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CHAPTER 3
C
OMMUNICATION
3.1
RS-232C
All EPM3000P and EPM300P-F instruments can be equipped with: the EIA RS-232C or the EIA RS-485.
RS-232C communication links a single instrument with a computer or device such as an RTU or PLC. Its
capability is up to 100 feet. A standard 9-pin female serial port connector mounts on the instrument for
direct connection to a computer with a 9-pin cable.
NOTE: O
NLY THREE PINS ARE USED IN
8
9
10
7
6
COMMUNICATION
5
CONVERTER
4
Model
3
SF-232DB3
2
1
DB-9 CONNECTOR
Figure 3.1 RS-232C Communication Connection Installation
NOTE: T
O AVOID GROUND LOOPS
TOGETHER AT ONLY ONE POINT
3.2
RS-485
NOTE: T
HIS SECTION APPLIES ONLY IF A COMMUNICATION OPTION WAS ORDERED
Each EPM3000P has an unique address up to four digits long. This allows the user to communicate with
up to 10,000 instruments. Standard baud rates are available up to 4800 baud. To select the proper baud
rate, apply the following rules:
The unit operates up to 4800. For a smaller number of instruments over a long distance,
use a lower baud. Optimal recommended baud rate is 1200 baud if noisy conditions
exist.
I
NSTALLATION
RS-232C. (See Figure 3.1).
BACK VIEW
RS-232 COMMUNICATION CONNECTION
11 12
13
20
21
22
23
24
25
26
27
28
A DIRECT PIN-TO-PIN CABLE CAN BE USED.
NO NULL MODEM IS REQUIRED.
,
THE NEUTRAL AND SAFETY GROUND
.
GE Industrial Systems
CONNECTION FOR DB-9 FEMALE
PIN 2 - RECEIVE OF THE HOST/COMPUTER
PIN 3 - TRANSMIT OF THE HOST/COMPUTER
PIN 5 - GROUND OF THE HOST/COMPUTER
5 4 3 2 1
9 8
7
6
(
3)
PIN
SHOULD BE CONNECTED
.
DETAIL OF DB-9
LAPTOP
10
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