All signals are named with respect to the originating unit.
All undesignated PINS are to be left open.
User must supply +12 VDC @ 125mA on PIN 9,-12 VDC @ 50mA on PIN 10 referenced to ground on PIN 7
for isolated RS232C operation. For isolated RS422 operation the user must supply +5 VDC @ 150mA on
PIN 9 referenced to ground on PIN 7.
5.4 HANDSHAKE OPTION
The controller digital communications includes provision for the full handshake operation for use in RS232C and
RS422 interfaces. To enable handshake for these interfaces, set the S2 switch number 4 "ON" (See Section 5.8).
Four signal leads are used.
Request to Send
Clear to Send
DATA Set Ready
PIN 20 DTR
Data Terminal Ready
The RS422 also requires return lines.
PIN 16 RTS
Request to Send Return
PIN 11 CTS
Clear to Send Return
PIN 25 DSR
Data Set Ready Return
Data Terminal Ready Return
The interface diagrams (Sections 5.5-5.7) shown are suggestions ONLY. There are several alternate wiring
configurations depending on the host. It is essential to compare the host or modem requirements with the PIN
designations before connecting the system.
If handshake is not required or if these signals are not compatible with the host computer, the S2 switch number 4
MUST be "OFF". Handshaking cannot be used for any 20 mA current loop interface or for drop line RS422
5.5 RS232C INTERFACE
RS232C HALF/FULL DUPLEX
ECLIPSE INSTRUMENTATION DIVISION