Pin
#
RS-232
1
Chassis Ground
2
Transmit Data (TxD) >
3
Receive Data (RD)
4
Request to Send (RTS) >
5
Clear to Send (CTS)
6
Data Set Ready (DSR) <
7
Signal Ground (SG)
8
Data Carrier Detect
(DCD)
9
10
11
12
13
14
15
Transmit Clock (TxC)
16
17
Receive Clock (RC)
18
19
20
Data Terminal Ready
(DTR)
21
22
23
24
Transmit Clock (TxC)
25
NOTE:
< indicates signal received by controller.
> indicates signal transmitted by controller.
A and B indicate polarity.
014–001867
Table C–3 VSC/3i Connector Signals
Electrical Interface
RS-530, RS-449, X.21
Shield
Transmit Data (TxD)
<
Receive Data (RD)
Request to Send (RTS) A >
<
Clear to Send (CTS)
Data Set Ready (DSR) A <
Signal Ground (SG)
Data Carrier Detect
<
(DCD)
Receive Clock (RC)
Data Carrier Detect
(DCD)
Transmit Clock (TxC) B >
Transmit Clock (TxC) B <
Clear to Send (CTS)
Transmit Data
<
Transmit Clock (TxC
Receive Data (RxD)
<
Receive Clock (RC)
Request to Send (RTS) B >
Data Terminal Ready
>
(DTR)
Data Set Ready (DSR) B <
Data Terminal Ready
(DTR)
>
Transmit Clock (TxC) A >
External Device Connector Pin Assignments
V.35
A
Shield
A >
Send Data (SD)
A <
Receive Data (RD)
Request to Send (RTS)
A <
Clear to Send (CTS)
Data Set Ready (DSR)
A
Signal Ground (SG)
Data Carrier Detect
A <
(DCD)
B <
Serial Clock Receive (SCR)
B <
Serial Clock Transmit
(SCTE)
Serial Clock Transmit
(SCT)
B <
B >
Send Data (SD)
A <
Serial Clock Transmit
(SCT)
B <
Receive Data (RxD)
A <
Serial Clock Receive (SCR)
Data Terminal Ready
A >
(DTR)
B >
Serial Clock Transmit
(SCTE)
A >
A <
>
<
<
<
B <
B >
<
B >
A <
B <
A <
>
A >
C-9
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