Serial connections
Use a 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
field wiring diagram, Daniel Drawing DMC-005324). 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 RS-485/RS-232 terminals. The
RED wire goes to RX, the WHITE wire goes to TX, and the BLACK wire goes to COM (see
Table 3-6 for Port A wiring). RS-485, 2-wire connection on Port A, uses TX+ and TX- on the
CPU Module and has a ground wire.
When Beldon 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.
Serial Port A parameters
Table 3-4:
Port/Communi-
cation
Description
Common features
Port A (Standard)
•
RS-232
•
RS-485 Half
Duplex
•
RS-485 Full
Duplex
•
RS-485
(2-
wire commu-
nication on
Port A)
•
Typically used for general commu-
nications with a flow computer,
RTU (Modbus slave) and radios.
•
RS-485 -- 2-wire (Half Duplex) con-
nected to TX+ and TX-
•
Special override mode to force
port configuration to known set-
tings.
•
Supports RTS/CTS handshaking
with software- configurable RTS
on/off delay times.
•
Factory default is RS-232, Ad-
dress32, 19200baud
•
Communications via Daniel Me-
terLink 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
-
Parity: odd or even 1, Stop Bits
= 1
-
Baud Rates: 1200, 2400, 9600,
19200, 38400, 57600, 115000
bps
-
RTU Protocol:
-
Start Bits = 1, Data Bits =
8
-
Parity: odd or even 1, Stop Bits
= 1
-
Baud Rates: 1200, 2400, 9600,
19200, 38400, 57600, 115000
bps
Electrical installation
Installation manual
61
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