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Reference Manual
00809-0100-4832, Rev AA
October 2004
2-7
Rosemount 3095FC
Table 2-3. Local Operator
Interface Port Wiring
Table 2-4. PC Comm Port
Wiring
EIA-485 (RS-485) Serial Communications - Comm 1
Use Comm 1 to monitor or alter the 3095FC from a remote site using a host or
Rosemount User Interface Software. Comm 1 supports baud rates up to
19200 bps. Comm 1 also supports the log-on security feature of the 3095FC if
the Security on Comm 1 is Enabled in Rosemount User Interface Software.
Comm 1 sends and receives messages using Modbus protocol. Comm 1
permits EIA-485 (RS-485) serial communication protocols that meet EIA-485
(RS-485) specifications for differential, asynchronous transmission of data
over distances of up to 1220 m (4000 ft). The EIA-485 (RS-485) drivers are
designed for true multi-point applications with multiple devices on a single bus.
The default values for the EIA-485 (RS-485) communications are: 9600 Baud
Rate, 8 Data Bits, 1 Stop Bit, No Parity, 10 millisecond Key On Delay, and 10
millisecond Key Off Delay. The maximum baud rate is 19200 bps. To enable or
disable the Comm 1 port, select Configure > Radio Power Control and select
the Enable (default)/Disable under Radio Power Control (see “Radio Power
Control Configuration” on page 3-23).
Wiring should be twisted-pair cable. The terminals and their functions are as
follows:
Table 2-5. EIA-485 (RS-485)
Communications Wiring
EIA-232 (RS-232) Communications - Comm 2
A EIA-232 (RS-232) communications card in the Comm 2 port can switch
power to an external communication devices, such as a radio, to conserve
power. A label on the termination board denotes the usage of each pin on the
connector.
The EIA-232 communications card meets all EIA-232 specifications for
single-ended RS-232 asynchronous data transmission over distances of up to
15 m (50 ft). The EIA-232 (RS-232) communications card defaults are: 9600
baud rate, 8 data bits, 1 stop bit, no parity, 10 millisecond Key On Delay, and
10 millisecond Key Off Delay. The maximum baud rate is 19200 bps. Refer to
Table 2-6 for communication card signals.
Signal Label
Common COM
LOI Power
(1)
(1) Do not use the LOI to power external devices.
TX + V
Common COM
Ready to Send RTS
Receive (RX) RX
Transmit (TX) TX
Signal Pin Label
Transmit (TX) 2 TX
Receive (RX) 3 RX
Ground (GND) 5 COM
Pin Function Label
1 RS-485 B
2 RS-485 A