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EIA-232-D Lead Operation
The following description assumes single-stream operation which is the case when API is not
being used. Refer to the ISDN Application Programming Interface Programmer's Reference
Manual for more information on single-stream and autostream.
This section describes the assignments of the EIA-232-D leads.
Pin
2
To ADM
3
From ADM
4
To ADM
5
From ADM
6
From ADM
7
8
From ADM
20
To ADM
22
From ADM
Pin 2 — Transmitted Data (BA)
The ADM receives data from the attached data terminal at 98 to 101 percent of the selected
speed. The data from the attached terminal must have one start bit, eight information bits, and at
least one stop bit. The ADM ignores parity in the local mode (except for xon/xoff flow control)
and transports it transparently in the data mode. The ADM supports only ASCII-formatted
data in the local mode. The ADM recognizes a BREAK signal as 10 bits of spacing plus
20 milliseconds. The setting of the BREAK option governs the response of the ADM to break in
the data mode.
Pin 3 — Received Data (BB)
Signals on this circuit are generated by the ADM in response to data received from the remote
data equipment or to user commands from the data terminal. This circuit is held in the MARK
state when Received Line Signal Detect is OFF except for user testing and during the Local
Mode. The ADM transmits the BREAK signal as 200 milliseconds of SPACE.
Technical Information
TABLE 6-1
EIA-232-D Assignments
Interface to Attached Terminal
Direction
Transmitted Data
Received Data
Request-to-Send
Clear-to-Send
DCE Ready
Signal Ground
Received Line Signal Detector
DTE Ready
Ring Indicator
Function
EIA Circuit
Mnemonic
BA
BB
CA
CB
CC
AB
CF
CD
CE
Technical Information
6-1
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