20 Keysight 34921A-34925A User’s Guide34921A D-Sub ConnectorsBank 1For orientation, the D-sub connectorend of the module is facing you.Bank 2Bank 117L34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 5018 19 20 21 22 23 24 25 26 27 28 29 30 31 32 331 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17TSIL* 11H 11L 7H 7L 17H 13H 13L 9H 9L 19H 19L 15H 15L Interlock 1Interlock11H 1L 2H 2L 3H 3LCOM1HCOM1L 4H 4L 14H 14L 5H 5L 20H 20L18HGND 6H 6L 16H 16L 12H 12L 8H 8L 18L 10H 10L AMP41L AMP41I AMP42L AMP42I*TSIL = TemperatureSensor Interface Line.Provides thermocouplereference sensor serialoutput line to themainframe processor.50-PinD-Sub MaleConnectorDescription Pin Description Pin Description Pin Description Pin Description Pin1H 1 6H 35 11H 19 16H 37 COM1 H 71L 2 6L 36 11L 20 16L 38 COM1 L 82H 3 7H 21 12H 39 17H 23 Interlock 1 172L 4 7L 22 12L 40 17L 24 Interlock 1 333H 5 8H 41 13H 25 18H 43 GND 343L 6 8L 42 13L 26 18L 44 TSIL* 184H 9 9H 27 14H 11 19H 29 AMP 41L 474L 10 9L 28 14L 12 19L 30 AMP 41I 485H 13 10H 45 15H 31 20H 15 AMP 42L 495L 14 10L 46 15L 32 20L 16 AMP 42I 50WARNING As a safety feature, interlock 1 pins (17 and 33) on Bank 1 must be shorted toenable the Bank 1 Analog Bus relays to close. The optional 34921T terminalblock shorts these pins for you. This feature protects inadvertent routing ofhigh voltages from the Analog Bus to the D-sub connector of the module.