2.5.8
COM 2 - RS-485
RS- 485 NOTE :
Be cause RS- 485 uses a sin gle twisted- pair, all trans mit ters are
con nected in par al lel. Only one sta tion may trans mit, or have its trans mit ter en abled at a
time. The trans mit ter en able/dis able is con trolled by Bit 1 in the Mo dem Con trol Reg is ter
(RTS). When set, the trans mit ter is en abled, when cleared (the nor mal state), the
trans mit ter is dis abled and the re ceiver is en abled. Note that it is nec es sary to al low some
mini mal set tling time af ter ena bling the trans mit ter bef ore trans mit ting the first
char ac ter. Like wise, fol low ing a trans mis sion, it is nec es sary to be sure that all
char ac ters have been com pletely shifted out of the UART (Check Bit 6 in the Line Status
Reg is ter) bef ore dis abling the trans mit ter to avoid chop ping off the last char ac ter sent.
2.6
Parallel Printer Interface
The PCM- 586 sup ports a stan dard par al lel printer port. An op tional con figu ra tion is
avail able with a par al lel port ca pa ble of en hanced EPP and ECP op era tions. The par al lel
port is I/O mapped at 278H and is ter mi nated at the Multi-I/O con nec tor J4. The pin
defi ni tions for the par al lel port con nec tor DB- 25, when used with the CBL- 162-1, ca ble is
shown be low :
Page 2-6
OPERATIONS MANUAL PCM-586
021402
WinSystems
- "The Embedded Systems Authority"
COM1 - DB9
PIN DEFINITIONS
U8 - Not Installed
U7 - Not Installed
U6 - Installed
3
o
2
o
1
o
J8
3
o
2
o
1
o
J10
Normal RS-485 operation is
achieved by jumpering J8 pins
1-2. For RS-485 with Echo-back
jumper pins 2-3
1 N/A
2 TX+/RX+
3 TX-/RX-
4 N/A
5 GND
6 N/C
7 N/C
8 N/A
9 N/A
1
o o
14
2
o o
15
3
o o
16
4
o o
17
5
o o
18
6
o o
19
7
o o
20
8
o o
21
9
o o
22
10
o o
23
11
o o
24
12
o o
25
13
o
STROBE
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
ACK
BUSY
PE
SLCT
AUTOFD
ERROR
INIT
SLIN
GND
GND
GND
GND
GND
GND
GND
GND
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