Parker
Hannifin
RS-232/RS-485 Communication Problems
If you cannot establish serial communication with the ACR90x0 controller,
use the information and procedures in this section to help isolate and resolve
problems. For more information, see “COM1 Connector” on pages 54 and 55
and “COM1 Connection” on pages 72 through 75.
COM1 Port Settings (RS-232 and RS-485)
The COM1 port supports the following characteristics for RS-232 and
RS-485 transmission:
•
1200, 2400, 4800, 9600, 19200, 38400 baud (The controller
automatically detects baud upon start-up.)
•
8 data bits
•
1 stop bit
•
No
parity
•
Xon/Xoff flow control
Physical Settings
Verify the physical settings for the COM1 port by following the steps in this
section.
1. Use the connector pinout in Table 60 to confirm that your cable and
mating connector are configured accurately for the COM1 port.
Signal
Pin
Signal
Pin
RX485
−
1
No connect
6
RX232/RX485+
2
Mode 0
7
TX232/TX485
−
3
No connect
8
TX485+
4
Mode 1
9
GND
5
Table 60 COM1 Connector Pinout
2. Confirm that mode pins 7 and 9 are assigned as indicated in Table 61
for proper RS-232 or RS-485 full-duplex operation.
COM1 Connector Pin
Interface
Pin 9 (Mode1)
Pin 7 (Mode 0)
RS-232
Open
Open
Reserved
Open
GND
Reserved
GND
Open
RS-485 full-duplex
GND
GND
Note:
The controller defaults to RS-232 operation
⎯
pins 7 and 9 set to
Open.
Table 61 COM1 Transmission Modes
Chapter 4 Troubleshooting 101
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Summary of Contents for ACR9000
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