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34 Sun PCI High Speed Quad Port Serial Interface Adapter User’s Guide • May 2010
X.21 to RS-449 Converter
FIGURE B-3 illustrates the pin connections required for an X.21 to RS-449 converter.
FIGURE B-3 X.21 to RS-449 Converter
When using an X.21 conversion you must perform the following hsip_init
operation:
Note – Both receive and transmit clock inputs (RxC and TxCI) need a clock signal if
txc is set to txc and rxc is set to rxc.
# hsip_init hihp0 9600 txc=txc rxc=rxc
T(2,9)
S (6,13)
C (3,10)
R (4,11)
I (5,12)
G (8)
X.21 interface
TxD (4,22)
RxC (8,26)
RTS (7,25)
CTS (9,27)
RxD (6,24)
DCD (13,31)
SG (19)
RS-449 Interface
Workstation
TxCI (5,23)
(15 pin connector)
(37 Pin Connector)