User`s guide

DC 900-1317J 117
Appendix
A
Clock Signals
The ADCCP NRM communication interface is designed to use either externally or
internally generated clock signals. Clocking is selected through the clock source option
(Section 3.4.20.1 on page 70). The ADCCP NRM software always uses receive clocking
provided by the receive data source. Under external clocking, ADCCP NRM receives its
transmit clocks from the remote device. Under internal clocking, the transmit clock is
internally generated and also output to the remote device.
Ta ble A –1 defines the EIA-232 clock signals used by the ADCCP NRM software.
Tabl e A– 1: EIA-232 Clock Signals
Signal Pin Direction Description
XMT CLK 15 Input External clocking: transmit clock
Internal clocking: not used
RCV CLK 17 Input External clocking: receive clock
Internal clocking: receive clock
EXT CLK 24 Output External clocking: not used
Internal clocking: server-generated
Clock signal to be connected to the XMT
CLK of the local interface and the RCV
CLK pin of the remote interface.