User`s manual

Western Reserve Controls 1782-JDM User’s Manual
PUB 24.0
31
to use a DeviceNet software configuration tool. Many of these tools have EDS readers, which make
the editing process easier.
10. Does a 1782-JDMx gateway provide electrical isolation?
Yes, a 1782-JDMx gateway provides 1000V network electrical isolation.
11. What are the currently available 1782-JDMx gateway models?
1782-JDM-1: Isolated RS232 Interface
1782-JDM-2: Isolated RS485 Interface
1782-JDM-4: Isolated RS422 Interface
12. On what DeviceNet baud rates does the 1782-JDMx communicate?
The unit works with 125k, 250k or 500k baudrates. It is default set to autobaud on DeviceNet. A
fixed baudrate of 125k, 250k or 500k may also be assigned with a software configuration tool.
13. On what baud rates does the serial port communicate?
The serial port on the 1782-JDMx will communicate on baudrates of: 1200, 2400, 4800, 9600,
19.2k, or 38.4k baud.
14. How do I connect a 1782-JDMx gateway to a serial port device?
You connect the JDMx to a serial port Modbus device with the Phoenix connectors on the unit,
which are labeled for which signal goes in each port of the connector. For RS-232 or RS-485
communications the signal/pin assignments are as follows:
Pin # RS232
Signal
RS485
Signal
Designator
1 Receive Signal - SIG-
2 Transmit Signal + SIG+
3 Ground Ground GND
For RS-422 communications the signal/pin assignments are as follows:
Pin # Designator
RS422
Signal
5 TX- Transmit -
4 TX+ Transmit +
3 GND Ground
2 RX- Receive -
1 RX+ Receive +
15. How is the Master Handshake mode different from the Hardware handshake RTS/CTS?
Master Handshake mode is a data control mechanism between the DeviceNet master and the
1782-JDMx (after the JDMx receives data from serial device), communicated in IO message. The
1782-JDMx indicates new data arrival and waits for Master to issue a new record number, to be
used with new data. The hardware handshaking via RTS/CTS (which is not supported in the 1782-
JDMx) requires two additional signal lines on the serial side and it controls the data before it is
received.
16. When should I turn Pad Mode ON? Or what configuration parameter should I check when the
scanner cannot stay connected to the 1782-JDMx due to an IO size error?
If the DeviceNet scanner or the master device needs to be pre-configured with an input (produce)
size before making a connection, or if the serial device will be sending variable data size strings, you