2.5.2
COM 2 - RS-232
COM2 is I/O mapped at 2F8H and util izes a 16550-type UART con tained in the Super-
I/O chip. When used in RS- 232 mode COM2 is ter mi nated via the multi-I/O con nec tor at
J4.The con figu ra tion de tails and the pin defi ni tions when used with the CBL- 162-1 ca ble
are shown here :
2.5.3
RS-422 Mode Configuration
RS- 422 sig nal lev els are sup ported on ei ther, or both se rial chan nels with the
in stal la tion of the op tional “Chip Kit” Win Sys tems’ part number CK- 75176-2. This kit
pro vides the driver ICs nec es sary for a sig nal chan nel of RS- 422. If two chan nels of RS-
422 are re quired then two kits will be needed. RS- 422 is a 4- wire point- to- point full-
duplex in ter face al low ing much longer ca ble runs than are pos si ble with RS- 232. The
dif fer en tial trans mit ter and re ceiver twisted- pairs of fer a high de gree of noise im mu nity.
RS- 422 usu ally re quires that the lines be ter mi nated at both ends. The fol low ing
il lus tra tions show the cor rect jump er ing, driver IC in stal la tion, and I/O con nec tor pin
defi ni tions for each of the chan nels when used in RS- 422 mode.
2.5.4
COM 1 - RS-422
RS- 422 NOTE :
When used in RS- 422 mode, the trans mit ter must be en abled via
soft ware by set ting the RTS bit in the Mo dem Con trol Reg is ter (Bit 1).
Page 2-4
OPERATIONS MANUAL PCM-586
021402
WinSystems
- "The Embedded Systems Authority"
3
o
2
o
1
o
J8
U8 - Installed
U7 - Not Installed
U6 - Not Installed
COM2 - DB9
PIN DEFINITIONS
3
o
2
o
1
o
J10
1 DCD
2 RX Data
3 TX Data
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 RI
COM1 - DB9
PIN DEFINITIONS
U11 - Not Installed
U10 - Installed
U9 - Installed
3
o
2
o
1
o
J9
3
o
2
o
1
o
J11
1 N/A
2 TX+
3 TX-
4 N/A
5 GND
6 RX+
7 RX-
8 N/A
9 N/A
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