AQUA M A STE R4
| EL EC T R O M AG N E T I C FLO W M E T ER T R A N SM I T T ER | O I/FE T4 0 0 - EN R E V. D
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Table 3 Connector input/output connections
( Pulse / Modbus*)
Pin
Signal
Function
Color (output cable)
A
D0
Data D0
Violet
B
D1
Data D1
Blue
C
O/P COM
Output common
Yellow
D
O/P2
Reverse pulses
Red
E
O/P3
Alarm output
Brown
F
O/P1
Forward pulses
Orange
G
0V
Signal ground
Screen
* Refer to COI/FET400/MODBUS-EN for Modbus only
Pulse outputs
IMPORTANT (NOTE)
Outputs 1 and 2 are polarity-sensitive. The common
connection for these outputs is designated ‘COM’ and
is the negative connection.
OV* (–)
COM
O/P1 (+)
O/P2 (+)
COM (–)
O/P1 (+)
O/P2 (+)
Common
Input 1
Input 2
For example, telemetry, electronic and counters
Counter/Totalizers
Forward flow
Reverse flow
PLC or Datalogger
*Optional link for grounding floating
output – see
Note
above.
Figure 48 Pulse output connections
Alarm interface
IMPORTANT (NOTE)
Output 3 is not polarity-sensitive. The common
connection for these outputs is designated ‘COM’.
Figure 49
COM
O/P3
Common
Alarm input
Alarm output connections
MODBUS connection
This section describes the AquaMaster4 MODBUS serial data
communications option and must be used in conjuction with
Communication Supplement COI/FET400/MODBUS.
Detailed specifications and recommendations for using and
implementing MODBUS communications are contained in the
following external publications – refer to
• "MODBUS over Serial Line – Specification and
Implementation Guide V1.02" – For hardware, cabling,
grounding and shielding
• "MODBUS Application Specification V1.1b"
Figure 50 MODBUS connection
IMPORTANT (NOTE)
A USB Comms lead driver is required when using
WEBC2100 – download from
www.ftdichip.com/FTDrivers.htm
The Modbus protocol is an unsecured protocol, as
such the intended application should be assessed to
ensure that these protocols are suitable before
implementation.
A
B
C
D
E
F
G
Ordering code
3KXF208400L0600
USB connector
Pin
Modbus
A
D0
B
D1
C
Not used
D
Not used
E
Not used
F
Not used
G
Common
MODBUS connector
