when high. Requires enable command
via RS485 and HW_ENABLE high impedance to ground
and no shutdown conditions exist.
5 MCPA_TX+ Differential RS485 link to MTRM
6 MCPA_TX- Differential RS485 link to MTRM
7 MCPA_RX+ Differential RS485 link from MTRM
8 MCPA_RX- Differential RS485 link from MTRM
9 IIC_CLK+ Differential IIC clock from MTRM
10 IIC_CLK-
D
D
i
i
f
f
f
f
e
e
r
r
e
e
n
n
t
t
i
i
a
a
l
l
I
I
I
I
C
C
c
c
l
l
o
o
c
c
k
k
f
f
r
r
o
o
m
m
M
M
T
T
R
R
M
M
11 IIC_RX_DATA+
D
D
i
i
f
f
f
f
e
e
r
r
e
e
n
n
t
t
i
i
a
a
l
l
I
I
I
I
C
C
r
r
e
e
c
c
e
e
i
i
v
v
e
e
d
d
a
a
t
t
a
a
(
(
f
f
r
r
o
o
m
m
M
M
T
T
R
R
M
M
)
)
12 IIC_RX_DATA-
D
D
i
i
f
f
f
f
e
e
r
r
e
e
n
n
t
t
i
i
a
a
l
l
I
I
I
I
C
C
r
r
e
e
c
c
e
e
i
i
v
v
e
e
d
d
a
a
t
t
a
a
(
(
f
f
r
r
o
o
m
m
M
M
T
T
R
R
M
M
)
)
13 IIC_TX_DATA+
D
D
i
i
f
f
f
f
e
e
r
r
e
e
n
n
t
t
i
i
a
a
l
l
I
I
I
I
C
C
t
t
r
r
a
a
n
n
s
s
m
m
i
i
t
t
d
d
a
a
t
t
a
a
(
(
t
t
o
o
M
M
T
T
R
R
M
M
)
)
14 IIC_TX_DATA-
D
D
i
i
f
f
f
f
e
e
r
r
e
e
n
n
t
t
i
i
a
a
l
l
I
I
I
I
C
C
t
t
r
r
a
a
n
n
s
s
m
m
i
i
t
t
d
d
a
a
t
t
a
a
(
(
t
t
o
o
M
M
T
T
R
R
M
M
)
)
15 +5V_DC_IN
+5V supply voltage for the IIC circuit on MCPA; not used
in any other circuits.
16 +5V_DC_RTN
+5V supply voltage return for the IIC circuit on MCPA; not
used in any other circuits.
17 CABLE_DETECT
Cable detect line connected to GPI/O port of MTRM
microprocessor. Pulled high via +5V_DC_IN; connected
to reset pin on microcontroller to allow MTRM reset if
necessary.
18 HW_ENABLE
Hardware enable signal. MCPA enabled when shorted to
chassis ground.