EX10-MAO32 (EX10*MAO32) Analog Output, 2 Ch, -10 to + 10 Vdc, 12 Bit. $530.00 | GCF611**S GCF611**S (GCF611--S) Communications Module, 1 ch, RS232C, ASCII. $1,160.00 | GCF612**S GCF612**S (GCF612--S) Communications Module, 2 ch RS232/RS485, ASCII/binary, fo $1,828.00 |