Chapter Three: Overview
Inside the Type 146 Unit
77
BCD Connector Pinout (Continued)
Pin Number
Assignment
12
Inverse of Status
2, 14
External Digital Ground
13
Digital Ground (Reserve)
1 and shell
Chassis Ground
15
D5 Volts (Reserved)
Table 31: BCD Board Pinout
The RS-232 Connector
Located on the rear panel is the standard, 9-pin male Type “D” connector that is used for serial
communications. Table 32 lists the pin functions employed by this interface. The RS-232
Communications chapter describes the RS-232 protocol used in the 146 unit.
RS-232 Connector Pinout and Cables
Pin Number
Assignment
2
TXD*
3
RXD*
5
Digital Ground
7
CTS*
Cable for AT
®
or compatible
CB-146-2, CB-146S-2
Cable for XT
®
or compatible
CB-146-4, CB-146S-4
* TXD =Transmit Data, RXD =Receive Data, CTS =Clear To Send
Table 32: RS-232 Connector Pinout and Cables
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