Emerson Rosemount 700XA Reference Manual page 63

Reference Manual
2-3-9000-744
Table 4-1: Maximum distance for each communication protocol
(continued)
Communication protocol
Ethernet (CAT5)
4.4.5 RS-485 serial port terminating resistors
To ensure correct communication with all hosts, place a 120-ohm terminating resistor
across the gas chromatograph (GC) serial port terminals on the RS-485 link. On a
multi-dropped link, install the terminating resistor on the last controller link only.
4.4.6 Installing and connecting to an analog modem card
The Rosemount 700XA has two slots (I/O Slot A and I/O Slot B) in the card cage for
installing an analog modem.
NOTICE
Rosemount MON2020 only recognizes Microsoft Windows
have all relevant drivers installed correctly.
NOTICE
Analog modems will only work with PSTN phone lines. Analog modems will not work with
VOIP networks.
The following four LEDs are provided on the modem for troubleshooting:
RI (Ring indicator) This LED flashes when it senses a ring. This LED should only flash
CD (Carrier detect) This LED glows green while connected to Rosemount MON2020.
RX (Receive)
TX (Transmit
Install the analog modem
Procedure
1. Start Rosemount MON2020 and connect to the gas chromatograph (GC).
2. Go to Tools → I/O Cards....
3. Change the Card Type for the appropriate in/out (I/O) slot to Communication
4. Click Save.
Rosemount 700XA
once per connection, because the modem automatically answers
on the first ring.
This LED flashes while the gas chromatograph (GC) receives data
from Rosemount MON2020.
This LED flashes while the GC sends data to Rosemount MON2020.
The I/O Cards window displays.
Module - Modem.
Maximum distance
300 ft (91 m)
Installation and start-up
June 2022
®
-compatible modems that
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