Specifications

Technical description
DRYPOINT RA 80 – 720 29
5.17.5 REMOTE ALARM SIGNAL
A voltage free contact is provided for remote signalling the sum of any alarm condition of the dryer.
5.17.6 ACCESS CODE
A serviceman’s code is required to access level 2.
The manufacturer accepts no responsibility for damages due to the alteration of the operating parameters.
The password is specified in the last page of this manual.
The password must be kept by qualified personnel.
5.17.7 SERIAL COMMUNICATION
The DMC20 features an RS485 serial port (see terminal A and B on DMC20 back side) allowing the connection to a
network managed by a PC or PLC controller.
A maximum of 255 DMC20 units can be connected to the same network.
If a PC is used, the connection between the PC and the DMC20 network requires usage of an SBC485 interface
adaptor (can be purchased as accessory - see spare parts list) to convert the RS232 (PC) signal into an RS485
(DMS20) signal. The RS485 line is made of a two wire cable and can be up to max. 2000 meters long; for long distance
(exceeding 100m), it is advisable to use a shielded twisted pair polyethylene cable.
For good data transmission, it is imperative that at the cable end of the RS485 line a 120 ohm ¼ watt resistor is placed,
as shown in figure.
K
E S
set
RS 232
SBC 485
RS 48
5
A
B
P
E
R
I
P
H
E
R
A
L
N
o
.
1
120
K
E S
set
A
B
P
E
R
I
P
H
E
R
A
L
N
o
.
2
K
E S
set
A
B
P
E
R
I
P
H
E
R
A
L
N
o
.
2
5
5
CONNECTIONS
COM # PC
25 pin RS232
SBC485
25 pin RS232
SBC485
9 pin RS485
DMC20
DATA connector
Shield - pin 1 n.c. A - pin 1 A Terminal
Tx - pin 2 pin 2 B - pin 2 B Terminal
Rx - pin 3 pin 3 Shield - pin 4 n.c.
RTS - pin 4 pin 4
CTS - pin 5 pin 5
GND - pin 7 pin 7
PROTOCOL
The data flow between PC and SBC485 is controlled by an RTS signal. The protocol used for communication is a
subset of MODICON MODBUS 1 (MB1); functions 03 and 06 only are supported. Data are exchanged in ASCII mode
with the following format:
Baudrate : 9600 Data bit : 7 Stop bit : 1 Parity : even