Product manual

Electrical Connections
31
CAD/PRINTER Connector
This port has three different functions based on the port configuration in the Serial Port
Configuration menu (see
Software Configuration Program) and the position of OPTION
SWITCH-7. If OPTION SWITCH-7 is in the On position, then this port is used to access
the Software Configuration Program with an RS-232 terminal. If OPTION SWITCH-7 is
in the Off position this port behaves as either a Data Logging interface or a CAD
interface depending on the selection made in the Serial Port Configuration menu (See
Appendix F: General Troubleshooting Guide on page 125). When a printer is interfaced
to the Model 26 for logging purposes, it must have a serial interface. The more common
parallel printers will not work with this port.
When a system is configured to support the use of both a primary and a backup Master
Model 26, the CAD/Printer port will be disabled for the two Model 26s with address 1
and 2 when they are in slave mode.
This voltage and current levels of this port are RS-232 compatible, its pin connections
may not be. The pin descriptions for this connector are as follows:
Pin Description
1
(NC)
Not Connected.
2
(NC/RxD)
Not Connected if JP12 is in Pos B, RxD if JP12 is in Pos A.
3
(TXD)
Data output
4
(RXD/DTR)
Receive Data input if JP12 is in Pos B, DTR (4.7kΩ to +12 Vdc) if JP12 is
in Pos A
5
(GND)
Connected to Model 26 chassis ground
6
(NC)
Not Connected
7
(RTS)
Request to Send output
8
(CTS)
Clear to Send input (will appear true if not connected)
9
(NC)
Not Connected