9
5
1
6
Figure B-3 Optional External PC Control Signals Connector (J4)
(Female 9 pin D-Sub)
Table B-3 Optional External PC Control Signals Connector (J4)
Pin #
Description
1
RS-232 Telephone OFF HOOK Signal
Hi = off hook, Low = on hook
2
RS-232 Control Signal to PC
Used to confirm controls from the Modem
3
RS-232 Control Signal from the PC
Used to control the Modem or other Equip. on Bus
4
RS-232 Control Signal for the “A / B” Switch
Hi = voice from the STE, Low = Data from the PC
transmitted to and received from the Modem Data Port
5 Ground
6 Not
Used
7
RS-232 Control Signal for the Alarm Horn
Hi = Horn On, Lo = Horn Off
The front panel alarm horn sounds continuously when
this signal is high.
8 Not
Used
9 Not
Used
20
