Verification & Troubleshooting
26
Data Communications Module, 2nd Edition, 2/03
Corrective Action
Switch Settings & Port Pinouts
1.Check the master PLC source power.
2.Replace the D2–DCM.
1.Disconnect the master station PLC power,
remove the D2–DCM and check positions
1 & 2 on SW3.
1.Place the CPU in RUN mode.
2.Set the switch to the ON position.
3.Make sure the RX or WX instruction is
being executed. Check the address,
slot number, and amount and type of
data used in the RX/WX instructions.
1.Disconnect the PLC power, remove the
D2–DCM and check position 3 on SW3.
2.Remove master station connector,
ensure that RTS & CTS are connected
according to the cable diagram.
1.Check the address, slot number, and
amount and type of data used in the
RX/WX instructions.
2.Make sure baud rate, parity, and mode
(HEX/ASCII) match between the
master and slave.
3.Verify that the cable is wired properly.
1.Make sure baud rate, parity, and mode
(HEX/ASCII) match between the
master and slave.
2.Verify that the cable is wired properly.
Also, make sure slave is online.
1.Make sure baud rate, parity, and mode
(HEX/ASCII) match between the
master and slave.
1.Check the amount and type of data
being transferred. (Byte count may be
set to 1 or an odd number for a data
type that requires 2 bytes.)
2.Make sure baud rate, parity, and mode
(HEX/ASCII) match between the
master and slave.
1.Make sure the system has good earth
grounds. Only one end of the cable
shield must be grounded.
2.If you’re using RS232C, try RS422.
1.
Protocol
1
2
Direct
NET Slave
OFF OFF
Direct
NET Master
OFF
ON
Direct
NET Peer
ON OFF
MODBUS
RTU
ON
ON
Baud
1
2
3
300
ON
OFF OFF
600
OFF
ON
OFF
1200
ON
ON
OFF
2400
OFF OFF
ON
4800
ON
OFF
ON
9600
OFF
ON
ON
19200
ON
ON
ON
38400 OFF OFF OFF
Baud Rate
ODD Parity
Switch Positions
Self Test
NO Parity
Set to OFF
OFF ON
SW5
SW3
Network
Protocol
COM Timeout Disable
ASCII Mode
COM Timeout Enable
Hexadecimal Mode
1
2
3
4
5
6
7
8
1
2
3
4
Switch Positions
OFF ON
Time*
6
7
8
0
OFF OFF OFF
2
ON
OFF OFF
5
OFF
ON
OFF
10
ON
ON
OFF
20
OFF OFF
ON
50
ON
OFF
ON
100
OFF
ON
ON
500
ON
ON
ON
*Delay time in milliseconds
Switch Positions
Delay Time
Switch Settings
RS232C
RS232 TXD
RS232 RXD
RS232 RTS
RS232 CTS
0V
1
RS422*
0V
RS422 RTS–
RS422 TXD+
RS422 RXD–
RS422 CTS–
RS422 CTS+
RS422 RTS–
RS422 RTS+
RS422 TXD–
RS422 RXD+
RS422 TXD+
RS422 RXD–
RS422 TXD–
RS422 RXD+
RS422 RTS+
Port Pinouts
* RS422 pins are internally connected
+5V
+5V
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
2.
3.
4.
5.
6.
7.
8.
9.
Содержание D2-DCM
Страница 4: ...D2 DCM Data Communications Module Manual Number D2 DCM M...
Страница 37: ...1A Cable Diagrams...
Страница 47: ...Data Communications Module 2nd Edition 2 03 B RLL Communications Programs...
Страница 58: ...Data Communications Module 2nd Edition 2 03 C Using the D2 DCM with MODBUS...
Страница 67: ...Data Communications Module 2nd Edition 2 03 D Using the D2 DCM with Modems...
