Chapter 2 Installation 192.12 Serial ports (CN13, CN9)The PCM-4825/4825L offers two serial ports: one RS-232 and oneRS-232/422/485. These ports let you connect to serial devices (amouse, printers, etc.) or a communication network.2.12.1 COM1 RS-232 port (CN13)The serial port connectors are mounted on the bottom edge of thecard. The 9-pin, D-SUB connector to the left of the card is the RS-232 port.2.12.2 COM2 RS-232/422/485 selection (CN9)The secondary port located above COM1, consists of a 14-pin,dual-in-line, male header and can be configured to operate in RS-232, RS-422, or RS-485 mode. This is done via J7.Table 2-4: COM2 selection (J7)*RS-232 RS-422 RS-485J7* default settingThe IRQ and address range for both ports are fixed. However ifyou wish to disable the port or change these parameters later, youcan do this in the system BIOS setup. The table below shows thesettings for the PCM-4825/4825L board's ports.Table 2-5: PCM-4825/4825L Serial port default settingsPort Address Interrupt DefaultCOM1 3F8, 3E8 IRQ4 3F8COM2 2F8, 2E8 IRQ3 2F85 3 16 4 2 6 4 25 3 16 4 25 3 1
