Pinout of 10-pin berg connector on DLV11J (also MXV11A, KDJ11B CTY, perhaps KA630 and/or KD11Z CTYs too? Apparently not MicroVAX I.) 1 16x UART clock in or out (depending on whether jumpered to BRG) 2 signal ground 3 TxD+ 4 TxD- (ground, or reader pulse with 20mA adapter) 5 signal ground 6 key (pin missing) 7 RxD- 8 RxD+ 9 signal ground 10 +12VDC if fuse F1 installed (used for DTR or to power 20mA adapter) N.B. the receiver is differential, so pin 7 must be grounded for RS232C use.