MODEL 1000 SEP 2005
SUPPLEMENTAL WIRING GUIDE - SERIAL COMMUNICATIONS
A-3
DB-9 plug connections available for Serial Ports 1, 2, 5, 6, and 7.
Four of the serial ports, as noted in Table A-1, permit connection via a DB-9 plug.
PC-to-GC connections, direct serial: The GC serial ports were wired to appear as DCE, so a
'straight-through' serial cable is used, instead of a null-modem cable, for a direct serial
connection between the GC Controller and the PC. (The PC is Data Terminal Equipment, or
DTE.) See Section A.2.
External modem-to-GC connections, serial: A custom serial cable must be built to emulate
a null-modem cable for a connection between the GC Controller and an external modem.
(The modem is Data Communications Equipment, or DCE.) See Section A.3.
Both of the GC Controller's DB-9 jacks are female and have identical pin assignments.
(NOTE: A DB-9 male pin numbering scheme is also illustrated, but for reference purposes
only.)
pinout for both DB-9 female jacks at GC Controller
5
GND
4
DSR
3
RxD
2
TxD
1
RLSD
9
RI
8
RTS
7
CTS
6
DTR
Figure A-2. DB-9 Connector (P2, P3, P22, P23, and P24), and Pinout for Female Jacks
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