TM 5-3895-374-24-2955-257NOTES:1.All signals are named with respect to the originating unit.2.All undesignated PINS are to be left open.3.User must supply +12 VDC @ 125mA on PIN 9,-12 VDC @ 50mA on PIN 10 referenced to ground on PIN 7for isolated RS232C operation. For isolated RS422 operation the user must supply +5 VDC @ 150mA onPIN 9 referenced to ground on PIN 7.5.4 HANDSHAKEOPTIONThe controller digital communications includes provision for the full handshake operation for use in RS232C andRS422 interfaces. To enable handshake for these interfaces, set the S2 switch number 4 "ON" (See Section 5.8).Four signal leads are used.PIN 4RTSRequest to SendPIN 5CTSClear to SendPIN 6DSRDATA Set ReadyPIN 20 DTRData Terminal ReadyThe RS422 also requires return lines.PIN 16 RTSRequest to Send ReturnPIN 11 CTSClear to Send ReturnPIN 25 DSRData Set Ready ReturnPIN 8DTRData Terminal Ready ReturnThe interface diagrams (Sections 5.5-5.7) shown are suggestions ONLY. There are several alternate wiringconfigurations depending on the host. It is essential to compare the host or modem requirements with the PINdesignations before connecting the system.If handshake is not required or if these signals are not compatible with the host computer, the S2 switch number 4MUST be "OFF". Handshaking cannot be used for any 20 mA current loop interface or for drop line RS422configurations.5.5 RS232CINTERFACERS232C HALF/FULL DUPLEXWITHOUT HANDSHAKEECLIPSE INSTRUMENTATION DIVISIONpage 3-1106
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