Figure 17: Serial Communication Network Connection – Rs-485 Com3 - Satec expertmeter EM720 Installation Manual

R S- 48 5 /232 C o mm un ic a t ion por t ( C OM 3 – op t io n a l mod u le)
The RS-485/232 Communication port – COM3 is provided by optional modules: IRIG-B and ETH/USB
modules.
While mounting IRIG-B and ETH/USB modules in the same instrument, only one RS-485/232
Communication port can be active (COM3).
R S - 4 8 5 m o d e
In the RS-485 mode, the 485/232 terminal of the 5 pin plug-in terminal block should be remain open as
shown in figure 16
F i g u r e 1 7 : S e r i a l C o m m u n i c a t i o n Ne t w o r k C o nn e c t i o n – RS - 4 8 5 C O M 3
R S - 2 3 2 m o d e
In the RS-232 mode, the 485/232 terminal of the 5 pin plug-in terminal block should be connected to CM
as shown in figure 17
Chapter 2 Installation
5. After one minute the "LNK" GREEN LED is flashing until it lights "ON" continuously
6. The "RSSI" ORANGE LED will light "ON" or blinks, the flashing rate is proportional to
the RF receive level (RSSI), if RF receive level is high then the led is "ON"
continuously, if RF receive level is poor then the led is blinking
Each module with Communication port – COM3, provides two indication GREEN LEDS:
"RX" GREEN LED, blinking led shows receiving data at COM3
"TX" GREEN LED, blinking led shows sending data at COM3
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