American Access Systems ProAccess 200sa - Manual (Page 26)

SK-ACP Installation & Operating Manual
SK-ACP OR 28SA-PLUS TROUBLE SHOOTING GUIDE
APPENDIX E
1.0 Erratic or No Communication Between Readers and PC
One of the most common problems with on-line systems is communications between reader stations and
the PC. There are two different configurations for connecting the PC to the network, through the RS-232
Gateway, or with a Converter. Select the configuration of your system from the list below and follow all the
troubleshooting steps listed in the appropriate section.
1. System Using the NET-CONV-P (RS 485 to RS232 converter).
a) See section 2.0
2. System Using the Reader Gateway (RS232 com port).
a) See section 3.0
2.0 System Using NET-CONV-P (RS232 to RS485 Converter)
2.1 Recommended Wiring
Check the following connections to the NET-CONV-P:
1. Cable Type: Belden 1585A or equivalent (2 twisted pair).
2. The SK-NM 485 module must be installed into each reader. (For 28SA-Plus only, SK-ACP has a
built-in 485 module).
3. Verify that both the brown and red wires from the SK-NM 485 module (s) are connected as a twisted pair.
4. Verify that the brown wire is connected to TD (A), and that TD (A) and RD (A) are jumpered together.
5. Verify that the red wire is connected to RD (B), and that RD (B) and TD (B) are jumpered together.
6. Verify that the black wire is connected using one conductor of the second pair, and then to the
converters GND or (-) side of the power supply.
7. Verify the converters power supply is connected to the 485 power input.
8. Verify JP1 is open (not jumpered), and JP2 is jumpered.
E-1