Quatech MPAP-100 - Manual (Page 56)

* Not included in the official RS-232-D specification
Comm. Reg. bit 7 TM TEST MODE X 25
TRxCA pin DA TXCLK (DTE) X 24
N/C 23
PCMCIA STSCHG signal CE RING X 22
Comm. Reg. bit 4 RL RLBK X 21
DTR/REQA pin CD DTR X 20
N/C 19
Comm. Reg. bit 5 LL LLBK X 18
RTxCA pin DD RXCLK (DCE) X 17
N/C 16
TRxCA pin DB TXCLK (DCE) X 15
N/C 14
N/C 13
N/C 12
RTxCA or TRxCB pin * RXCLK (DTE) X 11
SYNCA pin * SYNCA X 10
N/C 9
DCDA pin CF CD X 8
AB DGND 7
DCDB pin CC DSR X 6
CTSA pin CB CTS X 5
RTSA pin CA RTS X 4
RxDA pin BB RXD X 3
TxDA pin BA TXD X 2
CGND 1
Table 17 --- Connector Pin Definitions
19.3 Null-modem cables
The MPAP-100 does not use a standard asynchronous PC serial port connector pinout.
Typical off-the-shelf null-modem cables cannot be used with this card!