This article applies to TCG 01-E, TCG 02-E, TCG 01-G and TCG 02-G clocks configured as DCE.
The P4 DB9 connector outputs a programmable pulse signal and a serial string signal. Each of these signals are available simultaneously at RS-232 voltage levels and RS-422 (differential) voltage levels.
Pin 1 is a "programmable pulse" output at RS-232 levels.
Pins 4 and 6 are a differential pair for a "programmable pulse" output at RS-422 levels. This is the same output as pin 1.
Pin 2 is a serial string output at RS-232 levels, which can be configured for a variety of string formats (including time and date information).
Pins 8 and 9 are a differential pair for a serial string output at RS-422 levels. This is the same output as pin 2.