Emerson Daniel 3814, Installation Manual

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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, Daniel Drawing DMC-004936). The
DB-9 end of the cable plugs directly into the PC running Daniel MeterLink. The three wires
on the other end of the cable 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 treenails
(
Table 3-4 for Port A wiring).
When Belden wire No. 9940 or equivalent is used, the maximum cable length for RS-232
communications at 9600 bps is 88.3 meters (250 ft.) and the maximum cable 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 values (19200 baud, address 32, RS-232). Note that the protocol is auto-
detected. This mode is expected 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
1-360-01-596) 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 configuration 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
Installation manual Electrical Installation
3-9000-760 May 2019
Installation manual 57