JMI Telescopes MAX Computer - Manual (Page 14)

Page 14
Appendix B — NS/DS Catalog Abbreviations
AB Abell
AN Antalova
B Barnard
BA Basel
BD Baade
BI Biur
BK Berkley
BL Blanco
BO Bochum
CE Cederblad
CR Colinder
CZ Czernik
DD Dolidze-Dzimselejsvili
DO Dolidze
FR Frolov
GU Gum
H Harvard
HA Haffner
HB Hubble
HU Humason
KI King
LY Lynza MA Markarian
ME Melotte
MF Maffei
MK Minkowski
MR Merrill
NE New
PA Palomar
PI Pismis
RO Roslund
RU Ruprecht
SH2 Sharpless SP Stephenson
ST Stock
TO Tombaugh
TR Trumpler
TZ Terzian
U Upsala
VB Van Den Burgh
Appendix C — RS-232 Cable Assembly
The NGC-MAX computer unit has an RS-232 serial port which may be used to provide encoder position information to a
personal computer (PC). This can be used with the sample BASIC program provided in Appendix D, or with a commercial
software program which supports the NGC-MAX protocol (such as Software Bisque's T
HE S KY ™).
A special cable is required between the NGC-MAX and your PC. You may use the information here to assemble your own
cable, or you may purchase one from JMI. While a 12 foot (3.6m) cable is standard, a custom length may be special
ordered.
The connector at the NGC-MAX side of the cable is an RJ11 or RJ12 phone-type plug using the center four contacts.
Reference the following diagram when inserting the wires from a flat 4-conductor cable:
YEL GRN RED BLK
Wire insertion end of RJ11 or RJ12 male connector
The connector at the PC can be one of three varieties, depending upon your PC. Check the size of the PC's serial, or COM
port connector which you plan to use with the NGC-MAX. On IBM-compatible systems, it should be a 9 or 25 pin male
connector with two rows of pins. On Macintosh systems, it will be a round 8 pin female connector.
Once you have determined the proper connector, use the appropriate pinout below to complete the cable.
9-socket D-subminiature (female)
25-socket D-subminiature (female) 8-pin mini-DIN (male)
2 YEL TX 2 GRN RX 3 GRN RX
3 GRN RX 3 YEL TX 4 RED GRN
5 RED GND 7 RED GND 5 YEL TX
8 RED GND
Solder side of connectors
1 2 3 4 5
6 7 8 9 1 2 3 4 5 6 7 8 9 10 11 12 13
14 15 16 17 18 29 20 21 22 23 24 25
1 2
3 4 5
6 7 8