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54 CPU Module labeling and LED indicators
Section 3: Electrical installation Daniel 3812 Liquid Ultrasonic Flow Meter Installation Manual
March 2013 3-9000-765 Rev D
Serial connections
Use serial cable (Daniel P/N 3-2500-401) to connect to a PC running Daniel MeterLink. The cable
is designed for RS-232 communications which is the serial Port A default configuration (see
Appendix A field wiring diagram, D
aniel Drawing DMC - 005558). The DB-9 end of the cable
plugs directly into the PC running Daniel MeterLink. The three wires on the other end of the
c
able connect to the CPU Module. The RED wire goes to RX, the WHITE wire goes to TX, and the
BLACK wire goes to COM for the RS-485/RS-232 (Table 3-4 for Port A wiring).
When Beldon wire No. 9940 or equivalent is used, the maximum cable length for RS-232
c
ommunications at 9600 bps is 88.3 meters (250 ft.) and the maximum cabl
e length for RS-485
communication at 57600 bps is 600 meters (1970 ft.).
Port A supports a special override mode which forces the port to use known communication
v
alues (19200 baud, address 32, RS-232). Note that the protocol is auto-detected. This mode is
e
xpected to be used during meter commissioning (to establish initial communication) and in
the event that the user cannot communicate with the meter (possibly due to an inadvertent
communication configuration change). Alternately, when using Daniel MeterLink™ with an
Ethernet port, use Ethernet cable (Daniel P/N 3-3400-079) to connect the PC.
Table 3-4 Serial Port A parameters
Port/Communication Description Common features
Port A (Standard)
• RS-232
• RS-485 Half Duplex
• RS-485 Full Duplex
• Typically used for general communications
with a flow computer, RTU (Modbus slave) and
radios.
• Special override mode to force port configura-
tion to known settings.
• Supports RTS/CTS handshaking with
software-configurable RTS on/off delay times.
• Factory default is RS-232, Address 32, 19200
baud.
• Communications via Daniel MeterLink
using RS-232 or RS-485 Full Duplex
• Software configurable Modbus Address
(1-247)
• Auto-detects TCP/IP and ASCII or RTU
Protocol
- ASCII Protocol:
Start Bits = 1, Data Bits=7
1
- Parity: odd or even 1, Stop Bits =1
1
- Baud Rates: 1200, 2400, 9600,
19200, 38400, 57600, 115000 bps
- RTU Protocol:
Start Bits = 1, Data Bits=8
1
- Parity: none, Stop Bits = 1
1
- Baud Rates: 1200, 2400, 9600,
19200, 38400, 57600, 115000 bps
1. Denotes auto-detected protocols.
Ethernet
• Preferred port for diagnostic communication
via Daniel MeterLink
• 10 Mbps/100 Mbps
• Modbus TCP/IP
If not using Ethernet, a full duplex serial connection is necessary for Daniel MeterLink to
communicate with a Daniel 3812 Liquid Ultrasonic Flow Meter.