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iRIS 220 / iRIS 320, V1.19 User Guide
10 Appendix A – Radio Using the RS232 Interface
The iRIS may be used to communicate via external radios. For legacy radios requiring an audio interface, a
FSK modem such as the DS-IRM intelligent radio modem can be used. For radios fitted with an integral
modem, the iRIS connects directly to the radio’s RS232 port. The diagram below shows the typical cable
required to achieve either of these two modes of operation. The actual modem/radio connections may vary
depending on the type of device used.
In all cases, the DSR line from the modem or radio is used to enable the RS232 port and the RI line sets the
data rate to a fixed rate (normally 1200 bps).
Figure 13 – Typical RS232 / Data Radio Cable
Figure 14 – Typical RS232 / Radio Modem Cable
TXD (OUT) 3
RXD (IN) 2
0V (SIGNAL) 5
RTS (OUT) 7
CTS (IN) 8
WHITE
YELLOW
BLACK
BLUE
GREEN
RED
3 RXD (OUT)
2 TXD (IN)
7 OV (SIGNAL)
4 RTS (IN)
5 CTS (OUT)
iRIS 320
DB9 (F)
DS-IRM Modem
DB25 (M)
SCREEN
1 FRAME GND
RI (IN) 9
6 DSR (OUT)
DSR (IN) 6
AUX_RXD (IN) 3
AUX_TXD (OUT) 11
0V (SIGNAL) 15
GPIO4 BUSY (OUT) 10
+13V8 (OUT) 8
WHITE
YELLOW
BLACK
BLUE
RED
2 RXD (IN)
3 TXD (OUT)
5 OV (SIGNAL)
8 CTS (IN)
6 DSR (IN)
FRAME GND
Tait TM80xx Radio
DB15 (M)
(iRIS 3xx / DS-4483)
DB9 (F)
SCREEN
9 RI (IN)
10K
FLYING LEAD
TO DIG OUT
GPIO6 ENABLE (IN) 9
GREEN