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114 RS-485 serial connection setup
Section 5: Startup and meter configuration Reference, Installation, and Operations Manual
June 2013 3-9000-743 Rev S
RS-485 serial initial connection steps
1. Power up the Daniel Mark III Ultrasonic Gas Flow Meter meter and the PC.
2. Plug the DB-9 end of the cable directly into the PC running Daniel MeterLink. The three
wires on the other end of the cable connect to J7 (Field Connection Board) for Port B.
The Digital Out wire goes to J7-Pin1, the Digital In wire goes to J7-Pin2, and the
COMMON wire goes to J7-Pin3.
3. Run Daniel MeterLink on the PC and create a new meter directory record with the
following parameters:
a. Select
Meter Type as Mark III.
4. Check the
Direct box and uncheck the Modem and Ethernet boxes.
5. Click the
Direct button and set the Direct connection properties for Baud Rate of 19200
and
Comms Address (Modbus ID) of 32.
6. Configure the Mark III Port A for RS-485 operation use the following instructions.
a. To configure Port A for RS-485 Full Duplex operation, set the CPU board and Field
Connection board switches as indicated in the table below (see Figure 3-24 for
switch bank locations):
Table 5-6 Serial Port A RS-485 Full duplex configuration switch settings
Board Switch Position
CPU S3-1 RS485
S3-2 RS485
S3-3 RS485
S3-4 RS485
S5-1 FULL
S6-1 RS485
S6-2 RS485
Field Connection Termination ON Termination OFF
S1-1 TERM ON (RX) TERM OFF (RX)
S1-2 TERM ON (TX) TERM OFF (TX)
S1-3 FULL DUPLX
S1-4 FULL DUPLX