Hytera RD988 - Page 85

Service Manual
82
abled will be dis
11 GND
12 DB26_GPIO
General I/O interface with function defined
through the CPS
2
13 pin (not defined) ACC_IO2 Accessory identification
14 IN Not defined PROM
15 IO3 ssory identification pin (not defined) ACC_ Acce
16 DB26_PTT_I
Programmable input pin (PTT by default) valid for
low level; configurable via CPS
N
17 GND
18 Not defined Pf_DET
19
When this pin is used for USB, USB of MMP10
will be disabled
D-
20 DB26_GPIO3
General I/O interface with function defined
uthro
g
h the CPS
21 GND
22 DB26_GPIO5
d
ough the CPS thr
General I/O interface with function define
23 DB26_GPIO
al input interface with function defined
rough the CPS
6
Gener
th
24 SlotA_Audio
tput of RX slot A 1. Audio ou
2. Select digital mode via the CPS
25 SlotB_Audio
2. Select digital mode via the CPS
1. Audio output of RX slot B
26 RSSI RSSI indication output (re ) served
Table 8-4 Expansion Interface (DB26)
DB9(J601) is used to r functions such as Program, Diagnose and Monitor, and has UART and USB
port . Its definition is described bel
Pin No.
Name
ealize
s ow:
Description
1 TX_PLL_CS2_DB9 SPI chip select, used to control PLL
2 TX_PLL_CLK_DB9 SPI clock, used to control PLL
3 TX/RX RS232 signal (default: TX)
4 TX_PLL_Data_DB9 LSPI data, used to control PL
5 RX/TX RS232 signal (default: RX)
6 , USB port V_BUS USB power supply