=[ x25-box.com ]=

APPENDIX A
Physical Interchange Circuits
ISO 2110       V.24 Circuit                                          Direction
pin number                                                           DTE DCE
RS-232-C
circuit
1      AA              Protective Ground                     (PGND)            1
2      BA      103     Transmitted Data                      (XMT)             2
3      BB      104     Received Data                         (RCV)             3
4      CA      105     Request To Send                       (RTS)             4
5      CB      106     Clear To Send                         (CTS)             5
6      CC      107     Data Set Ready                        (DSR)             6
7      AB      102     Signal Ground                         (GND)             7
8      CF      109     Data Carrier Detect                   (DCD)             8
9                                                                              9
10                                                                             10
11                                                                             11
12     SCF     122     Secondary Data Carrier Detect         (SDCD)            12
13     SCB     121     Secondary Clear To Send               (SCTS)            13
14     SBA     118     Secondary Transmitted Data            (SXMT)            14
15     DB      114     Transmit Signal Element Timing        (TSET-DCE)        15
16     SBB     119     Secondary Received Data               (SRCV)            16
17     DD      115     Receive Signal Element Timing         (RSET)            17
18             141     Local Loopback                        (L3)              18
19     SCA     120     Secondary Request To Send             (SRTS)            19
20     CD      108     Data Terminal Ready                   (DTR)             20
140     Remote Loopback                       (L2)              21
21     *
22     CE      125     Ring Indicator                        (RI)              22
23     CH      111     Data Signalling Rate Selector         (SEL)             23
24     DA      113     Transmit Signal Element Timing        (TSET-DTE)        24
25             142     Test Indicator                        (TI)              25
RS-232-C does not define circuits for loopback testing.
*
Pin 21 is used for Signal Quality Detector (CG).

НАЗАД