Interface rs-485, Connection way of the serial interface – CIRCUTOR DHB Series User Manual
Page 28
28
PrH1, PrH2,
PrH3, PrH4
4, 5, 6, 7
2000
dLY1, dLY2,
dLY3, dLY4,
4, 5, 6, 7
0
LEd1, LEd2,
LEd3, LEd4
4, 5, 6, 7
oFF
P_An
8
InP1
tYPA
8
0_10U
AnL
8
0
AnH
8
99999
bAud
8
19.2
prot
8
r8n1
Addr
8
1
SEt
9
no
SEC
9
0
HOUR
9
Not defined
unit
9
off
tESt
9
off
6. INTERFACE RS-485
DHB-424 programmable digital meters have serial links in RS-485 stan-
dards for the communication in computer systems and with other de-
vices fulfilling Master function. An asynchronous communication cha-
racter protocol MODBUS has been implemented on the serial link. The
transmission protocol describes ways of information between devices
through the serial link.
6.1. Connection Way of the Serial Interface
The RS-485 standard allows to a direct communication of 32 devices
on a single serial link of 1200 m long (at baud rate 9600 b/s). For the