User's Guide

Page 20
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HDLC Connector
The HDLC connector is an 8-way RJ48 socket used for connecting to a Mode 2 network computer. The
connector pin-out is detailed in Table 9.
External Speaker
The External Speaker connector is a 3.5 mm stereo jack used for connecting to an external speaker to
provide sidetone on the transceiver. This speaker should be a high impedance active type.
Table 9 HDLC Connector
Pin Signal Characteristic
1 HDLC RX A
(input)
RS422 differential synchronous data, 128 kbytes per second
±50 ppm.2 HDLC RX B
(input)
3 HDLC CL A
(output)
RS422 differential synchronous data, 128 kbytes per second
±50 ppm.
4 HDLC TX B
(output)
RS422 differential synchronous data, 128 kbytes per second
±50 ppm.5 HDLC TX A
(output)
6 HDLC CL B
(output)
RS422 differential synchronous data, 128 kbytes per second
±50 ppm.
7Ground 0 V.
8 Unregulated Supply
(output)
21.6 to 32 V, fused at 500 mA.
Table 10 External Speaker
Pin Signal Characteristic
Tip Speaker Drive (output) 0 to 3 V pk-pk. Connected directly to Ring.
Ring Speaker Drive (output) 0 to 3 V pk-pk. Connected directly to Tip.
Sleeve Ground 0 V.