Northern UTA220/UTA220k - Manual (Page 153)

UTA220/UTA220k
D-5
Interfaces
EIA-366A
Requirements
The EIA-366 revision changed the function of pin 18 to receive
common. If an EIA-366A device will be connected to the port,
a special cable with the following connections must be used:
20 CD 108/
1,/2 Data Terminal
Ready (DTR) - (Not Used)
21 RL/CG 140/
110 Remote Loopback - (Not Used)
22 CE 125 Ring Indicator (RI) DLO Data Line Occupied
23 CH/CI 111/
112 (Not Used) - (Not Used)
24 CE 113 (Not Connected) - (Not Connected)
25 TM 142 Test Mode - (Not Used)
Table D-4: Ports 3 and 4 Pin Functions (Continued)
DB-
25 Pin
EIA-232/V.24 Mode EIA-366 Mode
EIA-
232E
Pin
V.24
Pin
Function EIA-
366
Pin
Function