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E2261A Quad RS-232 Interface Wiring Information
Note: If you use the optional E2261-61601 cable, you must remove the cable hood if you install the E2261A in
either of the two internal slots of the E2251A Carrier. The figure on the next page shows the cable wiring for
making your own cable.
Serial Port 1
Serial Port 2
Serial Port 3
Serial Port 4
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HP E2261A Quad Serial M-Module
Pin Name and Function
Port 1
Pin #s
Port 2
Pin #s
Port 3
Pin #s
Port 4
Pin #s
9-Pin Connector
Pin #
DTR Data Terminal Ready 1 5 9 13 4
TD Transmitted Data 2 6 10 14 3
RD Received Data 3 7 11 15 2
RTS Request to Send 16 20 24 28 7
CTS Clear to Send 17 21 25 29 8
DSR Data Set Ready 18 22 26 30 6
SG Signal Ground 4, 8, 12, 19, 23, 27 5
Chassis Connection
a
31, 32, 33, . . . 43, 44 -
a. If you use a shielded cable, connect the shield to a chassis connector pin on the 44-pin
connector. Do not connect the other end of the shield.