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If provision is required for changing programs while the equipment is in operation, consideration should be given to the use
of locks or other means of assuring that only authorized personnel can make such changes.
These recommendations are intended as safeguards against the failure of critical components and the effects of such failures
or the inadvertent errors that might be introduced if programs are changed while the equipment is in operation.
The ICS 3-304.81 Safety Recommendations are reproduced by permission of the National Electrical
Manufacturers Association from NEMA ICS 3-304
2.3 Communications Connections
6
The ports as you look at the back of the case, are the ports for connecting to a PLC or some external
device (Controller Connectors).
2.3.1 Connector COM1 [RS232], COM2 [RS232]
1 5
Different cables are required for various devices. Restrict cable length to less than 500'
Cable
(150m) for RS485/422 devices and 50' (15m) for RS232 devices to avoid
Requirements
communications problems.
Caution
The COM light on the front of the MT-600/8000 will turn on with each Ethernet
communication. Shielded cable must be used for long lengths or cables run in an
electrically noisy environment.
Do not run cables next to AC power lines or near sources of electrical noise. Be sure
that the cable ends have been inserted all of the way into mating connectors and are
secure
Pin assignment of the 9 Pin, Male, SUB-D, COM1 [RS-232] and COM2 [RS-232] Port.
Pin Designations
COM1 [RS-232]
COM2 [RS-232]
2.3.2 Connector COM1[RS485] , COM3[RS485] and COM3[RS232]
The 9 Pin, Female, SUB-D, COM1 [RS-485], COM3 [RS-485] and COM3 [RS-232] Port on the back
of the unit is the RS-232 and RS485/422 communications port for connecting to a controller.
Connection
Pin Designations
COM1 [RS-485]
COM3 [RS-485]
COM3 [RS-232]
Pin#
Symbol
COM1 [RS232]
1
Not used
2
RxD
Received Data
3
TxD
Transmitted Data
4
TxD
5
GND
6
RxD
7
RTS
Ready to send output
8
CTS
Clear to send input
9
Not used
Pin assignment of the 9 Pin, Female, SUB-D COM1 [RS-485], COM3 [RS-485]
and COM3 [RS-232] Port. COM1 [RS485]2w supports MPI 187.5K.
Pin# Symbol Com1
[RS485]2w
1
Rx-
Data-
2
Rx+
Data+
3
Tx-
4
Tx+
5
GND
6
Data-
7
TxD
8
RxD
9
Data+
Signal Ground
Com1
Com3
[RS485]4w
[RS485]
Rx-
Rx+
Tx-
Tx+
Signal Ground
Data-
Data+
4
COM2 [RS232]
Transmitted Data
Received Data
Com3
[RS232]
Transmit
Receive
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