User`s manual

Western Reserve Controls 1782-JDM User’s Manual
PUB 24.0
32
will need to turn the PAD Mode ON. This parameter should be checked if the 1782-JDMx will not
stay connected due to an IO size error.
17. What should my master device logic be doing to see if new data is present in a poll message?
The Master program logic should be looking at the Receive Record Number and comparing it with
the last stored record number to monitor new data arrival in Immediate (Non-Handshake) Mode. In
the Master Handshake mode, the program should be looking at the New Data bit in status and if
detected, should supply the new record number and wait for the 1782-JDMx to produce data along
with that record number.
18. What does the 1782-JDMx gateway require for power?
The 1782-JDMx receives all necessary power from the DeviceNet network cable. This should be
between 11 and 25 Vdc. It consumes about 2 watts of power maximum.
19. How do I access the serial ASCII data from a 1782-JDMx gateway?
When configuring your PLC, you have the option to memory map the ASCII data from the 1782-
JDMx to a location on your PC. The ASCII data can be found at this location.
20. When do I need to use an EDS (electronic data sheet) file for a 1782-JDMx gateway?
An EDS file is not necessary, but it makes configuring the 1782-JDMx (changing baud rate,
framing, etc.) far easier than if you were to try to change the device parameters by editing the
attributes of certain class objects and instances without the aid of a configuration tool. There are
many software configuration tools available with EDS readers that can be used to set up the
device.
21. What is the proper cable to use for a 1782-JDMx gateway serial connection?
The proper cable selection depends upon which gateway model is used, the serial communication
baud rate desired and the total cable length. Cable selection guidelines:
1782-JDM-1: RS232 – 3-wire shielded
1782-JDC-2: RS485 – 3-wire shielded
1782-JDC-4: RS485/RS422 – 3-wire (RS485) shielded or 5-wire (RS422) shielded
22. Where can I purchase the proper cable for a 1782-JDMx gateway serial connection?
You can purchase the proper cable from many suppliers and fitted with the connectors required for
the gateway model and serial device being used.
If the answer to your question is not found here, or you require further assistance, please contact Western
Reserve Controls at:
1485 Exeter Road
Akron, OH 44306
330-733-6662 (phone)
330-733-6663 (fax)
For product information, e-mail: [e-mail]
For technical support, e-mail:
[e-mail]