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3.5.4 Maximum effective distance by communication
protocol type
The table below lists the maximum distance at which the indicated protocol can transmit
data without losing effectiveness. If longer runs are required, the use of a repeater or other
type of extender will be necessary to maintain the protocol's efficiency.
Communication protocol Maximum Distance
RS-232 50ft (15.24m)
RS-422/RS-485 4000ft (1219.2m)
Ethernet (Cat5) 300ft (91.44m)
3.5.5 RS-485 serial port terminals
To ensure correct communication with all hosts, place a 120-ohm terminating resistor
across the GC serial port terminals on the RS-485 link. On a multi-dropped link, install the
terminating resistor on the last controller link only.
3.5.6 Installing and connecting to an analog modem card
The 700XA has two slots—I/O Slot A and I/O Slot B—in the card cage for installing an analog
modem.
Note
MON2020 only recognizes Microsoft Windows-compatible modems that have all relevant drivers
installed correctly.
Note
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 once per connection because the modem automatically answers on the first
ring.
• CD (Carrier Detect) - This LED glows green while connected to MON2020.
• RX (Receive) - This LED flashes while the GC receives data from MON2020.
• TX (Transmit) - This LED flashes while the GC sends data to MON2020.
Installing the analog modem
To install an analog modem, do the following:
Installation and setup
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Installation and setup
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