Solution:

Serial Port Installation The POS-562/562L has a total of four on-board RS-232 serial ports, COM1-4. They are differentiated by COM1 and COM2 (RS-232/422/485) as primary serial ports and COM3 and COM4 as second-ary ports. All four serial ports have +5 V and +12 V power capabilities on both pin #1 and pin #9, depending on the jumper setting. Pin assignments for both internal and external COM ports can be found in the appendix. Primary serial ports (COM1: CN19/CN22, COM2:CN17/CN20) Each primary serial port has two connections, one external DB-9 and one internal 10-pin header giving the user the flexibility to adapt the board to many different systems. IRQ for COM1 and COM2 is fixed with COM1 on IRQ4 and COM2 on IRQ3. COM1 and COM2 can be enabled or disabled via BIOS . Secondary serial ports (COM3: CN18, COM4: CN15) The secondary serial ports each have one 10-pin, internally positioned header connection. The IRQ for COM3 is fixed at IRQ10 and COM4 is fixed at IRQ5. COM3 and COM4 can be enabled/disabled via BIOS. I. Jumpers Setting 1. COM2 RS-232/422/485 Selection(JP15, JP17 and JP18) Follow the jumper chart below to set the desired mode for COM2. 2. COM1 - COM4 RI pin +5/+12 V power setting (JP6,JP8, JP9, JP12) COM1 - COM4 can supply +/- 5V or +/- 1V power to the serial devices via RI pin of the COM port connector. The outputs of COM1 - COM4 RI pins are selected by setting JP6, JP8, JP9, JP12. II. BIOS Setup (page 49) 1. CMOS Setup If you wish to change the IRQ/IO address setting or disable/enable COM ports,you can modify it from "Integrated Peripheral"in CMOS setup. 2. COM1-COM4 IRQ and I/O Ports default setting The IRQ and the address range for COM1, 2, 3, 4 are fixed. However, if you wish to disable the port or change these parameters later you can do this in the system BIOS setup. The table below shows the settings for the POS-562/562L serial ports. III.