Eurotherm 6100, Руководство пользователя

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100/180MM DISTRIBUTED GRAPHIC RECORDER: USER GUIDE
Page 6 HA029324
Issue 11 Oct 14
2.2.2 EIA485 connections
This pair of adjacent RJ45 connectors, are located on the underside of the instrument, as shown in fi gures
2.1a and 2.1b . These connectors can be confi gured, by means of a 4-gang DIP switch each, as Master
or Slave. Further sections of the switches allow 120Ω terminating resistors to be switched in and out of
circuit. The DIP switches are accessible by removing the access cover at the rear of the unit.
Table 2.2.2a shows the pinout for master and slave connections. Figure 2.2.2 and table 2.2.2b show the
switch details for the small frame unit (large frame unit similar).
Table 2.2.2a Serial communication port pinout.
RxB
RxA
Common
NC
NC
Common
TxB
TxA TxB
TxA
Common
NC
NC
Common
RxB
RxA B
A
Common
NC
NC
Common
NC
NC
Pin
5 wire
Master
5 wire
Slave
3-Wire
Master/Slave
1
2
3
4
5
6
7
8
pin 1
pin 8
RJ 45 plug: View on underside
Figure 2.2.2b
Serial communications hardware confi guration
(Small frame shown - large frame similar)
Table 2.2.2b Communications DIP switch settings
ON 1234 ON 1234
BR2330
Ethernet
connector
Serial communications
ports
Port 1 Port 2
Cover retaining
screw location
120 Ohm terminating
resistor fitted across
pins 1 and 2
No terminating resistor
across pins 1 and 2
Segment
1
2
4
ON (left) OFF (right)
120 Ohm terminating
resistor fitted across
pins 7 and 8
No terminating resistor
across pins 7 and 8
Slave Master
3 5-wire 3-wire
LED INDICATORS
There are two LED indicators associated with the Serial Communications RJ45 connectors:
The yellow LED indicates when the unit is transmitting.
The green LED illuminates when 5-wire (full duplex) communications is selected (software selection).
CAUTION
The user must be at the same electrical
potential as the instrument housing when
accessing internal items such as batteries
and switches.