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E-2 LEAD DEFINITIONS
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Table E-1. EIA RS-232C (V.28) LEADS/DEFINITIONS
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PIN EIA CCITT LEAD DESCRIPTION
NO. INTERCHANGE EQUIVALENT (FUNCTION)
CIRCUIT CIRCUIT
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1 AA 101 Protective Ground
2 BA 103 Transmitted Data
3 BB 104 Received Data
4 CA 105 Request to Send
5 CB 106 Clear to Send
6 CC 107 Data Set Ready
7 AB 102 Signal Ground/Common Ground
8 CF 109 Received Line Signal Detected
9 — — Reserved for Testing,
(+P) Transmit Current Loop Data
10 — — Reserved for Testing
11 SA — Supervisory Transmitted Data,
(–P) Transmit Current Loop Data
12 SCF 122 Secondary Received Line Signal
Detect—(Speed Mode Indication)
13 SCB 121 Secondary Clear to Send
14 SBA 118 Secondary Transmitted Data
15 DB 114 Transmit Signal Element Timing
16 SBB 119 Secondary Received Data
17 DD 115 Received Signal Element Timing
18 — — Normally Unassigned
CN Make Busy/Local Loopback
+ Receive Current Loop Data
19 SCA 120 Secondary Request to Send
20 CD 108/2 Data Terminal Ready
21 CG 110 Signal Quality Detector
RL 140 Remote Loopback
22 CH 111 Data Signal Rate Selector
CE 125 Ring Indicator
23 CI 112 Data Signal Rate Selector
CU Speed Select on Originate
24 DA 113 Transmitter Signal Element Timing
25 — — Normally Unassigned
CM Make Busy/Local Loopback
TM Test Mode
– Receive Current Loop Return
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