
GASMAX CX Operation & Maintenance Manual, Revision 1.0
Page 12
CONNECTING
TO
AN
ETHERNET
NETWORK
The
GASMAX
CX
provides
a
standard
10/100
Ethernet
network
interface
on
the
Power
I/O
board
as
shown
in
Fig.
4
‐
2.
Both
DHCP
and
fixed
IP
address
modes
are
provided.
The
Ethernet
interface
provides
access
to
the
MODBUS
database
via
MODBUS/TCP
as
well
as
remote
access
and
setup
via
a
built
‐
in
web
server.
Figure 4-2 Ethernet Interface
OPTIONAL
RELAY
/
MODBUS
INTERFACE
The
optional
Relay
/
Modbus
board
is
connected
“piggyback”
to
the
back
of
the
GASMAX
CX
Display
Assembly
and
provides
three
level
alarm
relays,
a
FAULT
relay
(“K3”),
two
RS
‐
485
Modbus
RTU
serial
ports
and
access
to
the
Digital
Input
/
Remote
ACK
port.
Figure 4-3 GASMAX CX Optional Relay / MODBUS Interface
CO
M
42
0
OU
T
2
42
0
OU
T
1
PW
R
R/
P
W
R
C/
4
20
IN
1
A/
C
O
M
42
0
IN
2
CH
1
CH
2
E
‐
NE
T
LOCAL
SENSOR
TO DISPLAY
2
3
4
1
TB1
5
B
S
A
A
B
TB2
Relay
Wiring:
1
Fault
1
NC
2
Fault
1
Common
3
Fault
1
NO
4
Relay
3
NC
5
Relay
3
Common
6
Relay
3
NO
7
Relay
2
NC
8
Relay
2
Common
9
Relay
2
NO
10
Relay
1
NC
11
Relay
1
Common
12
Relay
1
NO
MODBUS
interface
Modbus
Wiring:
1
Modbus
1
A
2
Modbus
1
B
3
Shield
Tie
Point
4
Modbus
2
A
5
Modbus
2
B
Remote
Alarm
Acknowledge
S1
–
Ethernet
RJ
‐
45
Connector
NOTE:
USER
MENU
CHANGES
TO
NETWORK
SETUP
PARAMETERS
REQUIRES
A
DEVICE
REBOOT.
NOTE:
STANDARD
ETHERNET
CABLES
WITH
MOLDED
STRAIN
RELIEF
FITTINGS
ARE
NOT
RECOMMENDED
DUE
TO
SPACE
CONSTRAINTS.