Page MSI-P563 User Manual
Table 4. The RS-232C connector (J3) pin-outs are described
in Table 5.
Table 4. Required jumpers for serial I/O.
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Mode JP3-1,2 JP3-3,4 JP3-5,6 JP6 I/O Connector
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RS-232C
No
No
No
Yes
J3
RS-422 *
No
No
Yes
No
J4
RS-485 **
Yes
Yes
No
No
J4
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* Line termination resistors R4 (Rx) and R5 (Tx) are inserted by installing
jumpers JP10-1 and JP10-2, respectively. (see schematic in Appendix).
** Transmit and receive modes are controlled by OUT1 of 16550 as
described in Section II.C.3. Line termination resistor R4 (Tx/Rx) is
inserted by installing jumper JP10-1.
Table 5. RS-232C connector J3 pin-outs.
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Pin No. Function Pin No. Function
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1
DCD
6
RX
2
TX
7
DTR
3
GND
8
DSR
4
RTS
9
CTS
5
RI
10
N/C
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1. RS-422 Selection.
The required jumpers for RS-422 operation are given in Table 4.
The RS-422 connector (J4) pin-outs are described in Table 6.
If line termination resistors are required, install jumper JP10-1 to
insert 120 Ohms across the transmitter output (TX) and JP10-2
for 120 Ohms across the receiver input (RX).
7
